UNI Flanges

  • Size: 1/2″ thru 60″ or custom size.
  • Material: Nickel Alloy,Hastelloy Alloy,Monel Alloy,Inconel Allo, Anti-Corrosion Resistant Alloy, Super-Alloy, Duplex Steel, Stainless steel, Titanium Alloy, Copper Alloy, Carbon Steel, Aluminium Steel, ect.
  • Standard: A WWA C207, ASME B16.5, DIN, BS, JIS, EN1092-1, ASME B16.47 and GOST/ГОСТ Standard, etc..
  • Approved by CE, RoHs, SGS, BV
  • Large stock with different sizes

UNI Flanges Solutions

Discover high-quality UNI flanges and forgings that meet industrial requirements at UNI Flange Solutions. Our comprehensive line of flanges and forgings is designed to meet industry standards and ensure durability. Contact us today for custom solutions and superior service.

Table of Contents

Understanding your choice of UNI flanges options

UNI flanges are widely used in Europe, particularly in Italy. They come in several different options, which are suitable for various applications. Here are some of the most common options:

If you’re in the market for high-quality flanges,we offer a wide variety of flanges to suit your needs, including the popular UNI 2276, UNI 2277, UNI 2278, UNI 6080, UNI 6081, UNI 6082, UNI 6083, UNI 6084, UNI 6091, UNI 6092, UNI 6093, UNI 6094, UNI 6095, UNI 2253, UNI 2254, UNI 6088, UNI 6089, and UNI 6090 flanges.

When choosing UNI flanges, it’s important to consider the application and the pressure requirements. It’s also important to make sure that the flanges are compatible with the pipes and fittings being used.

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What are UNI flanges?

In pipeline and piping systems, UNI flanges are commonly used. The term “UNI” originates from “Unione Italiana,” meaning “Italian Union,” and these flanges are frequently used in Italy and other parts of Europe.
UNI flanges are a type of flange designed to connect two sections of pipe or equipment. They usually have a round shape with bolt holes around the edge to secure the flange to the adjacent section. The bolt holes are typically arranged in a circle and can be drilled or tapped. Uni flanges are available in various sizes and pressure ratings for multiple applications.
A distinctive feature of UNI flanges is their face-to-face dimensions. These dimensions are specific to UNI flanges and are used to ensure that the flanges can be connected appropriately. The face-to-face dimensions of UNI flanges are typically larger than other flanges and require more installation space. However, this larger size can make them more stable and durable than different flange types.

What are the different types of UNI flanges?

Flanges come in many different types and styles, but some common types of UNI flanges include:

Types of UNI flanges

The United Nations International (UNI) standard for flanges is widely recognized and used in many industries worldwide. UNI flanges come in different types, each with unique characteristics and applications. We introduce you to the most common types of UNI flanges, including weld neck flanges, Threaded flanges, Flat flanges, Lap joint flanges, Blind flanges, and Slip-on flanges.

  1. Weld neck flanges are widely used in high-pressure applications. The weld neck flange is designed to be welded to a pipe‘s end, which creates a smooth and robust connection that can withstand high pressure. This flange type is ideal for applications where the pipeline must withstand high temperatures, such as in the oil and gas industry.

  2. Threaded flanges are similar to weld neck flanges, but instead of being welded to the end of the pipe, they are screwed onto the pipe’s end. Threaded flanges are used for low-pressure applications and are easy to install and maintain. These flanges are commonly used in plumbing and small-scale industrial applications.

  3. Flat flanges, also known as plate flanges, are flat and thin, making them ideal for low-pressure applications where space is limited. They are easy to install and maintain and are commonly used in small-scale piping systems.

  4. Lap joint flanges are designed to be used with a lap joint stub end. The loose flange slides over the stub end and is bolted to the flange on the adjoining pipe or fitting. This flange type is used in applications where frequent dismantling is required, such as in pipelines that need to be cleaned regularly.

  5. Blind flanges, also known as blanking flanges, are used to seal off the end of a pipe. This flange is commonly used in the oil and gas industry to seal off a pipeline that is no longer used.

  6. Slip-on flanges are similar to flat flanges but have a slightly larger diameter and are designed to slide over the end of a pipe. They are then welded in place to create a strong and secure connection. Slip-on flanges are used in low-pressure applications and are commonly used in small-scale piping systems.

UNI flanges come in different types, each with unique characteristics and applications. Weld neck flanges are used in high-pressure applications, while threaded and flat flanges are used in low-pressure applications. Lap joint flanges are used in applications where frequent dismantling is required, and blind flanges are used to seal off the end of a pipe. Finally, slip-on flanges are used in low-pressure applications and are commonly used in small-scale piping systems. Understanding the different types of UNI flanges and their applications can help you choose the correct flange for your specific needs.

Advantages and disadvantages of UNI flanges

UNI flanges are a common type of flange used in various industrial applications. They are designed to connect pipes and other equipment and are known for their ability to withstand high pressures and temperatures. However, as with any additional equipment, UNI flanges have advantages and disadvantages. We discuss the pros and cons of UNI flanges so you can make an informed decision when selecting the correct flange for your application.

Advantages of UNI flanges

  • High-pressure resistance: UNI flanges are known to withstand high pressures. They are designed to provide a secure and tight seal between two pipes, which is critical for applications that require high pressure.

  • Temperature resistance: UNI flanges are also designed to withstand high temperatures. They are typically made of materials that can withstand high temperatures, making them ideal for high-temperature applications.

  • Versatility: UNI flanges are available in various sizes and configurations, making them suitable for multiple applications. They can be used to connect pipes of different sizes and in a variety of materials.

  • Easy to install: UNI flanges are relatively easy to install, saving you time and installation costs. They usually come with pre-drilled holes so they can easily be fixed to the equipment.

Disadvantages of UNI flanges

  • Cost: UNI flanges can be more expensive than other types of flanges. This is because they are designed to withstand high pressures and temperatures, which require them to be made of high-quality materials.

  • Maintenance: UNI flanges require regular maintenance to ensure they continue to work correctly. They must be checked regularly for signs of wear, and any damaged parts need to be replaced immediately.

  • Weight: UNI flanges can be heavy, making them difficult to handle during installation. This is especially true for larger flanges, which weigh several hundred pounds.

  • Limited availability: UNI flanges may only be available in some sizes and configurations, making it challenging to find the correct flange for your application.

UNI flanges are a popular choice for many industrial applications because of their high pressure and temperature resistance, versatility, and ease of installation. However, they have some drawbacks, including cost, maintenance requirements, weight and limited availability. When selecting a flange for your application, it is essential to weigh the advantages and disadvantages of UNI flanges against other types of flanges to determine which flange is best for your needs.

Flange Face Finish

Flange face finish is a crucial factor in ensuring proper sealing between flange connections. There are several types of flange face finishes available, each with its unique characteristics and benefits.
Types of Flange Face Finish
One type of flange face finish is the serrated finish. This finish is created by machining a series of grooves into the flange face, providing better grip and improved sealing when compressed. Serrated finishes are commonly used in applications where the flange connection may be subject to vibration or movement.
Another type of flange face finish is the stock finish. This is the default finish provided by the manufacturer, and it typically has a smooth surface. While it may not offer the same grip as a serrated finish, a stock finish is suitable for many standard applications.

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Spiral serrated finishes feature a spiral pattern of grooves that helps to distribute stress evenly across the flange face. This can help to prevent damage and distortion, which can lead to leaks or other issues.

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Concentric serrated finishes are similar to spiral serrated finishes but feature a series of concentric rings around the flange face. This pattern can provide enhanced sealing and grip compared to other types of serrated finishes.

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Finally, a smooth finish is another option for flange face finish. Smooth finishes are often used in applications where the flange connection is not subject to significant movement or vibration. While it may not offer the same grip as a serrated finish, a smooth finish can still provide a reliable seal in many standard applications.

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For example:

Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 – 6.3 micrometer (= 125 – 250 microinches AARH)

  • AARH stands for Arithmetic Average Roughness Height. It is used to measure the roughness (rather smoothness) of surfaces. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface.
  • 63 AARH is specified for Ring Type Joints.
  • 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets.
  • 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. If we use smooth finish for soft gaskets enough “biting effect” will not occur and hence the joint may develop leak.
  • Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same.

Selecting the appropriate flange face finish is essential to ensuring a proper seal between flange connections. Whether you choose a serrated finish, stock finish, spiral serrated, concentric serrated, or smooth finish, it is important to consider the specific application and potential stresses that the flange connection may face. By selecting the right finish for the job, you can help to prevent leaks and other issues that can lead to costly downtime and repairs.

Standard Specication For UNI Flanges

  • Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, UNI, ASA, API-605, AWWA, Custom Drawings
  • Size : 1/2″ (15 NB) to 48″ (1200NB)
  • Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
  • DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629,
  • DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673
  • BS : BS4504 , BS4504, BS1560, BS10
  • Flange Face Type : Flate Face (FF), Raised Face(RF), Ring Type Joint (RTJ)

Material of UNI Flanges

The selection of materials for UNI Flanges typically varies according to the specific application and desired properties. Carbon steel, stainless steel, cast iron, brass, and aluminum are common materials used for manufacturing UNI Flanges. The selection process usually considers factors like temperature, pressure, the corrosiveness of the fluid or gas being conveyed, and any applicable regulatory requirements or industry standards. Therefore, some of the materials commonly utilized for UNI flanges comprise:

Stainless Steel UNI Flange ASTM/ASME A/SA182:- F304, F304L, F316, F316L, ASTM/ASME A/SA351:- CF3, CF3M, CF8, CF8M, DIN 1.4306, DIN 1.4301, DIN 1.4404, DIN 1.4401, DIN 1.4408, DIN 1.4308, DIN 1.4306, DIN 1.4409
Duplex UNI Flange S31803 / S32205 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex UNI Flange S32750 / S32760 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Copper Nickel UNI Flange ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Titanium UNI Flange ASTM B381 / ASME SB381:- Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7, ASTM R50250/GR.1|R50400/GR.2|R50550/GR.3|R50700/GR.4|GR.6|R52400/GR.7| R53400/GR.12|R56320/GR.9| R56400/GR.5
Copper UNI Flange TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000, C12200, C12300, T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910, C10920, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Incoloy UNI Flange ASTM B564 / ASME SB564:- Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
Inconel UNI Flange ASTM B564 / ASME SB564:- Inconel 600, 601, 625, 718, 783, 690, x750
Nickel UNI Flange ASTM B564 / ASME SB564:- Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Hastelloy UNI Flange ASTM B564 / ASME SB564:- Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel UNI Flange ASTM B564 / ASME SB564:- Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Carbon Steel UNI Flange ASTM/ASME A/SA105 A/SA105N and A/SA216-WCB, DIN 1.0460, DIN 1.0402, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, CS High Yield ASTM A694 / A694 (F52, F56, F60, F65, F70, F80)
Alloy Steel UNI Flange ASTM A182 / ASME SA182:- F5, F9, F11, F12, F22, F91
Alloy 20 UNI Flange ASTM B462 / ASME SB462:- Carpenter 20 Alloy, Alloy 20Cb-3
254 SMO UNI Flange ASTM A182 / ASME SA182:- SMO 254/6Mo, UNS S31254, DIN 1.4547
Aluminium UNI Flange 5052 /6061/ 6063 / 2017 / 7075 / etc.
Brass UNI Flange 3602 / 2604 / H59 / H62 / etc.
Other UNI Flange material Tin bronze, Alumunum bronze, Lead bronze, Nimonic 75, Nimonic 80A, Nimonic 90, AISI 4140, AISI 4130, Mild Steel, Al6XN

Size of UNI Flanges

The size of UNI flanges depends on the expected pipe diameter, with standard sizes typically ranging from DN15 (15 mm or 1/2 inch) to DN600 (600 mm or 24 inches). While larger UNI flanges can be manufactured, such custom fabrication is not standard. It is important to select the proper UNI flange size to ensure a secure connection and avoid leaks.

Dimensions of UNI Flanges

The most commonly used flange types in UNI standards include UNI 2276 PN6, UNI 2277 PN10, UNI 2278 PN16, UNI6083 PN25, UNI 6084 PN40, and UNI 6089 PN6-PN100. Each flange type has standard dimensions; some of the common ones include the following:

  • Outside diameter (OD): The overall dimension of the flange, which is the outside diameter of the flange.

  • Bolt Circle Diameter (BCD): The circle’s diameter that holds the bolt in place.

  • Several bolt holes: The number of bolt holes in the flange.

  • Bolt hole diameter: The diameter of the bolt hole.

  • Thickness: The thickness of the flange.

The exact dimensions of each UNI flange type can be found in the UNI standard, but these dimensions may vary depending on the flange’s specific size and pressure class.

The exact dimensions of each UNI flange type can be found in the UNI standard, but these dimensions may vary depending on the flange’s specific size and pressure class.

Dimensions of UNI plate flange

UNI 2276 plate flange PN6

20230217060635 23235 - UNI Flanges

ITALIAN STANDARDS UNI 2276 PLATE FLANGE PN 6
Directions for the designation d1 a b D f Holes Screws Weight*
Rated Diameter External diameter of the pipe Nominal Tolerance Kg
15 20 20,5 +0,5 55 10 80 11 4 M 10 0,34
21,3 22 0,33
20 25 25,5 65 12 90 11 4 M 10 0,51
26,9 27,5 0,50
25 30 30,5 75 12 100 11 4 M 10 0,63
33,7 34 0,61
32 38 38,5 90 14 120 14 4 M 12 1,09
42,4 43 1,05
40 44,5 45 100 14 130 14 4 M 12 1,26
48,3 49 1,23
50 57 58 110 14 140 14 4 M 12 1,38
60,3 61,5 1,35
65 76,1 77 130 14 160 14 4 M 12 1,68
80 88,9 90 150 16 190 18 4 M 16 2,63
100 108 109 +1,0 170 16 210 18 4*** M 16 3,05
114,3 115,5 2,92
125 133 134,5 200 18 240 18 8 M 16 4,11
139,7 141 3,90
150 159 160,5 225 20 265 18 8 M 16 5,16
168,3 170 4,78
175 193,7 195,5 255 22 295 18 8 M 16 6,27
200 219,1 221 280 22 320 18 8 M 16 6,91
250 267 269 335 24 375 18 12 M 16 9,53
273 275 9,04
300 323,9 326 395 24 440 22 12 M 20 12,1
350 355,6 358 445 26 490 22 12 M 20 17,0
368 370,5 15,6
400 406,4 409 +1,5 495 28 540 22 16 M 20 20,1
419 422 18,3
450 457,2 460,2 ±5 550 28 595 22 16 M 20 25,8
500 508 511 600 30 645 22 20 M 20 30,0
600 609,6 612,6 705 30 755 25 20 M 22 37,9
700 711,2 714,2 810 32 860 25 24 M 22 47,9
800 812,8 815,8 920 34 975 30 24 M 27 62,9
900 914,4 917,4 1020 36 1075 30 24 M 27 74,6
1000 1016 1019 1120 36 1175 30 28 M 27 81,9
* The weight is approximate and calculated on base 7.85 Kg/dm3
** Raw hole to be worked again according to the real external diameter of the pipe
*** For oil piping the flange should have 8 holes

UNI 2277 plate flange PN10

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ITALIAN STANDARDS UNI 2277 PLATE FLANGE PN 10
Directions for the designation d1 a b D f Holes screws Weight*
Rated Diameter External diameter of the pipe Nominal Tolerance Kg
15 20 20,5 +0,5 65 12 95 14 4 M 12 0,67
21,3 22 0,66
20 25 25,5 75 14 105 14 4 M 12 0,83
26,9 27,5 0,82
25 30 30,5 85 14 115 14 4 M 12 1,03
33,7 34 1,01
32 38 38,5 100 16 140 18 4 M 16 1,66
42,4 43 1,63
40 44,5 45 110 16 150 18 4 M 16 1,89
48,3 49 1,85
50 57 58 125 18 165 18 4 M 16 2,51
60,3 61,5 2,46
65 76,1 77 145 18 185 18 4 M 16 3,00
80 88,9 90 160 20 200 18 4 M 16 3,61
100 108 109 +1,0 180 22 220 18 8 M 16 4,60
114,3 115,5 4,40
125 133 134,5 210 24 250 18 8 M 16 6,19
139,7 141 5,92
150 159 160,5 240 24 285 22 8 M 20 7,63
168,3 170 7,17
175 193,7 195,5 270 26 315 22 8 M 20 9,16
200 219,1 221 295 26 340 22 8 M 20 10,1
250 267 269 350 28 395 22 12 M 20 13,4
273 275 12,9
300 323,9 326 400 28 445 22 12 M 22 14,8
350 355,6 358 460 30 505 22 16 M 20 22,0
368 370,5 20,4
400 406,4 409 +1,5 515 32 565 25 16 M 22 28,0
419 422 25,9
450 457,2 460,2 ±5 565 32 615 25 20 M 22 33,3
500 508 511 620 34 670 25 20 M 22 40,3
600 609,6 612,6 725 36 780 30 20 M 27 53,0
* The weight is approximate and calculated on base 7.85 Kg/dm3

UNI 2278 plate flange PN16

20230217065136 32720 - UNI Flanges

ITALIAN STANDARDS UNI 2278 PLATE FLANGE PN 16
Directions for the designation d1 a b D f Holes screws Weight* Kg
Rated Diameter External diameter of the pipe Nominal Tolerance
15 20 20,5 +0,5 65 12 95 14 4 M 12 0,67
21,3 22 0,66
20 25 25,5 75 14 105 14 4 M 12 0,83
26,9 27,5 0,82
25 30 30,5 85 14 115 14 4 M 12 1,03
33,7 34 1,01
32 38 38,5 100 16 140 18 4 M 16 1,66
42,4 43 1,63
40 44,5 45 110 16 150 18 4 M 16 1,89
48,3 49 1,85
50 57 58 125 18 165 18 4 M 16 2,51
60,3 61,5 2,46
65 76,1 77 145 18 185 18 4 M 16 3,00
80 88,9 90 160 20 200 18 8** M 16 3,61
100 108 109 +1,0 180 22 220 18 8 M 16 4,60
114,3 115,5 4,40
125 133 134,5 210 24 250 18 8 M 16 6,19
139,7 141 5,92
150 159 160,5 240 24 285 22 8 M 20 7,63
168,3 170 7,17
175 193,7 195,5 270 26 315 22 8 M 20 9,16
200 219,1 221 295 26 340 22 12 M 20 9,77
250 267 269 355 32 405 25 12 M 22 16,6
273 275 16,0
300 323,9 326 410 32 460 25 12 M 22 19,3
350 355,6 358 470 36 520 25 16 M 22 29,4
368 370,5 27,3
400 406,4 409 +1,5 525 38 580 30 16 M 27 36,5
419 422 33,9
* The weight is approximate and calculated on base 7.85 Kg/dm3
** For PN10 the flange should have 4 holes

Dimensions of UNI weld neck flanges

UNI 2280 weld neck flange PN6

20230217065515 89362 - UNI Flanges

ITALIAN STANDARDS UNI 2280 WELD NECK FLANGE RF PN 6
Directions for the designation d1 a b D f h h1 m r s Holes Screws Weight* Kg
Rated Diameter External diameter of the pipe
15 20 21 55 12 80 11 30 6 28 4 2,5 4 M 10 0,45
21,3 22,5 30 0,45
20 25 26 65 14 90 11 32 6 35 4 2,5 4 M 10 0,66
26,9 28 38 0,66
25 30 31 75 14 100 11 35 6 40 4 2,8 4 M 10 0,83
33,7 34,5 42 0,82
32 38 39 90 14 120 14 35 6 50 6 3 4 M 12 1,18
42,4 43,5 55 1,16
40 44,5 45,5 100 14 130 14 38 7 58 6 3 4 M 12 1,40
48,3 49,5 62 1,38
50 57 58 110 14 140 14 38 8 70 6 3,5 4 M 12 1,58
60,3 61,5 74 1,56
65 76,1 77 130 14 160 14 38 9 88 6 3,5 4 M 12 1,95
80 88,9 90 150 16 190 18 42 10 102 8 3,7 4 M 16 3,07
100 108 109 170 16 210 18 45 10 122 8 3,7 4** M 16 3,68
114,3 115,5 130 3,56
125 133 134 200 18 240 18 48 10 148 8 4 8 M 16 5,04
139,7 141 155 4,80
150 159 161 225 18 265 18 48 12 172 10 5 8 M 16 5,75
168,3 170,5 184 5,52
175 193,7 195,5 255 20 295 18 52 12 208 10 5 8 M 16 7,22
200 219,1 221 280 20 320 18 55 15 236 10 5 8 M 16 8,16
250 267 269 335 22 375 18 60 15 282 12 5,5 12 M 16 11,4
273 275 290 11,1
300 323,9 326 395 22 440 22 62 15 342 12 6 12 M 20 14,8
350 355,6 357,5 445 22 490 22 62 15 385 12 6,5 12 M 20 19,5
368 370 17,7
400 406,4 408,5 495 22 540 22 65 15 438 12 7 16 M 20 22,5
419 421 20,3
450 457,2 459 550 22 595 22 65 15 476 12 7,3 16 M 20 25,0
500 508 510 600 24 645 22 68 15 538 12 7,3 20 M 20 30,4
600 609,6 611,5 705 24 755 25 70 16 640 12 7,3 20 M 22 38,0
700 711,2 715 810 24 860 25 70 16 740 12 9 24 M 22 45,9
800 812,8 817 920 24 975 30 70 16 842 12 9 24 M 27 55,0
900 914,4 918 1020 26 1075 30 70 16 942 12 9 24 M 27 64,7
1000 1016 1020 1120 26 1175 30 70 16 1045 16 9 28 M 27 70,6
1200 1220 1224 1340 28 1405 33 90 20 1248 16 9 32 M 30 108
1400 1420 1424 1560 32 1630 36 90 20 1452 16 9 36 M 33 153
1600 1620 1624 1760 34 1830 36 90 20 1655 16 11 40 M 33 189
1800 1820 1824 1970 36 2045 39 100 20 1855 16 11 44 M 36 x 3 239
2000 2020 2024 2180 38 2265 42 110 25 2058 16 12 48 M 39 x 3 308
* The weight is approximate and calculated on base 7.85 Kg/dm3
** For oil piping the flange should have 8 holes

UNI 2281 weld neck flange PN10

20230217065515 89362 - UNI Flanges

ITALIAN STANDARDS UNI 2281 WELD NECK FLANGE RF PN 10
Directions for the designation d1 a b D f h h1 m r s Holes Screws Weight*
Rated Diameter External diameter of the pipe Kg
15 20 21 65 14 95 14 35 6 30 4 2,5 4 M 12 0,73
21,3 22,5 32 0,73
20 25 26 75 16 105 14 38 6 38 4 2,5 4 M 12 1,03
26,9 28 40 1,03
25 30 31 85 16 115 14 38 6 42 4 2,8 4 M 12 1,24
33,7 34,5 45 1,23
32 38 39 100 16 140 18 40 6 52 6 3 4 M 16 1,82
42,4 43,5 56 1,80
40 44,5 45,5 110 16 150 18 42 7 60 6 3 4 M 16 2,10
48,3 49,5 64 2,08
50 57 58 125 18 165 18 45 8 72 6 3,5 4 M 16 2,81
60,3 61,5 75 2,78
65 76,1 77 145 18 185 18 45 10 90 6 3,5 4 M 16 3,40
80 88,9 90 160 20 200 18 50 10 105 8 3,7 8** M 16 4,20
100 108 109 180 20 220 18 52 12 125 8 3,7 8 M 16 4,90
114,3 115,5 131 4,75
125 133 134 210 22 250 18 55 12 150 8 4 8 M 16 6,70
139,7 141 156 6,45
150 159 161 240 22 285 22 55 12 175 10 5 8 M 20 8,30
168,3 170,5 184 8,00
175 193,7 195,5 270 24 315 22 60 12 210 10 5 8 M 20 10,3
200 219,1 221 295 24 340 22 62 16 235 10 5 8 M 20 11,4
250 267 269 350 26 395 22 68 16 285 12 5,5 12 M 20 15,6
273 275 292 15,2
300 323,9 326 400 26 445 22 68 16 344 12 6 12 M 20 18,0
350 355,6 357,5 460 26 505 22 68 16 385 12 6,4 16 M 20 24,5
368 370 22,5
400 406,4 408,5 515 26 565 25 72 16 440 12 7 16 M 22 30,2
419 421 27,8
450 457,2 459 565 26 615 25 72 16 478 12 7,3 20 M 22 32,3
500 508 510 620 28 670 25 75 16 542 12 7,3 20 M 22 40,4
600 609,6 611,5 725 28 780 30 80 18 642 12 7,3 20 M 27 50,0
700 711,2 715 840 30 895 30 80 18 745 12 9 24 M 27 66,4
800 812,8 817 950 32 1015 33 90 18 850 12 9 24 M 30 89,3
900 914,4 918 1050 34 1115 33 95 20 950 12 9 28 M 30 104
1000 1016 1020 1160 34 1230 36 95 20 1052 16 9 28 M 33 121
1200 1220 1224 1380 38 1455 39 115 25 1255 16 10 32 M 36 x 3 180
1400 1420 1424 1590 42 1675 42 120 25 1460 16 11 36 M 39 x 3 248
1600 1620 1624 1820 46 1915 48 130 25 1665 16 12 40 M 45 x 3 352
1800 1820 1824 2020 50 2115 48 140 30 1868 16 13 44 M 45 x 3 433
2000 2020 2024 2230 54 2325 48 150 30 2072 16 14 48 M 45 x 3 543
* The weight is approximate and calculated on base 7.85 Kg/dm3
** For PN10 the flange should have 4 holes

UNI 2282 weld neck flange PN16

20230217065515 89362 - UNI Flanges

ITALIAN STANDARDS UNI 2282 WELD NECK FLANGE RF PN 16
Directions for the designation d1 a b D f h h1 m r s Holes Screws Weight*
Rated Diameter External diameter of the pipe Kg
15 20 21 65 14 95 14 35 6 30 4 2,5 4 M 12 0,73
21,3 22,5 32 0,73
20 25 26 75 16 105 14 38 6 38 4 2,5 4 M 12 1,03
26,9 28 40 1,03
25 30 31 85 16 115 14 38 6 42 4 2,8 4 M 12 1,24
33,7 34,5 45 1,23
32 38 39 100 16 140 18 40 6 52 6 3 4 M 16 1,82
42,4 43,5 56 1,80
40 44,5 45,5 110 16 150 18 42 7 60 6 3 4 M 16 2,10
48,3 49,5 64 2,08
50 57 58 125 18 165 18 45 8 72 6 3,5 4 M 16 2,81
60,3 61,5 75 2,78
65 76,1 77 145 18 185 18 45 10 90 6 3,5 4 M 16 3,40
80 88,9 90 160 20 200 18 50 10 105 8 3,7 8** M 16 4,20
100 108 109 180 20 220 18 52 12 125 8 3,7 8 M 16 4,90
114,3 115,5 131 4,75
125 133 134 210 22 250 18 55 12 150 8 4 8 M 16 6,70
139,7 141 156 6,45
150 159 161 240 22 285 22 55 12 175 10 5 8 M 20 8,30
168,3 170,5 184 8,00
175 193,7 195,5 270 24 315 22 60 12 210 10 5 8 M 20 10,3
200 219,1 221 295 24 340 22 62 16 235 10 5 12 M 20 11,1
250 267 269 355 26 405 25 70 16 285 12 5,5 12 M 22 16,7
273 275 292 16,3
300 323,9 326 410 28 460 25 78 16 344 12 6 12 M 22 21,8
350 355,6 357,5 470 30 520 25 82 16 390 12 6,4 16 M 22 31,7
368 370 29,2
400 406,4 408,5 525 32 580 30 85 16 445 12 7 16 M 27 38,3
419 421 37,0
450 457,2 459 585 32 640 30 85 16 485 12 7,3 20 M 27 45,4
500 508 510 650 34 715 33 90 16 548 12 7,3 20 M 30 61,1
600 609,6 611,5 770 36 840 36 95 18 652 12 7,3 20 M 33 84,6
700 711,2 715 840 36 910 39 100 18 755 12 9 24 M 33 87,4
800 812,8 817 950 38 1025 39 105 20 855 12 9 24 M 36 x 3 109
900 914,4 918 1050 40 1125 42 110 20 955 12 10 28 M 36 x 3 129
1000 1016 1020 1170 42 1255 48 120 22 1058 16 12 28 M 39 x 3 175
1200 1220 1224 1390 48 1485 48 130 30 1262 16 14 32 M 45 x 3 257
1400 1420 1424 1590 52 1685 48 145 30 1465 16 16 36 M 45 x 3 337
1600 1620 1624 1820 58 1930 56 160 35 1668 16 17 40 M 52 x 3 481
1800 1820 1824 2020 62 2130 56 170 35 1870 16 19 44 M 52 x 3 591
2000 2020 2024 2230 66 2345 62 180 40 2072 16 21 48 M 56 x 4 727
* The weight is approximate and calculated on base 7.85 Kg/dm3
** For PN10 the flange should have 4 holes

UNI 2283 weld neck flange PN25

20230217065515 89362 - UNI Flanges

ITALIAN STANDARDS UNI 2283 WELD NECK FLANGE RF PN 25
Directions for the designation d1 a b D f h h1 m r s Holes Screws Weight*
Rated Diameter External diameter of the pipe Kg
15 20 21 65 16 95 14 38 6 30 4 2,5 4 M 12 0,83
21,3 22,5 32 0,83
20 25 26 75 18 105 14 40 6 38 4 2,5 4 M 12 1,15
26,9 28 40 1,15
25 30 31 85 18 115 14 40 6 42 4 2,8 4 M 12 1,39
33,7 34,5 46 1,38
32 38 39 100 18 140 18 42 6 52 6 3 4 M 16 2,03
42,4 43,5 56 2,01
40 44,5 45,5 110 18 150 18 45 7 60 6 3 4 M 16 2,35
48,3 49,5 64 2,33
50 57 58 125 20 165 18 48 8 72 6 3,5 4 M 16 3,11
60,3 61,5 75 3.08
65 76,1 77 145 22 185 18 52 10 90 6 3,5 8 M 16 3,95
80 88,9 90 160 24 200 18 58 12 105 8 3,7 8 M 16 4,98
100 108 109 190 24 235 22 65 12 128 8 3,7 8 M 20 6,85
114,3 115,5 134 6,70
125 133 134 220 26 270 25 68 12 155 8 4 8 M 22 9,42
139,7 141 162 9,20
150 159 161 250 28 300 25 75 12 182 10 5 8 M 22 12,4
168,3 170,5 192 12,0
175 193,7 195,5 280 28 330 25 75 15 218 10 5 12 M 22 13,6
200 219,1 221 310 30 360 25 80 16 244 10 5 12 M 22 16,8
250 267 269 370 32 425 30 88 18 292 12 5,5 12 M 27 23,8
273 275 298 23,3
300 323,9 326 430 34 485 30 92 18 352 12 6 16 M 27 30,5
350 355,6 357,5 490 38 555 33 100 20 398 12 6,4 16 M 30 47,6
368 370 44,5
400 406,4 408,5 550 40 620 36 110 20 452 12 7,3 16 M 33 62,1
419 421 58,3
450 457,2 459 600 40 670 36 115 20 492 12 8 20 M 33 67,8
500 508 510 660 44 730 36 125 20 558 12 8 20 M 33 88,8
600 609,6 611,5 770 46 845 39 125 20 660 12 8 20 M 36 x 3 114
700 711,2 715 875 46 960 42 125 20 760 12 10 24 M 39 x 3 138
800 812,8 817 990 50 1085 48 135 22 865 12 11 24 M 45 x 3 185
900 914,4 918 1090 54 1185 48 145 24 968 12 12 28 M 45 x 3 224
1000 1016 1020 1210 58 1320 56 155 24 1070 16 13 28 M 52 x 3 293
* The weight is approximate and calculated on base 7.85 Kg/dm3

UNI 2284 weld neck flange PN40

20230217065515 89362 - UNI Flanges

ITALIAN STANDARDS UNI 2284 WELD NECK FLANGE RF PN 40
Directions for the designation d1 a b D f h h1 m r s Holes Screws Weight*
Rated Diameter External diameter of the pipe Kg
15 20 21 65 16 95 14 38 6 30 4 2,5 4 M 12 0,83
21,3 22,5 32 0,83
20 25 26 75 18 105 14 40 6 38 4 2,5 4 M 12 1,15
26,9 28 40 1,15
25 30 31 85 18 115 14 40 6 42 4 2,8 4 M 12 1,39
33,7 34,5 46 1,38
32 38 39 100 18 140 18 42 6 52 6 3 4 M 16 2,03
42,4 43,5 56 2,01
40 44,5 45,5 110 18 150 18 45 7 60 6 3 4 M 16 2,35
48,3 49,5 64 2,33
50 57 58 125 20 165 18 48 8 72 6 3,5 4 M 16 3,11
60,3 61,5 75 3.08
65 76,1 77 145 22 185 18 52 10 90 6 3,5 8 M 16 3,95
80 88,9 90 160 24 200 18 58 12 105 8 3,7 8 M 16 4,98
100 108 109 190 24 235 22 65 12 128 8 3,7 8 M 20 6,85
114,3 115,5 134 6,70
125 133 134 220 26 270 25 68 12 155 8 4 8 M 22 9,42
139,7 141 162 9,20
150 159 161 250 28 300 25 75 12 182 10 5 8 M 22 12,4
168,3 170,5 192 12,0
175 193,7 195,5 295 32 350 30 82 15 218 10 5,5 12 M 27 17,6
200 219,1 221 320 34 375 30 88 16 244 12 5,5 12 M 27 20,8
250 267 269 385 38 450 33 105 18 298 12 6,5 12 M 30 34,3
273 275 306 33,8
300 323,9 326 450 42 515 33 115 18 362 12 7,3 16 M 30 47,4
350 355,6 357,5 510 46 580 36 125 20 408 12 8 16 M 33 69,0
368 370 65,0
400 406,4 408,5 585 50 660 39 135 20 462 12 9 16 M 36 x 3 96,5
419 421 91,6
450 457,2 459 610 50 685 39 135 20 500 12 9 20 M 36 x 3 91,6
500 508 510 670 52 755 42 140 20 562 12 10 20 M 39 x 3 117
* The weight is approximate and calculated on base 7.85 Kg/dm3

Dimensions of UNI blind flanges

UNI 6092 blind flange PN10
20230217070943 25681 - UNI Flanges

ITALIAN STANDARDS UNI 6092 BLIND FLANGE PN 10
Rated Diameter a b D f Number of holes Threading of the screws Weight* in Kg
15 65 14 95 14 4 M 12 0,71
20 75 16 105 14 4 M 12 1,01
25 85 16 115 14 4 M 12 1,22
32 100 16 140 18 4 M 16 1,80
40 110 16 150 18 4 M 16 2,09
50 125 18 165 18 4 M 16 2,87
65 145 18 185 18 4 M 16 3,65
80 160 20 200 18 4 M 16 4,61
100 180 20 220 18 8 M 16 5,65
125 210 22 250 18 8 M 16 8,12
150 240 22 285 22 8 M 20 10,5
175 270 24 315 22 8 M 20 14,1
200 295 24 340 22 8 M 20 16,5
250 350 26 395 22 12 M 20 24,1
300 400 26 445 22 12 M 20 30,8
350 460 26 505 22 16 M 20 39,6
400 515 26 565 25 16 M 22 49,6
450 565 26 615 25 20 M 22 58,6
500 620 28 670 25 20 M 22 75,3
* The weight is approximate and calculated on base 7.85 Kg/dm3

UNI 6093 blind flange PN16
20230217070943 25681 - UNI Flanges

ITALIAN STANDARDS UNI 6093 BLIND FLANGE PN 16
Rated Diameter a b D f Number of holes Threading of the screws Weight* in Kg
15 65 14 95 14 4 M 12 0,71
20 75 16 105 14 4 M 12 1,01
25 85 16 115 14 4 M 12 1,22
32 100 16 140 18 4 M 16 1,80
40 110 16 150 18 4 M 16 2,09
50 125 18 165 18 4 M 16 2,87
65 145 18 185 18 4 M 16 3,65
80 160 20 200 18 8** M 16 4,61
100 180 20 220 18 8 M 16 5,65
125 210 22 250 18 8 M 16 8,12
150 240 22 285 22 8 M 20 10,5
175 270 24 315 22 8 M 20 14,1
200 295 24 340 22 12 M 20 16,2
250 355 26 405 25 12 M 22 25,1
300 410 28 460 25 12 M 22 35,2
350 470 30 520 25 16 M 22 48,2
400 525 32 580 30 16 M 27 63,5
450 585 32 640 30 20 M 27 77,2
500 650 34 715 33 20 M 30 102
* The weight is approximate and calculated on base 7.85 Kg/dm3
** For PN10 the flange should have 4 holes

Dimensions of UNI threaded flanges

UNI 2253 threaded flange PN6

20230217071252 73083 - UNI Flanges

ITALIAN STANDARDS UNI 2253 THREADED FLANGE PN 6
Rated Diameter d1 Flange Neck Raised face Screws Weight (7,85 Kg/dm3)
Thread D b k h1 d3 d4 f Number Thread d2 Kg
15 21,3 R 1/2 80 12 55 20 30 40 2 4 M 10 11 0,373
20 26,9 R 3/4 90 14 65 24 40 50 2 4 M 10 11 0,59
25 33,7 R 1 100 14 75 24 50 60 2 4 M 10 11 0,743
32 42,4 R 1 1/4 120 14 90 26 60 70 2 4 M 12 14 1,05
40 48,3 R 1 1/2 130 14 100 26 70 80 3 4 M 12 14 1,2
50 60,3 R 2 140 14 110 28 80 90 3 4 M 12 14 1,37
65 76,1 R 2 1/2 160 14 130 32 100 110 3 4 M 12 14 1,92
80 88,9 R 3 190 16 150 34 110 128 3 4 M 16 18 2,82
100 114,3 R 4 210 16 170 38 130 148 3 4 M 16 18 3,19
125 139,7 R 5 240 18 200 40 160 178 3 8 M 16 18 4,47
150 165,1 R 6 265 18 225 44 185 202 3 8 M 16 18 5,3

UNI 2254 threaded flange PN16

20230217071252 73083 - UNI Flanges

ITALIAN STANDARDS UNI 2254 THREADED FLANGE PN 16
Rated Diameter d1 Flange Neck Raised face Screws Weight (7,85 Kg/dm3)
Thread D b k h1 d3 d4 f Number Thread d2 Kg
15 21,3 R 1/2 95 14 65 20 35 45 2 4 M 12 14 0,613
20 26,9 R 3/4 105 16 75 24 45 58 2 4 M 12 14 0,91
25 33,7 R 1 115 16 85 24 52 68 2 4 M 12 14 1,1
32 42,4 R 1 1/4 140 16 100 26 60 78 2 4 M 16 18 1,6
40 48,3 R 1 1/2 150 16 110 26 70 88 3 4 M 16 18 1,78
50 60,3 R 2 165 18 125 28 85 102 3 4 M 16 18 2,43
65 76,1 R 2 1/2 185 18 145 32 105 122 3 4 M 16 18 3,18
80 88,9 R 3 200 20 160 34 118 138 3 8 M 16 18 4,12
100 114,3 R 4 220 20 180 38 140 158 3 8 M 16 18 4,47
125 139,7 R 5 250 22 210 40 168 188 3 8 M 16 18 6,13
150 165,1 R 6 285 22 240 44 195 212 3 8 M 20 22 7,92

Dimensions of UNI lap joint flanges

UNI 6089 lap joint flange PN10

20230217071902 89592 - UNI Flanges

ITALIAN STANDARDS UNI 6089 LOOSE FLANGE PN 10
Directions for the designation Lapped flanges Sscrews Weight of Flange
Rated Diameter External diameter of the pipe a b D d2 f t Holes
25 30 85 16 115 33 14 4 4 M12 1,11
33,7 37 1,08
32 38 100 16 140 41 18 4 4 M 16 1,63
42,4 46 1,58
40 44,5 110 16 150 48 18 4 4 M 16 1,85
48,3 52 1,81
50 57 125 16 165 62 18 4 4 M 16 2,16
60,3 64 2,14
65 76,1 145 16 185 80 18 4 4 M 16 2,60
80 88,9 160 18 200 94 18 5 8** M 16 3,14
100 108 180 18 220 113 18 5 8 M 16 3,63
114,3 119 3,47
125 133 210 18 250 138 18 5 8 M 16 4,49
139,7 145 4,26
150 159 240 18 285 164 22 5 8 M 20 5,54
168,3 174 5,16
175 193,7 270 20 315 200 22 5 8 M 20 6,76
200 219,1 295 20 340 225 22 5 8 M 20 7,46
250 267 350 22 395 273 22 5 12 M 20 10,2
273 279 9,73
300 323,9 400 26 445 330 22 5 12 M 20 13,2
350 355,6 460 28 505 362 22 5 16 M 20 19,9
368 374 18,4
400 406,4 515 32 565 413 25 6 16 M 22 27,2
419 426 25,0
450 457,2 565 34 615 464 25 6 20 M 22 31,3
500 508 620 38 670 515 25 6 20 M 22 39,9
600 609,6 725 44 780 618 30 6 20 M 27 56,3
700 711,2 840 50 895 721 30 6 24 M 27 79,7
800 812,8 950 56 1015 824 33 6 24 M 30 112
* The weight is approximate and calculated on base 7.85 Kg/dm3
** For PN10 the flange should have 4 holes

UNI 6090 lap joint flange PN16

20230217071902 89592 - UNI Flanges

ITALIAN STANDARDS UNI 6090 LOOSE FLANGE PN 16
Directions for the designation Lapped flanges Sscrews Weight of Flange
Rated Diameter External diameter of the pipe a b D d2 f t Holes
25 30 85 16 115 33 14 4 4 M12 1,11
33,7 37 1,08
32 38 100 16 140 41 18 4 4 M 16 1,63
42,4 46 1,58
40 44,5 110 16 150 48 18 4 4 M 16 1,85
48,3 52 1,81
50 57 125 16 165 62 18 4 4 M 16 2,16
60,3 64 2,14
65 76,1 145 16 185 80 18 4 4 M 16 2,60
80 88,9 160 18 200 94 18 5 8*** M 16 3,14
100 108 180 18 220 113 18 5 8 M 16 3,63
114,3 119 3,47
125 133 210 18 250 138 18 5 8 M 16 4,49
139,7 145 4,26
150 159 240 18 285 164 22 5 8 M 20 5,54
168,3 174 5,16
175 193,7 270 20 315 200 22 5 8 M 20 6,76
200 219,1 295 20 340 225 22 5 12 M 20 7,22
250 267 355 24 405 273 25 5 12 M 22 12,0
273 279 11,6
300 323,9 410 28 460 330 25 5 12 M 22 16,3
350 355,6 470 32 520 362 25 5 16 M 22 25,4
368 374 23,6
400 406,4 525 36 580 413 30 6 16 M 27 33,4
419 426 31,0
450 457,2 585 40 640 464 30 6 20 M 27 43,3
500 508 650 44 715 515 33 6 20 M 30 60,6
* The weight is approximate and calculated on base 7.85 Kg/dm3
** Raw hole to be worked again according to the real external diameter of the pipe
*** For PN10 the flange should have 4 holes

Manufacturing process of UNI flange

UNI flanges can be produced by forging, casting, cutting or rolling. We mainly produce flanges by forging, cutting and rolling processes.

Manufacturing process of UNI forged flange

The welding neck flanges shall be forged steel, and the blind flanges may be made from either forged steel or from steel plate.

20221213060528 74749 - UNI Flanges

  • Raw material inspection – The key raw material used to produce flanges is billet or hot rolled bar stock. All raw materials purchased are supplied with test reports in accordance with British Standards with full traceability. This is the first mandatory step in the flange production process to ensure good quality. The raw materials are retested in-house to ensure chemical composition, mechanical properties and metallographic analysis.
  • Cutting of raw materials – Correct and strict control of cutting sizes and proportions ensures full cost control.
  • Heating – This is a very important step for the quality of the flanges. It is necessary to keep detailed records of heating temperatures to avoid overheating. Overheating can damage the structure of the metal and the mechanical properties of the raw material.
  • Forging – The forging process is divided into free forging and die forging. The forging time and strength of flanges vary for different pressure classes.
  • Heat treatment-The purpose of heat treatment is to eliminate the stress inside the flange and make the density more uniform. Careful recording of heat treatment temperature and cooling time is the key.
  • Inspection of forging blanks – After the heat treatment process, select batch samples are tested again for chemical composition and mechanical properties to ensure that all items pass.
  • Machining of forging blanks – During machining, inspection is performed along with machining to ensure that each part of the flange is qualified. Machining is performed on CNC and/or lathes.
  • Finished Product Inspection – The finished product will be inspected 100% prior to delivery to ensure that the goods meet UNI, ASME, EN or customer standards.
  • Documented Documentation – The entire production process and quality checks at different levels are documented according to UNI compliant standard operating procedures. This is the guarantee of good quality.
  • Test certificates: As we are an UNI and PED certified manufacturer, we can issue test certificates for all goods upon delivery and inspection in accordance with British Standards.
  • Packaging: All forgings and flanges are packed in wooden boxes or crates or pallets to ensure safe movement of the goods.

Manufacturing process of UNI plate cutting flange

The process here is relatively simple, and the key raw material is hot rolled plate. The process is mainly used to produce lower thickness sliding plate flanges and blind flanges. All plates purchased are accompanied by a test certificate to UNI Standards.
The circles are cut from the plates.
No heat treatment is involved in the flange manufacturing process.
Drilling and machining is carried out on the circles to obtain the required dimensions.
The goods are visually inspected and marked in accordance with the relevant standards.

Marking of UNI Flanges

UNI Flanges are typically marked with various information that helps identify the flange’s characteristics and properties. The markings can vary slightly depending on the specific standard and type of flange. Here are some typical markings found on UNI flanges:

  • Manufacturer’s name or trademark.
  • Flange standard designation (e.g., UNI 2278-67).
  • Nominal pipe size (NPS) or nominal bore size (DN).
  • Pressure rating (PN) or pressure class (e.g., PN 16 or Class 150).
  • Material identification (e.g., carbon steel, stainless steel, etc.).
  • Heat code or heat number (used for traceability).
  • Identify the flange’s facing type (e.g., raised face, flat face, ring type joint, etc.).
  • Bolt hole diameter and several bolt holes.
  • Manufacturing date or code.

Any additional markings or symbols required by the specific standard or application.
Specific markings may only be present on particular flanges, and some industries or applications may require additional markings. It is crucial to verify that the markings on the flange meet the necessary specifications for the intended use to guarantee proper fit and optimal performance.

Packing of UNI Flanges

How to package UNI flanges?

Packaging UNI flanges typically involves the following steps:

  • 1. Clean the Flanges: Before packaging, ensure that the UNI flanges are thoroughly cleaned and free from debris or contaminants.
  • 2. Wrap the Flanges: Wrap each UNI flange individually with a layer of protective material, such as bubble wrap or foam, to prevent them from being scratched or damaged during transportation.
  • 3. Choose a Sturdy Box: It’s crucial to select a sturdy box that is appropriate for the flanges. This will prevent them from moving around and potentially getting damaged.
  • 4. Add Protective Fillers: Once the box has been chosen, add protective fillers such as packing peanuts or air pillows to the empty spaces between the flanges. This will prevent them from shifting during transport, providing an extra layer of protection.5. Seal the Box: Use strong packing tape to close and seal the box. Make sure that the video is applied evenly and covers all seams and corners of the box.
  • 6. Label the Box: It’s essential to label your package with all the necessary shipping information. Make sure to include the destination address, return address, and any handling instructions to ensure your package arrives at its intended location without any issues.
  • 7. Choose a Reliable Shipping Service: A reliable and trusted shipping service is crucial to ensure your package is handled and delivered safely and on time. Research different shipping services and choose the one that best fits your needs, considering factors such as speed, cost, and package size.

Following these steps, you can effectively package UNI flanges for safe and secure transportation.
20230213040619 47357 - UNI Flanges

Inspection and measurement of UNI Flanges

The examination and quantification of UNI flanges encompass evaluating their material composition, dimensions, surface texture, alignment of bolt holes, size of bolt holes, and thread used in bolt holes.
Material:
UNI flanges are typically made from carbon steel, stainless steel, or alloy steel. The choice of material depends on the specific application and the environmental conditions to which the flange will be exposed. The most common material for UNI flanges is carbon steel, which is known for its high strength and durability.
Dimension:
The dimension of a UNI flange is an essential factor to consider, as it affects the overall performance and compatibility with other components in the system. The dimensions of UNI flanges are standardized, with different classes and sizes available. The dimensions of a UNI flange are typically specified in millimeters and include the outer diameter, inner diameter, thickness, and height.
Surface Finish:
The surface finish of a UNI flange is an essential factor to consider, as it affects the seal between the flange and the gasket. A smooth surface finish is necessary to ensure a tight seal and prevent leaks. The surface finish of UNI flanges is typically specified in micrometers, with different classes and ranges available.
Bolt Hole Alignment:
The bolt-hole alignment of a UNI flange is an essential factor to consider, as it affects the ease of installation and the system’s overall stability. The bolt holes must be appropriately aligned to ensure that the bolts can be tightened uniformly and that the flange can be securely attached to other components in the system.
Bolt Hole Size:
The bolt-hole size of a UNI flange is an essential factor to consider, as it affects the compatibility with other components in the system. The bolt hole size must be large enough to accommodate the bolts that attach the flange to other system members.
Bolt Hole Thread:
The bolt-hole thread of a UNI flange is an essential factor to consider, as it affects the compatibility with the bolts that will be used to attach the flange to other components in the system. The bolt-hole thread must be compatible with the bolts and be of the correct size and pitch.
By paying attention to these factors, you can ensure that your UNI flanges are compatible with other components in the system and will perform reliably over the long term.

Application of UNI Flanges

UNI Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. These UNI Flange is use in various industries like:

  • Stainless Steel UNI Flange uses in Oil and Gas Pipeline;
  • UNI Flange uses in Chemical Industry;
  • Alloy Steel UNI Flange uses in Plumbing;
  • UNI Flange uses in Heating;
  • UNI Flange uses in Water Supply Systems;
  • UNI Flange uses in Power Plant;
  • UNI Flange uses in Paper & Pulp Industry;
  • UNI Flange uses in General Purpose Applications;
  • Steel UNI Flange uses in Fabrication Industry;
  • UNI Flange uses in Food Processing Industry;
  • UNI Flange uses in Structural Pipe.

How to purchase the correct UNI flanges?

Purchasing the right UNI flange can be daunting whether you are a seasoned professional or new to the industry. From determining the materials needed to considering the price, several factors exist. We will detail the steps required to purchase the correct UNI flange for your needs.

Determining the required materials

The first step in purchasing the correct UNI flange is determining the required material. Various materials, including carbon steel, stainless steel, and alloy steel, can make UNI flanges. Your choice of material will depend on the application and environment in which you will use the flange. For instance, if you need a flange for high-temperature or corrosive environments, the best choice is high-temperature stainless steel or alloy.

Identifying Flange Types

After identifying the desired material, you must determine the flange type. UNI provides various flanges, such as butt-weld flanges, sliding flanges, threaded flanges, and socket weld flanges. Each class has unique features and benefits, and the choice depends on specific needs. For instance, high-pressure applications typically use butt-weld flanges, while low-pressure applications generally use slip-on flanges.

Determine flange size and pressure rating.

After determining the flange type, you must select the size and pressure rating. Various sizes and pressure ratings of UNI flanges are available, and choosing the correct size and pressure rating is critical to ensure that the flange works appropriately. Be sure to refer to industry standards and regulations when determining the right size and pressure rating for your needs.

Look for quality and certification.

Quality and certification are critical when purchasing UNI flanges. Look for flanges manufactured to industry standards and undergo strict quality control measures. In addition, look for flanges that have been certified by recognized organizations such as ISO, API, and ASME. These certifications show that the flanges have been tested and meet industry standards for quality and performance.

Consider Price

Finally, consider the price when purchasing UNI flanges. One should think about price and prioritize quality and performance when purchasing. Be sure to compare multiple suppliers’ prices and consider additional costs, such as shipping and handling.

Purchasing the correct UNI flange requires careful consideration of several factors. By determining the materials needed, identifying the flange type, choosing the flange size and pressure rating, looking for quality and certifications, and considering the price, you can make an informed decision and select the correct UNI flange for your needs.

How to select UNI flanges manufacturer?

If you’re in need of UNI flanges, choosing a manufacturer that you can rely on is crucial. With a wide variety of options available, it can be challenging to identify the one that can provide you with high-quality products and exceptional customer service. We’ll discuss the essential factors you should consider when selecting a UNI flange manufacturer.
Quality of Products
When it comes to UNI flanges, quality is king. When selecting a manufacturer, it is crucial to prioritize their reputation for producing high-quality products. To ensure that the flanges you receive are durable, reliable, and meet industry standards, consider a manufacturer that utilizes premium materials like stainless steel or carbon steel, and has an established quality control process in place. These factors are indicative of a trustworthy manufacturer who prioritizes excellence and reliability in their products.
Industry Experience
When selecting UNI flanges, it is imperative to take into account the manufacturer’s level of industry experience. A well-established company with a long-standing history of producing high-quality UNI flanges will undoubtedly have a proven track record of success. Opting for a manufacturer with ample experience will guarantee that your flanges will be precisely crafted to meet your specifications. Additionally, an experienced manufacturer can offer invaluable insights and recommendations on which flanges are best suited for your unique application.
Production Capacity
When selecting a manufacturer, it’s crucial to take into account their production capacity. You must ascertain whether they can handle large or intricate orders and whether they can meet delivery deadlines. To guarantee a satisfactory outcome, it’s advisable to choose a manufacturer with a spacious production facility and a proficient workforce. This will ensure that your order is processed promptly and to your precise specifications.
Pricing
When choosing a manufacturer, it’s essential to consider more than just the price. While cost is undoubtedly an important factor, it shouldn’t be the only consideration. It’s crucial to select a manufacturer that provides competitive pricing while still maintaining the highest quality standards. It’s important to remember that the cheapest option may not always be the most cost-effective one in the long run, as it could end up costing you more due to lower-quality products. Therefore, it’s crucial to balance affordability and quality to make a wise decision when selecting a manufacturer.
Customer Service
When selecting a manufacturer, it’s essential to take their level of customer service into account. To ensure a positive experience, opt for a company that is highly responsive to your inquiries, maintains clear communication throughout the ordering process, and offers a satisfaction guarantee. An excellent manufacturer should be dedicated to your satisfaction and willing to collaborate with you to resolve any problems that may arise. By prioritizing customer service, you can have confidence in your decision and enjoy a stress-free experience.
It’s crucial to select a manufacturer that provides excellent customer service, as this will ensure that you have a smooth and hassle-free experience from start to finish. By taking all of these factors into consideration, you can feel confident that you’ve made the best possible choice for your UNI flange needs.

Why Choose Jihua to Be Your UNI Flange Supplier?

If you’re looking for a reliable and trustworthy supplier of UNI flanges, consider choosing Jihua. As a well-established and reputable manufacturer and supplier of high-quality UNI flanges, Jihua has been satisfying customers worldwide for many years. Here are some reasons why Jihua might be the best fit for your UNI flange needs:

  • First and foremost, Jihua is committed to providing high-quality UNI flanges made from top-quality materials and manufactured to the highest standards. The company maintains strict quality control procedures to ensure that each product meets or exceeds customer expectations.
  • Additionally, Jihua offers competitive pricing on its products, which means you can get high-quality UNI flanges at an affordable price. This cost-effectiveness is due to Jihua’s efficient manufacturing and distribution processes.
  • Moreover, Jihua offers a wide range of UNI flanges, including ANSI, DIN, JIS, EN, and other international standards. This diverse product range allows you to find the right product to meet your specific needs.
  • Furthermore, Jihua is committed to providing excellent customer service and support to all of its customers. The company has a team of experienced professionals who are available to answer any questions or concerns you may have.
  • Lastly, Jihua understands the importance of timely delivery and works hard to ensure that all orders are shipped out quickly and efficiently. This ensures that you receive your order in a timely manner, which is especially important for time-sensitive projects.

Jihua is a reliable and trustworthy supplier of UNI flanges that can meet your needs and exceed your expectations. Choose Jihua for high-quality products, competitive pricing, a wide range of products, excellent customer service, and fast delivery.

Export Country For UNI Flanges

MIDDLE EAST AFRICA NORTH AMERICA EUROPE ASIA SOUTH AMERICA
Saudi Arabia Nigeria Usa Russia India Argentina
Iran Algeria Canada Norway Singapore Bolivia
Iraq Angola Mexico Germany Malaysia Brazil
Uae South Africa Panama France Indonesia Chile
Qatar Libya Costa Rica Italy Thailand Venezuela
Bahrain Egypt Puerto Rica Uk Vietnam Colombia
Oman Sudan Trinidad And Tobago Spain South Korea Ecuador
Kuwait Equatorial Guinea Jamaica Ukraine Japan Guyana
Turkey The Republic Of Congo Bahamas Netherland Sri Lanka Paraguay
Yemen Gabon Denmark Belgium Maldives Uruguay
Syria Greece Bangladesh
Jordan Czech Republic Mayanmar
Cyprus Portugal Taiwan
Hungary Cambodia
Albania
Austria
Switzerland
Slovakia
Finland
Ireland
Croatia
Slovenia
Malta

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