Flanges Supplier in India

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Flanges

Flanges Supplier in India

Nicorex Alloys is an ISO 9001 and ISO 14001 certified flange supplier in Mumbai, India, stocking industrial flanges across all major material families for immediate dispatch. We stock Hastelloy (C276, C22, C2000), Inconel (600, 625, 718), Incoloy (800/800H/800HT, 825), Monel (400, K500), Nickel 200/201, Duplex Steel (UNS S31803/S32205), and Super Duplex Steel (S32750, S32760). Per client designs and project specifications, custom flanges are available.

Flanges are made from forged stainless steel, duplex stainless steel, and nickel alloys with chemical compositions prescribed by ASTM/ASME material specifications (e.g., ASTM A182, B564). Plate flanges are limited to low-pressure service, such as AWWA. They feature bolt holes for secure, detachable joints and raised faces to compress sealing gaskets. Products include welded neck, slip-on, blind, threaded, socket weld, lap joint, long weld neck, orifice, spectacle blind, and ring spacer in sizes from NPS ½ (15 NB / DN15) to NPS 48 (1200 NB / DN1200), with custom dimensions up to DN5000. Class 150–2500 LBS and EN/DIN PN6–PN400 are pressure classifications.

Dimensional standards include ASME B16.5 (NPS ½ to 24), ASME B16.47 Series A and B (NPS 26-60), EN 1092-1, DIN, JIS B2220, and GOST 12820/12821. Face types include raised face (RF), ring-type joint (RTJ), flat face (FF), tongue and groove (T&G), and male and female. Every order includes PMI reports, EN 10204/3.1B mill test certifications, and full traceability. In Mumbai, Nicorex works with the pharmaceutical, maritime, power, petroleum, and chemical industries.

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High-Quality Flanges Material for Every Industry

Nicorex Alloys supplies Mumbai with diverse flange material grades, each specifically engineered for unique industrial service environments

Hastelloy Flanges

Inconel Flanges

Monel Flanges

Nickel Alloy Flanges

Duplex Steel Flanges

Super Duplex Steel Flanges

Flanges Specification

The following table shows the specifications of flanges, including international standards, ensuring dimensional interchangeability and code compliance across global projects.
Parameter Details
Size ½” (15 NB) to 48″ (1200 NB / DN1200)
Pressure Class Class 150, 300, 400, 600, 900, 1500, 2500 LBS; PN6–PN400
Dimensional Standards ASME B16.5, B16.47 Series A & B, B16.36, B16.48, EN 1092-1, DIN, JIS B2220, GOST 12820/12821
Material Standards ASTM A182/SA182, ASTM B564/SB564, ASTM A105/A350 LF2
Facing Types RF, FF, RTJ
Coating Anti-rust oil, Black paint, Galvanised
Testing PMI, UT, RT
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Flanges Standards

ASME B16.5 and B16.47 standards cover various flange sizes and classes, while international projects utilise EN 1092-1, JIS B2220, or GOST 12820/12821 specifications to meet specific Japanese or European regional engineering requirements.
  • ASME Flanges
  • ANSI Flanges
  • ASTM Flanges
  • AWWA Flanges
  • MSS Flanges
  • DIN Flanges
  • EN Flanges
  • ISO Flanges
  • JIS Flanges
  • GOST Flanges
  • UNI Flanges
  • API Flanges

Flanges Dimensions

Flange outer diameters, bolt circles, and thickness meet ASME B16.5 specifications. A class 150 NPS-6 flange has an outside diameter of 279.4 mm, while a class 2500 has 381.0 mm.
DN
(inch) 		DimensionANSI B16.5 Flange Dimensional Sizes 3 to 10 inches Table Chart
125 lbs
150 lbs		300 lbs400 lbs600 lbs900 lbs1500 lbs2500 lbs
inchmminchmminchmminchmminchmminchmminchmm
3A7 1/2190.581/4209.681/4209.68 1/4209.69 1/224110 1/226712305
b15/1623.81 1/828.611/431.81 1/431.81 1/238.11 7/847.62 5/866.7
D25127512751275127512751275127
D16152.46 5/8168.36 5/8168.36 5/8168.371/2190.582039228.6
n44888888888888
d3/4197/822.27/822.27/822.2125.41 1/431.81 3/834.9
3 1/2A8 1/2215.99228.69228.69228.6––––––
b15/1623.813/1630.213/834.913/834.9––––––
D25 1/2139.75 /2139.75 1/2139.75 1/2139.7––––––
D17177.87 1/4184.27 1/4184.27 1/4184.2––––––
n88888888––––––
d3/4197/822.2125.4125.4––––––
4A9228.6102541025410 3/427311 1/229212 1/431114356
b15/1623.81 1/431.71 3/834.91 1/238.11 3/444.42 1/854376.2
D26 3/16157.26 3/16157.26 3/16157.26 3/16157.26 3/16157.26 3/16157.26 3/16157.2
D17 1/21907 7/82007 7/82008 1/2215.99 1/42359 1/224110 3/4273
n88888888888888
d3/4197/822.2125.4125.41 1/431.81 3/834.91 5/841.3
5A1025411279.411279.413330.213 3/434914 3/437516 1/2419
b1 5/1623.813/834.91 1/238.11 3/444.4250.82 7/8733 5/892.1
D27 5/16185.77 5/16185.77 5/16185.77 5/16185.77 5/16185.77 5/16185.77 5/16185.7
D18 1/2215.99 1/4234.99 1/4234.910 1/2266.71127911 1/229212 3/4324
n88888888888888
d7/822.27/822.2125.41 1/828.61 3/834.91 5/841.31 7/847.6
6A1127912 1/2317.512 1/2317.514355.61538115 1/239419483
b125.417/1636.51 5/841.31 7/847.62 3/1655.63 1/482.64 1/4108
D28 1/22168 1/2215.98 1/2215.98 1/2215.98 1/2215.98 1/2215.98 1/2216
D19 1/224110 5/8269.910 5/8269.911 1/2292.112 1/231812 1/231814 1/2368
n881212121212121212121288
d7/822.27/822.2125.41 1/828.61 1/431.81 1/238.12 1/854
8A13 1/2342.9153811538116 1/241918 1/247019482.621 3/4552
b1 1/828.61 5/841.31 7/847.62 3/1655.62 1/263.53 5/892.15127
D210 5/8269.910 5/8269.910 5/8269.910 5/8269.910 5/8269.910 5/8269.910 5/8269.9
D111 3/4298.413330.213330.213 3/4349.215 1/2394.215 1/2394.217 1/4438
n88121212121212121212121212
d7/822.2125.41 1/828.61 1/431.81 1/238.11 3/444.52 1/854
10A16406.417 1/2444.517 1/2444.52050821 1/25462358426 1/2673
b1 3/1630.21 7/847.62 1/8542 1/263.52 3/469.84 1/41086 1/2165
D212 3/4323.812 3/4323.812 3/4323.812 3/4323.812 3/4323.812 3/4323.812 3/4323.8
D114 1/4361.915 1/4387.415 1/4387.417431.818 1/247019482.621 1/4540
n1212161616161616161612121212
d125.41 1/828.61 1/431.81 3/834.91 1/238.1250.82 5/866.7

ASME B16 5 Flange Dimensions

Class 150 Flange Dimensions in mm

class 150 flange dimensions chart
Nominal Pipe Size/ Bore for LWN Outside Diameter Min. Thickness Diameter of Raised Face Min. Thickness Lap Joint Diameter of Hub Diameter Beginning of Chamfer Welding Neck Threaded Slip-on Socket Welding Lapped Welding Neck Long Welding Neck Minimum Thread Length Threaded Minimum Slip-On Socket Welding Minimum Lapped Welding Neck / Socket Welding Corner Bore Radius of Lapped Flange and Pipe Depth of Socket Bolt Circle Dia Number of Holes Diameter of Holes
J O tf R tf X A Y1 Y2 Y3 Y4 T B1 B2 B3 r D
½ 3.50 0.38 1.38 0.44 1.19 0.84 0.56 0.62 1.81 9.00 0.62 0.88 0.90 Note-3 0.12 0.38 2.38 4 0.63
¾ 3.88 0.44 1.69 0.50 1.50 1.05 0.56 0.62 2.00 9.00 0.62 1.09 1.11 Note-3 0.12 0.44 2.75 4 0.63
1 4.25 0.50 2.00 0.56 1.94 1.32 0.62 0.69 2.12 9.00 0.69 1.36 1.38 Note-3 0.12 0.50 3.12 4 0.63
1¼ 4.62 0.56 2.50 0.62 2.31 1.66 0.75 0.81 2.19 9.00 0.81 1.70 1.72 Note-3 0.19 0.56 3.50 4 0.63
1½ 5.00 0.62 2.88 0.69 2.56 1.90 0.81 0.88 2.38 9.00 0.88 1.95 1.97 Note-3 0.25 0.62 3.88 4 0.63
2 6.00 0.69 3.62 0.75 3.06 2.38 0.94 1.00 2.44 9.00 1.00 2.44 2.46 Note-3 0.31 0.69 4.75 4 0.75
2½ 7.00 0.81 4.12 0.88 3.56 2.88 1.06 1.12 2.69 9.00 1.12 2.94 2.97 Note-3 0.31 0.75 5.50 4 0.75
3 7.50 0.88 5.00 0.94 4.25 3.50 1.12 1.19 2.69 9.00 1.19 3.57 3.60 Note-3 0.38 0.81 6.00 4 0.75
3½ 8.50 0.88 5.50 0.94 4.81 4.00 1.19 1.25 2.75 9.00 1.25 4.07 4.10 Note-3 0.38 – 7.00 8 0.75
4 9.00 0.88 6.19 0.94 5.31 4.50 1.25 1.31 2.94 Note-3 1.31 4.57 4.60 Note-3 0.44 – 7.50 8 0.75
5 10.00 0.88 7.31 0.94 6.44 5.56 1.38 1.44 3.44 12.00 1.44 5.66 5.69 Note-3 0.44 – 8.50 8 0.88
6 11.00 0.94 8.50 1.00 7.56 6.63 1.50 1.56 3.44 12.00 1.56 6.72 6.75 Note-3 0.50 – 9.50 8 0.88
8 13.50 1.06 10.62 1.12 9.69 8.63 1.69 1.75 3.94 12.00 1.75 8.72 8.75 Note-3 0.50 – 11.75 8 0.88
10 16.00 1.12 12.75 1.19 12.00 10.75 1.88 1.94 3.94 12.00 1.94 10.88 10.92 Note-3 0.50 – 14.25 12 1.00
12 19.00 1.19 15.00 1.25 14.38 12.75 2.12 2.19 4.44 12.00 2.19 12.88 12.92 Note-3 0.50 – 17.00 12 1.00
14 21.00 1.31 16.25 1.38 15.75 14.00 2.19 3.12 4.94 12.00 2.25 14.14 14.18 Note-3 0.50 – 18.75 12 1.13
16 23.50 1.38 18.50 1.44 18.00 16.00 2.44 3.44 4.94 12.00 2.50 16.16 16.19 Note-3 0.50 – 21.25 16 1.13
18 25.00 1.50 21.00 1.56 19.88 18.00 2.62 3.81 5.44 12.00 2.69 18.18 18.20 Note-3 0.50 – 22.75 16 1.25
20 27.50 1.62 23.00 1.69 22.00 20.00 2.81 4.06 5.62 12.00 2.88 20.20 20.25 Note-3 0.50 – 25.00 20 1.25
22 29.50 1.75 25.25 1.81 24.00 22.00 3.06 4.25 5.82 12.00 – 22.22 22.25 Note-3 0.50 – 27.25 20 1.38
24 32.00 1.81 27.25 1.88 26.12 24.00 3.19 4.38 5.94 12.00 3.25 24.25 24.25 Note-3 0.50 – 29.50 20 1.38

Notes:
(1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges.
(2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickness without the raised face height. (3) To be specified by the Customer; Y4 – the length can be 9″ (B16.5) or 12″ (industry), shall be specified by the customer.

Class 300 Flange Dimensions in mm

class 300 flange dimensions in mm chart
Nominal Pipe Size/ Bore for LWN Outside Diameter Min. Thickness Diameter of Raised Face Min. Thickness Lap Joint Diameter of Hub Diameter Beginning of Chamefer Welding Neck Threaded Slip-on Socket Welding Lapped Welding Neck Long Welding Neck Minimum Thread Length Threaded Minimum Slip-On Socket Welding Minimum Lapped Welding Neck / Socket Welding Corner Bore Radius of Lapped Flange and Pipe Depth of Socket Minimum Counter-bore Threaded Flange Bolt Circle Dia Number of Holes Diameter of Holes
J O tf R tf X A Y1 Y2 Y3 Y4 T B1 B2 B3 r D Q
½ 3.75 0.50 1.38 0.56 1.50 0.84 0.81 0.88 2.00 9.00 0.62 0.88 0.90 Note-3 0.12 0.38 0.93 2.62 4 0.63
¾ 4.62 0.56 1.69 0.62 1.88 1.05 0.94 1.00 2.19 9.00 0.62 1.09 1.11 Note-3 0.12 0.44 1.14 3.25 4 0.75
1 4.88 0.62 2.00 0.69 2.12 1.32 1.00 1.06 2.38 9.00 0.69 1.36 1.38 Note-3 0.12 0.50 1.41 3.50 4 0.75
1¼ 5.25 0.69 2.50 0.75 2.50 1.66 1.00 1.06 2.50 9.00 0.81 1.70 1.72 Note-3 0.19 0.56 1.75 3.88 4 0.75
1½ 6.12 0.75 2.88 0.81 2.75 1.90 1.13 1.19 2.63 9.00 0.88 1.95 1.97 Note-3 0.25 0.62 1.98 4.50 4 0.88
2 6.50 0.81 3.62 0.88 3.31 2.38 1.25 1.31 2.69 9.00 1.12 2.44 2.46 Note-3 0.31 0.69 2.50 5.00 8 0.75
2½ 7.50 0.94 4.12 1.00 3.94 2.88 1.44 1.50 2.94 9.00 1.25 2.94 2.97 Note-3 0.31 0.75 3.00 5.88 8 0.88
3 8.25 1.06 5.00 1.12 4.62 3.50 1.63 1.69 3.06 9.00 1.25 3.57 3.60 Note-3 0.38 0.81 3.63 6.62 8 0.88
3½ 9.00 1.12 5.50 1.19 5.25 4.00 1.69 1.75 3.13 9.00 1.44 4.07 4.10 Note-3 0.38 – 4.13 7.25 8 0.88
4 10.00 1.19 6.19 1.25 5.75 4.50 1.82 1.88 3.32 Note-3 1.44 4.57 4.60 Note-3 0.44 – 4.63 7.88 8 0.88
5 11.00 1.31 7.31 1.38 7.00 5.56 1.94 2.00 3.82 12.00 1.69 5.66 5.69 Note-3 0.44 – 5.69 9.25 8 0.88
6 12.50 1.38 8.50 1.44 8.12 6.63 2.00 2.06 3.82 12.00 1.81 6.72 6.75 Note-3 0.50 – 6.75 10.62 12 0.88
8 15.00 1.56 10.62 1.62 10.25 8.63 2.38 2.44 4.32 12.00 2.00 8.72 8.75 Note-3 0.50 – 8.75 13.00 12 1.00
10 17.50 1.81 12.75 1.88 12.62 10.75 2.56 3.75 4.56 12.00 2.19 10.88 10.92 Note-3 0.50 – 10.88 15.25 16 1.13
12 20.50 1.94 15.00 2.00 14.75 12.75 2.82 4.00 5.06 12.00 2.38 12.88 12.92 Note-3 0.50 – 12.94 17.75 16 1.25
14 23.00 2.06 16.25 2.12 16.75 14.00 2.94 4.38 5.56 12.00 2.50 14.14 14.18 Note-3 0.50 – 14.19 20.25 20 1.25
16 25.50 2.19 18.50 2.25 19.00 16.00 3.19 4.75 5.69 12.00 2.69 16.16 16.19 Note-3 0.50 – 16.19 22.50 20 1.38
18 28.00 2.31 21.00 2.38 21.00 18.00 3.44 5.12 6.19 12.00 2.75 18.18 18.20 Note-3 0.50 – 18.19 24.75 24 1.38
20 30.50 2.44 23.00 2.50 23.12 20.00 3.69 5.50 6.32 12.00 2.88 20.20 20.25 Note-3 0.50 – 20.19 27.00 24 1.38
22 33.00 2.56 25.25 2.62 25.25 22.00 3.94 5.69 6.44 12.00 – 22.22 22.25 Note-3 0.50 – – 29.25 24 1.63
24 36.00 2.69 27.25 2.75 27.62 24.00 4.13 6.00 6.56 12.00 3.25 24.25 24.25 Note-3 0.50 – 24.19 32.00 24 1.63

Notes:
(1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges.
(2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height.
(3) To be specified by the Customer; Y4 – the length can be 9″ (B16.5) or 12″ (industry),shall be specified by the customer.

Class 400 Flange Dimensions in mm

class 400 flange dimensions
Nominal Pipe Size/ Bore for LWN Outside Diameter Min. Thickness Diameter of Raised Face Diameter of Hub Diameter Beginning of Chamefer Welding Neck Threaded Slip-on Socket Welding Lapped Welding Neck Long Welding Neck Minimum Thread Length Threaded Minimum Slip-On Socket Welding Minimum Lapped Welding Neck / Socket Welding Corner Bore Radius of Lapped Flange and Pipe Depth of Socket Minimum Counter-bore Threaded Flange Bolt Circle Dia Number of Holes Diameter of Holes
J O tf R X A Y1 Y2 Y3 Y4 T B1 B2 B3 r D Q
½ 3.75 0.56 1.38 1.50 0.84 0.88 0.88 2.06 9.00 0.62 0.88 0.90 Note-3 0.12 0.38 0.93 2.62 4 0.63
¾ 4.62 0.62 1.69 1.88 1.05 1.00 1.00 2.25 9.00 0.62 1.09 1.11 Note-3 0.12 0.44 1.14 3.25 4 0.75
1 4.88 0.69 2.00 2.12 1.32 1.06 1.06 2.44 9.00 0.69 1.36 1.38 Note-3 0.12 0.50 1.41 3.50 4 0.75
1¼ 5.25 0.81 2.50 2.50 1.66 1.12 1.12 2.62 9.00 0.81 1.70 1.72 Note-3 0.19 0.56 1.75 3.88 4 0.75
1½ 6.12 0.88 2.88 2.75 1.90 1.25 1.25 2.75 9.00 0.88 1.95 1.97 Note-3 0.25 0.62 1.99 4.50 4 0.88
2 6.50 1.00 3.62 3.31 2.38 1.44 1.44 2.88 9.00 1.12 2.44 2.46 Note-3 0.31 0.69 2.50 5.00 8 0.75
2½ 7.50 1.12 4.12 3.94 2.88 1.62 1.62 3.12 9.00 1.25 2.94 2.97 Note-3 0.31 0.75 3.00 5.88 8 0.88
3 8.25 1.25 5.00 4.62 3.50 1.81 1.81 3.25 9.00 1.38 3.57 3.60 Note-3 0.38 0.81 3.63 6.62 8 0.88
3½ 9.00 1.38 5.50 5.25 4.00 1.94 1.94 3.38 9.00 1.56 4.07 4.10 Note-3 0.38 – 4.13 7.25 8 1.00
4 10.00 1.38 6.19 5.75 4.50 2.00 2.00 3.50 Note-3 1.44 4.57 4.60 Note-3 0.44 – 4.63 7.88 8 1.00
5 11.00 1.50 7.31 7.00 5.56 2.12 2.12 4.00 12.00 1.69 5.66 5.69 Note-3 0.44 – 5.69 9.25 8 1.00
6 12.50 1.62 8.50 8.12 6.63 2.25 2.25 4.06 12.00 1.81 6.72 6.75 Note-3 0.50 – 6.75 10.62 12 1.00
8 15.00 1.88 10.62 10.25 8.63 2.69 2.69 4.62 12.00 2.00 8.72 8.75 Note-3 0.50 – 8.75 13.00 12 1.13
10 17.50 2.12 12.75 12.62 10.75 2.88 4.00 4.88 12.00 2.19 10.88 10.92 Note-3 0.50 – 10.88 15.25 16 1.25
12 20.50 2.25 15.00 14.75 12.75 3.12 4.25 5.38 12.00 2.38 12.88 12.92 Note-3 0.50 – 12.94 17.75 16 1.38
14 23.00 2.38 16.25 16.75 14.00 3.31 4.62 5.88 12.00 2.50 14.14 14.18 Note-3 0.50 – 14.19 20.25 20 1.38
16 25.50 2.50 18.50 19.00 16.00 3.69 5.00 6.00 12.00 2.69 16.16 16.19 Note-3 0.50 – 16.19 22.50 20 1.50
18 28.00 2.62 21.00 21.00 18.00 3.88 5.38 6.50 12.00 2.75 18.18 18.20 Note-3 0.50 – 18.19 24.75 24 1.50
20 30.50 2.75 23.00 23.12 20.00 4.00 5.75 6.62 12.00 2.88 20.20 20.25 Note-3 0.50 – 20.19 27.00 24 1.63
22 33.00 2.88 25.25 25.25 22.00 4.25 6.00 6.75 12.00 – 22.22 22.25 Note-3 0.50 – – 29.25 24 1.75
24 36.00 3.00 27.25 27.62 24.00 4.50 6.25 6.88 12.00 3.25 24.25 24.25 Note-3 0.50 – 24.19 32.00 24 1.88
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 – the length can be 9″ (B16.5) or 12″ (industry), shall be specified by the customer.

Class 600 Flange Dimensions in mm

class 600 flange dimensions in mm
Nominal Pipe Size/ Bore for LWN Outside Diameter Min. Thickness Diameter of Raised Face Diameter of Hub Diameter Beginning of Chamefer Welding Neck Threaded Slip-on Socket Welding Lapped Welding Neck Long Welding Neck Minimum Thread Length Threaded Minimum Slip-On Socket Welding Minimum Lapped Welding Neck / Socket Welding Corner Bore Radius of Lapped Flange and Pipe Depth of Socket Minimum Counter-bore Threaded Flange Bolt Circle Dia Number of Holes Diameter of Holes
J O tf R X A Y1 Y2 Y3 Y4 T B1 B2 B3 r D Q
½ 3.75 0.56 1.38 1.50 0.84 0.88 0.88 2.06 9.00 0.62 0.88 0.90 Note-3 0.12 0.38 0.93 2.62 4 0.63
¾ 4.62 0.62 1.69 1.88 1.05 1.00 1.00 2.25 9.00 0.62 1.09 1.11 Note-3 0.12 0.44 1.14 3.25 4 0.75
1 4.88 0.69 2.00 2.12 1.32 1.06 1.06 2.44 9.00 0.69 1.36 1.38 Note-3 0.12 0.50 1.41 3.50 4 0.75
1¼ 5.25 0.81 2.50 2.50 1.66 1.12 1.12 2.62 9.00 0.81 1.70 1.72 Note-3 0.19 0.56 1.75 3.88 4 0.75
1½ 6.12 0.88 2.88 2.75 1.90 1.25 1.25 2.75 9.00 0.88 1.95 1.97 Note-3 0.25 0.62 1.99 4.50 4 0.88
2 6.50 1.00 3.62 3.31 2.38 1.44 1.44 2.88 9.00 1.12 2.44 2.46 Note-3 0.31 0.69 2.50 5.00 8 0.75
2½ 7.50 1.12 4.12 3.94 2.88 1.62 1.62 3.12 9.00 1.25 2.94 2.97 Note-3 0.31 0.75 3.00 5.88 8 0.88
3 8.25 1.25 5.00 4.62 3.50 1.81 1.81 3.25 9.00 1.38 3.57 3.60 Note-3 0.38 0.81 3.63 6.62 8 0.88
3½ 9.00 1.38 5.50 5.25 4.00 1.94 1.94 3.38 9.00 1.56 4.07 4.10 Note-3 0.38 – 4.13 7.25 8 1.00
4 10.75 1.50 6.19 6.00 4.50 2.12 2.12 4.00 Note-3 1.62 4.57 4.60 Note-3 0.44 – 4.63 8.50 8 1.00
5 13.00 1.75 7.31 7.44 5.56 2.38 2.38 4.50 12.00 1.88 5.66 5.69 Note-3 0.44 – 5.69 10.50 8 1.12
6 14.00 1.88 8.50 8.75 6.63 2.62 2.62 4.62 12.00 2.00 6.72 6.75 Note-3 0.50 – 6.75 11.50 12 1.12
8 16.50 2.19 10.62 10.75 8.63 3.00 3.00 5.25 12.00 2.25 8.72 8.75 Note-3 0.50 – 8.75 13.75 12 1.25
10 20.00 2.50 12.75 13.50 10.75 3.38 4.38 6.00 12.00 2.56 10.88 10.92 Note-3 0.50 – 10.88 17.00 16 1.38
12 22.00 2.62 15.00 15.75 12.75 3.62 4.62 6.12 12.00 2.75 12.88 12.92 Note-3 0.50 – 12.94 19.25 20 1.38
14 23.75 2.75 16.25 17.00 14.00 3.69 5.00 6.50 12.00 2.88 14.14 14.18 Note-3 0.50 – 14.19 20.75 20 1.50
16 27.00 3.00 18.50 19.50 16.00 4.19 5.50 7.00 12.00 3.06 16.16 16.19 Note-3 0.50 – 16.19 23.75 20 1.62
18 29.25 3.25 21.00 21.50 18.00 4.62 6.00 7.25 12.00 3.12 18.18 18.20 Note-3 0.50 – 18.19 25.75 20 1.75
20 32.00 3.50 23.00 24.00 20.00 5.00 6.50 7.50 12.00 3.25 20.20 20.25 Note-3 0.50 – 20.19 28.50 24 1.75
22 34.25 3.75 25.25 26.25 22.00 5.25 6.88 7.75 12.00 – 22.22 22.25 Note-3 0.50 – – 30.63 24 1.88
24 37.00 4.00 27.25 28.25 24.00 5.50 7.25 8.00 12.00 3.62 24.25 24.25 Note-3 0.50 – 24.19 33.00 24 2.00
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 – the length can be 9″ (B16.5) or 12″ (industry), shall be specified by the customer.

Class 900 Flange Dimensions in mm

class 900 flange dimensions in mm
Nominal Pipe Size/ Bore for LWN Outside Diameter Min. Thickness Diameter of Raised Face Diameter of Hub Diameter Beginning of Chamefer Welding Neck Threaded Slip-on Socket Welding Lapped Welding Neck Long Welding Neck Minimum Thread Length Threaded Minimum Slip-On Socket Welding Minimum Lapped Welding Neck / Socket Welding Corner Bore Radius of Lapped Flange and Pipe Depth of Socket Minimum Counter-bore Threaded Flange Bolt Circle Dia Number of Holes Diameter of Holes
J O tf R X A Y1 Y2 Y3 Y4 T B1 B2 B3 r D Q
½ 4.75 0.88 1.38 1.50 0.84 1.25 1.25 2.38 9.00 0.88 0.88 0.90 Note-3 0.12 0.38 0.93 3.25 4 0.88
¾ 5.12 1.00 1.69 1.75 1.05 1.38 1.38 2.75 9.00 1.00 1.09 1.11 Note-3 0.12 0.44 1.14 3.50 4 0.88
1 5.88 1.12 2.00 2.06 1.32 1.62 1.62 2.88 9.00 1.12 1.36 1.38 Note-3 0.12 0.50 1.41 4.00 4 1.00
1¼ 6.25 1.12 2.50 2.50 1.66 1.62 1.62 2.88 9.00 1.19 1.70 1.72 Note-3 0.19 0.56 1.75 4.38 4 1.00
1½ 7.00 1.25 2.88 2.75 1.90 1.75 1.75 3.25 9.00 1.25 1.95 1.97 Note-3 0.25 0.62 1.99 4.88 4 1.13
2 8.50 1.50 3.63 4.12 2.38 2.25 2.25 4.00 9.00 1.50 2.44 2.46 Note-3 0.31 0.69 2.50 6.50 8 1.00
2½ 9.62 1.62 4.13 4.88 2.88 2.50 2.50 4.12 9.00 1.88 2.94 2.97 Note-3 0.31 0.75 3.00 7.50 8 1.13
3 9.50 1.50 5.00 5.00 3.50 2.12 2.12 4.00 9.00 1.62 3.57 3.60 Note-3 0.38 – 3.63 7.50 8 1.00
4 11.50 1.75 6.19 6.25 4.50 2.75 2.75 4.50 Note-3 1.88 4.57 4.60 Note-3 0.44 – 4.63 9.25 8 1.25
5 13.75 2.00 7.31 7.50 5.56 3.12 3.12 5.00 12.00 2.12 5.66 5.69 Note-3 0.44 – 5.69 11.00 8 1.38
6 15.00 2.19 8.50 9.25 6.63 3.38 3.38 5.50 12.00 2.25 6.72 6.75 Note-3 0.50 – 6.75 12.50 12 1.25
8 18.50 2.50 10.62 11.75 8.63 4.00 4.50 6.38 12.00 2.50 8.72 8.75 Note-3 0.50 – 8.75 15.50 12 1.50
10 21.50 2.75 12.75 14.50 10.75 4.25 5.00 7.25 12.00 2.81 10.88 10.92 Note-3 0.50 – 10.88 18.50 16 1.50
12 24.00 3.12 15.00 16.50 12.75 4.62 5.62 7.88 12.00 3.00 12.88 12.92 Note-3 0.50 – 12.94 21.00 20 1.50
14 25.25 3.38 16.25 17.75 14.00 5.12 6.12 8.38 12.00 3.25 14.14 14.18 Note-3 0.50 – 14.19 22.00 20 1.63
16 27.75 3.50 18.50 20.00 16.00 5.25 6.50 8.50 12.00 3.38 16.16 16.19 Note-3 0.50 – 16.19 24.25 20 1.75
18 31.00 4.00 21.00 22.25 18.00 6.00 7.50 9.00 12.00 3.50 18.18 18.20 Note-3 0.50 – 18.19 27.00 20 2.00
20 33.75 4.25 23.00 24.50 20.00 6.25 8.25 9.75 12.00 3.62 20.20 20.25 Note-3 0.50 – 20.19 29.50 20 2.13
24 41.00 5.50 27.25 29.50 24.00 8.00 10.50 11.50 12.00 4.00 24.25 24.25 Note-3 0.50 – 24.19 35.50 20 2.63

Notes:
(1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges.
(2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.25 in. or the tf dimension thickeness without the raised face height.
(3) To be specified by the Customer; Y4 – the length can be 9″ (B16.5) or 12″ (industry), shall be specified by the customer.

Class 1500 Flange Dimensions in mm

class 1500 flange dimensions in mm
Nominal Pipe Size/ Bore for LWN Outside Diameter Min. Thickness Diameter of Raised Face Diameter of Hub Diameter Beginning of Chamefer Welding Neck Threaded Slip-on Socket Welding Lapped Welding Neck Long Welding Neck Minimum Thread Length Threaded Minimum Slip-On Socket Welding Minimum Lapped Welding Neck / Socket Welding Corner Bore Radius of Lapped Flange and Pipe Depth of Socket Minimum Counter-bore Threaded Flange Bolt Circle Dia Number of Holes Diameter of Holes
J O tf R X A Y1 Y2 Y3 Y4 T B1 B2 B3 r D Q
½ 4.75 0.88 1.38 1.50 0.84 1.25 1.25 2.38 9.00 0.88 0.88 0.90 Note-3 0.12 0.38 0.93 3.25 4 0.88
¾ 5.12 1.00 1.69 1.75 1.05 1.38 1.38 2.75 9.00 1.00 1.09 1.11 Note-3 0.12 0.44 1.14 3.50 4 0.88
1 5.88 1.12 2.00 2.06 1.32 1.62 1.62 2.88 9.00 1.12 1.36 1.38 Note-3 0.12 0.50 1.41 4.00 4 1.00
1¼ 6.25 1.12 2.50 2.50 1.66 1.62 1.62 2.88 9.00 1.19 1.70 1.72 Note-3 0.19 0.56 1.75 4.38 4 1.00
1½ 7.00 1.25 2.88 2.75 1.90 1.75 1.75 3.25 9.00 1.25 1.95 1.97 Note-3 0.25 0.62 1.99 4.88 4 1.13
2 8.50 1.50 3.62 4.12 2.38 2.25 2.25 4.00 9.00 1.50 2.44 2.46 Note-3 0.31 0.69 2.50 6.50 8 1.00
2½ 9.62 1.62 4.12 4.88 2.88 2.50 2.50 4.12 9.00 1.88 2.94 2.97 Note-3 0.31 0.75 3.00 7.50 8 1.13
3 10.50 1.88 5.00 5.25 3.50 – 2.88 4.62 9.00 – – 3.60 Note-3 0.38 – – 8.00 8 1.25
4 12.25 2.12 6.19 6.38 4.50 – 3.56 4.88 Note-3 – – 4.60 Note-3 0.44 – – 9.50 8 1.38
5 14.75 2.88 7.31 7.75 5.56 – 4.12 6.12 12.00 – – 5.69 Note-3 0.44 – – 11.50 8 1.63
6 15.50 3.25 8.50 9.00 6.63 – 4.69 6.75 12.00 – – 6.75 Note-3 0.50 – – 12.50 12 1.50
8 19.00 3.62 10.62 11.50 8.63 – 5.62 8.38 12.00 – – 8.75 Note-3 0.50 – – 15.50 12 1.75
10 23.00 4.25 12.75 14.50 10.75 – 7.00 10.00 12.00 – – 10.92 Note-3 0.50 – – 19.00 12 2.00
12 26.50 4.88 15.00 17.75 12.75 – 8.62 11.12 12.00 – – 12.92 Note-3 0.50 – – 22.50 16 2.13
14 29.50 5.25 16.25 19.50 14.00 – 9.50 11.75 12.00 – – 14.18 Note-3 0.50 – – 25.00 16 2.38
16 32.50 5.75 18.50 21.75 16.00 – 10.25 12.25 12.00 – – 16.19 Note-3 0.50 – – 27.75 16 2.63
18 36.00 6.38 21.00 23.50 18.00 – 10.88 12.88 12.00 – – 18.20 Note-3 0.50 – – 30.50 16 2.88
20 38.75 7.00 23.00 25.25 20.00 – 11.50 14.00 12.00 – – 20.25 Note-3 0.50 – – 32.75 16 3.13
24 46.00 8.00 27.25 30.00 24.00 – 13.00 16.00 12.00 – – 24.25 Note-3 0.50 – – 39.00 16 3.63

Notes:
(1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges.
(2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.25 in. or the tf dimension thickeness without the raised face height.
(3) To be specified by the Customer; Y4 – the length can be 9″ (B16.5) or 12″ (industry), shall be specified by the customer.

Class 2500 Flange Dimensions in mm

class 2500 flange dimensions
Nominal Pipe Size/ Bore for LWN Outside Diameter Min. Thickness Diameter of Raised Face Diameter of Hub Hub Diameter Beginning of Chamefer Welding Neck Threaded Lapped Welding Neck Long Welding Neck Minimum Thread Length Threaded Minimum Lapped Welding Neck Corner Bore Radius of Lapped Flange and Pipe Minimum Counter-bore Threaded Flange Bolt Circle Dia Number of Holes Diameter of Holes
J O tf R X A Y1 Y2 Y3 Y4 T B2 B3 r Q
½ 5.25 1.19 1.38 1.69 0.84 1.56 1.56 2.88 9.00 1.12 0.90 Note-3 0.12 0.93 3.50 4 0.88
¾ 5.50 1.25 1.69 2.00 1.05 1.69 1.69 3.12 9.00 1.25 1.11 Note-3 0.12 1.14 3.75 4 0.88
1 6.25 1.38 2.00 2.25 1.32 1.88 1.88 3.50 9.00 1.38 1.38 Note-3 0.12 1.41 4.25 4 1.00
1¼ 7.25 1.50 2.50 2.88 1.66 2.06 2.06 3.75 9.00 1.50 1.72 Note-3 0.19 1.75 5.12 4 1.13
1½ 8.00 1.75 2.88 3.12 1.90 2.38 2.38 4.38 9.00 1.75 1.97 Note-3 0.25 1.99 5.75 4 1.25
2 9.25 2.00 3.62 3.75 2.38 2.75 2.75 5.00 9.00 2.00 2.46 Note-3 0.31 2.50 6.75 8 1.13
2½ 10.50 2.25 4.12 4.50 2.88 3.12 3.12 5.62 9.00 2.25 2.97 Note-3 0.31 3.00 7.75 8 1.25
3 12.00 2.62 5.00 5.25 3.50 – 3.62 6.62 9.00 – 3.60 Note-3 0.38 – 9.00 8 1.38
4 14.00 3.00 6.19 6.50 4.50 – 4.25 7.50 Note-3 – 4.60 Note-3 0.44 – 10.75 8 1.63
5 16.50 3.62 7.31 8.00 5.56 – 5.12 9.00 12.00 – 5.69 Note-3 0.44 – 12.75 8 1.88
6 19.00 4.25 8.50 9.25 6.63 – 6.00 10.75 12.00 – 6.75 Note-3 0.50 – 14.50 8 2.13
8 21.75 5.00 10.63 12.00 8.63 – 7.00 12.50 12.00 – 8.75 Note-3 0.50 – 17.25 12 2.13
10 26.50 6.50 12.75 14.75 10.75 – 9.00 16.50 12.00 – 10.92 Note-3 0.50 – 21.25 12 2.63
12 30.00 7.25 15.00 17.38 12.75 – 10.00 18.25 12.00 – 12.92 Note-3 0.50 – 24.38 12 2.88

Notes:
(1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges.
(2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height.
(3) To be specified by the Customer; Y4 – the length can be 9″ (B16.5) or 12″ (industry),shall be specified by the customer.

Flanges Weight Chart

Flange weight varies by size, class, and material, with a Class 150 NPS 4 weighing 5.5 kg, while a Class 2500 weighs 45.0 kg; refer to our dedicated weight chart for detailed specifications.
Pipe Normal Diameter (inch)Outer diameter FlangeThickness Of Flange MinimumDiameter
of
Hub		Diameter of Raised FaceLength Hub.YThread LengthDiameter
of Bolt
Circle		Diameter
of Bolt
Holes		Number
of Bolts		Diameter of
Bolts
(inch)		KGLB
1/2″1589.0011.2030.2035.1015.7015.7060.5015.8041/2″0.40.9
3/4″2098.5012.7038.1042.9015.7015.7069.9015.8041/2″0.71.5
1″25108.0014.2049.3050.8017.5017.5079.3015.8041/2″0.81.8
1-1/4″32117.5015.7058.7063.5020.6020.6088.9015.8041/2″1.22.6
1-1/2″40127.0017.5065.0073.2022.4022.4098.6015.8041/2″1.53.3
2″50152.5019.1077.7091.9025.4025.40120.7019.1045/8″2.35.1
2-1/2″65178.0022.4090.40104.6028.4028.40139.7019.1045/8″3.78.1
3″80190.5023.90108.00127.0030.2030.20152.4019.1045/8″4.19
3-1/2″90216.0023.90122.20139.7031.8031.80177.8019.1085/8″5.111.2
4″100228.5023.90134.90157.2033.3033.30190.5019.1085/8″5.913
5″125254.0023.90163.60185.7036.6036.60215.9022.4083/4″715.4
6″150279.5025.40192.00215.9039.6039.60241.3022.4083/4″8.418.5
8″200343.0028.40246.10269.7044.5044.50298.5022.4083/4″1328.6
10″250406.5030.20304.80323.9049.3049.30362.0025.40127/8″1839.5
12″300482.5031.80365.30381.0055.6055.60431.8025.40127/8″2964
14″350533.5035.10400.10412.8057.2057.20476.3028.50121″3986
16″400597.0036.60457.20469.9063.5063.50539.8028.50161″47103
18″450635.0039.60505.00533.4068.3068.30577.9031.80161 1/8″57126
20″500698.5042.90558.80584.2073.2073.20635.0031.80201 1/8″76167
24″600813.0047.80663.40692.2082.6082.60749.3035.10201 1/4″97214

Flange Pressure Rating Chart (ASME B16.5)

The table below shows maximum working pressure (bar) at each temperature for Group 1.1 carbon steel (A105). For stainless steel, duplex, or nickel alloy flanges, refer to the applicable ASME B16.5 material group table.
Temp (°C)
150 300 400 600 900 1500 2500
-29 to 38 19.6 51.1 68.1 102.1 153.2 255.3 425.5
100 17.7 46.6 62.1 93.2 139.8 233.0 388.3
200 13.8 43.8 58.4 87.6 131.4 219.0 365.0
300 10.2 39.8 53.1 79.6 119.5 199.1 331.8
400 6.5 34.7 46.3 69.4 104.2 173.6 289.3

Types of Flanges in Piping

Nicorex Alloys offers a comprehensive range of piping flanges in various types and dimensions to suit your requirements.
Weld Neck Flanges

Weld Neck Flange (WNRF / WNRTJ)

Butt-welded to the pipe, weld neck flanges are the industry standard for high-pressure, critical service, and severe cyclic conditions

duplex-slip-on-flanges

Slip-On Flange (SORF)

Primarily used in low-pressure systems, these fillet-welded flanges offer easy alignment and significant cost savings during installation.

duplex-blind-flanges

Blind Flange (BLRF)

Line termination and pressure testing require a dependable seal, which these bolted systems provide by securely closing off any open piping ends.

Threaded Flanges

Threaded (Screwed) Flange

Ideal for small-bore systems, these NPT-threaded flanges allow for secure assembly without the need for onsite welding.

duplex-socket-weld-flanges

Socket Weld Flange (SWRF)

These fillet-welded flanges for compact, high-pressure pipes exhibit smooth-bore transitions that significantly reduce internal turbulence and the potential for long-term erosion.

duplex-lap-joint-flanges

Lap Joint Flange

Used with stub ends, these allow for easy bolt hole alignment when working with dissimilar metal piping systems.

Nickel Long Neck Weld Flanges

Long Weld Neck (LWN)

These strengthened butt-weld flanges help high-pressure vessels and storage tanks handle the high stresses that come with hefty loads.

hastelloy-orifice-flanges

Orifice Flange (ASME B16.36)

Process systems rely on these butt-weld flanges and their integrated metering taps to achieve the precision required for flow measurement.

Nickel Spectacle Blind Flanges

Spectacle Blind Flange (ASME B16.48)

These bolted safety devices provide a reliable method for permanent or temporary line isolation during system maintenance.

Reducing Flange

Reducing Flange

These allow for a change in pipe size without using a separate reducer, saving space in compact configurations.

Swivel Ring Flange

Swivel Ring Flange

During significant constructions, revolving bolt rings facilitate coordination underwater. Expander flanges resemble standard weld necks, but feature a larger hub designed to accommodate pipes of varying diameters. However, the outlet is larger. These increase pipe size directly at the flange connection point.

Expander Flange

Expander Flange

They resemble weld necks. However, the outlet is larger. These increase pipe size directly at the flange connection point.

Industrial Applications of Pipe Flanges

Nicorex Alloys distributes industrial flanges to EPC contractors and end users across India and internationally.
  • Wellhead connections, pipeline girth joints, and refinery piping use A105 and A350 LF2. Sour service per NACE MR0175 specifies A182 F51/F53 and B564 Inconel 625.
  • Reactor nozzles and acid piping use A182 F316L. Severe service demands B564 Hastelloy C-276 or Alloy 20. Monel 400 handles HF acid.
  • Main steam line flanges use A182 F22/F91 for creep resistance. Nuclear circuits specify B564 Inconel 600 and Incoloy 800H.
  • Seawater systems use copper-nickel 70/30 flanges. FPSO modules and subsea manifolds specify B564 Inconel 625 and A182 F53 super duplex.
  • RO piping and brine lines use F316L or super duplex S32750/S32760. Titanium Grade 2 provides seawater immunity in desalination.
  • Sanitary joints and CIP systems require A182 F304L/F316L. Bleach plant piping specifies B564 Hastelloy C-276.
  • Urea reactors and ammonia piping use F316L and B564 Incoloy 825. Duplex 2205 handles slurry piping in mining.
Industrial Applications

How to Order Flanges from Nicorex Alloys

To place an order for flanges from Nicorex Alloys, please provide the following details:

  • Flange Type: (e.g., Weld Neck, Blind, Slip-On)
  • Size: Nominal Pipe Size (NPS) or Diameter Nominal (DN)
  • Pressure Class: (e.g., Class 150, 300, 600, 900, 1500, 2500)
  • Face Type: (e.g., Raised Face, Flat Face, RTJ)
  • Material Grade / ASTM Spec: (e.g., ASTM A182 F51, F53, F44)
  • Schedule: Pipe wall thickness (e.g., Sch 40S, Sch 80S, Sch XXS)
  • Quantity: Total units required
  • Dimensional Standard: (e.g., ASME B16.5, ASME B16.47, EN 1092-1)
  • Special Requirements: (e.g., NACE MR0175, Charpy Impact Test, PED)
  • Documentation: (e.g., MTC 3.1, MTC 3.2, NDT reports)
  • Packaging / Delivery: (e.g., Sea-worthy wooden crates, anti-rust coating)
Standard sizes ship from Mumbai stock. Non-standard and specialty grades can be provided on request.

Related Products from Nicorex Alloys

Welding Consumables
Round Bars
Sheets and Plates
Fasteners
Pipes & Fittings

Frequently Asked Questions

What are Flanges?
Flanges are forged steel collars that bolt to pipe, valve, or vessel ends. One gasket, two flanges, and bolts form a pressure-tight seal. Flanges allow pipe disassembly for maintenance, hydrostatic testing, and instrument access without cutting.
Flanges connect pipes, valves, pumps, and vessels into bolted piping systems that can be opened for inspection or equipment replacement without welding.

B16.5 covers NPS ½–24 in Class 150–1500; Class 2500 is limited to NPS ½–12. B16.47 covers NPS 26–60, limited to weld neck and blind only.

For Class 900+, RTJ is recommended for metal-to-metal gasket sealing. Class 150–600 uses RF with spiral wound gaskets per ASME B16.20. FF is only for cast iron mating. RTJ and RF are not interchangeable.

Use ASME B16.5 P-T rating tables. Find your material group and max temperature, then read across to the class where the rated pressure exceeds the operating pressure. Example: F316L at 300°C / 30 bar needs a minimum Class 300.
Forged flanges are fatigue-resistant due to aligned grain. Plate flanges are cut from rolled plate. ASME pressure applications require forging. The plate only works for low-pressure AWWA C207.
No. Different bolt circles, hole counts, and rating systems prevent direct interchange. Use a transition flange, or specify one standard per joint.
Weld neck flanges should be used for Class 600+, high-temperature, and severe cyclic joints. The butt weld delivers ~1.5× fatigue life over slip-on fillet welds. ASME B31.3 mandates a weld neck for severe cyclic service.
Pricing of flanges in India depends on grade, size, class, and LME rates. Indicator: SS F316L ₹500–₹15,000/pc; Duplex ₹2,000–₹40,000/pc; Nickel alloys range from ₹5,000 to ₹100,000+. Contact Nicorex with your MTO.
The improper selection of gaskets, improper tightening of bolts, damage to faces, and improper alignment are some of the common causes for leakage. Gaskets should be selected according to ASME B16.20, and torque should be performed in sequence according to ASME PCC-1. The faces should also be inspected.
To select the right flange, match the fluid, temperature, and pressure against ASME B16.5 P-T tables to determine the correct rating and material grade, such as A105 or F316L.
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