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Forge Flange

Hastelloy C276 Forged Flanges, Inconel 625 Forged Flanges, ASME SA182 SS 316 Forged Flanges, ASME SA182 Duplex 2205 Forged Flanges, 2507 Super Duplex Forged Flanges, ASTM A182 SS 304 Forged Flanges.

Industrial,Background,From,Part,Of,Valves,For,Power,,Oil,Or

About Forge Flange

Forging is a method of shaping metal by applying compressive forces with a hammer or press, and the flanges produced in this way are known as forge flanges. Forge flange benefits from this forging method with increased strength, durability, and fatigue resistance.

Carbon steel, stainless steel, and alloy steel are just a few examples of the forge flange materials available. Different types, such as the slip-on, weld-neck, blind, socket-weld, and threaded varieties, are made for different applications.

Oil & gas, petrochemical, power production, water treatment, and other sectors benefit from forge flanges. Their durability and dependability make them perfect for extreme conditions. These are a standard part of fluid and gas transmission systems, used to join together pipes, valves, pumps, and other components. Pipeline construction also relies heavily on forge flanges because they ensure reliable, watertight joints.

The forge flange has various benefits over its competitors. Its increased strength guarantees leak-free connections and shortens downtime. Forged flanges are built to withstand high pressures and temperatures, making them ideal for harsh environments. In addition, they last a long time without breaking down, which cuts down on expenses.

Forge flanges can only function to their full potential if installed correctly and regularly maintained. A leak-free connection requires careful alignment and torqueing of the bolts during installation. Checking for corrosion, wear, or damage as part of a regular inspection and maintenance routine is essential for spotting and fixing any problems as soon as they arise.

When exceptional strength and longevity are required, forge flanges are a safe bet in crucial piping systems. Their superior mechanical qualities, achieved through the forging process, make them well-suited to severe working circumstances. Engineers and people in related fields might benefit from a better understanding of forge flanges by learning about their features, uses, and advantages.


Flanges are used extensively in industrial settings to connect pipes, valves, and other pieces of machinery. The blind flange is specialized among the many other flange options. The end of a pipe or vessel can be sealed with a blind flange, sometimes called a blank flange. Blind flanges, in contrast to other flanges, are meant to prevent the passage of liquids and gases. As the name implies, they seal off the end of a pipe or fitting.


Carbon steel, stainless steel, alloy steel, and other types of steel are only some of the options for manufacturing blind flanges. They are available in a range of diameters and pressure ratings to match a variety of pipe configurations. Blind flanges can be made to meet the requirements of international specifications like ASME, ASTM, or DIN.

UNS N06625 Forged Flanges Exporter, UNS N08904 Forged Flanges Exporter, DIN 1.4301 Forged Flanges Stockist, ASME SA182 Duplex 2205 Forged Flanges Stockist.

Specification of Forge Flange

StandardsANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
Size Chart1/2" (15 NB) to 48" (1200NB) DN10~DN5000
 Pressure Calculation in DIN6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 Forged Flanges
Pressure Rating ANSIClass 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS Forged Flanges
UNI6Bar 10Bar 16Bar 25Bar 40Bar Forged Flanges
JIS5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K Forged Flanges
CoatingOil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized Forged Flanges
EN6Bar 10Bar 16Bar 25Bar 40Bar Forged Flanges
Types of Forged FlangesForged / Threaded / Screwed / Plate
Connect Type/ Flange Face TypeRaised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove

Dimensions Standard Of Forge Flange

Class 150 Forged Flanges Dimensions

Normal Pipe Size (NPS)OTTJRX#/Diameter of HolesDiameter Of Bolt CircleBB2bB3HLL2L3cRDThr
½3.500.380.441.381.194-0.622.380.880.620.900.840.561.810.620.120.380.62
¾3.880.440.501.691.504-0.622.751.090.821.111.050.562.000.620.120.440.62
14.250.500.562.001.944-0.623.121.361.051.381.320.622.120.690.120.500.69
4.620.560.622.502.314-0.623.501.701.381.721.660.752.190.810.190.560.81
5.000.620.692.882.564-0.623.881.951.611.971.900.812.380.880.250.620.88
26.000.690.753.623.064-0.754.752.442.072.462.380.942.441.000.310.691.00
7.000.810.884.123.564-0.755.502.942.472.972.881.062.691.120.310.751.12
37.500.880.945.004.254-0.756.003.573.073.603.501.122.691.190.380.811.19
8.500.880.945.504.818-0.757.004.073.554.104.001.192.751.250.380.881.25
49.000.880.946.195.318-0.757.504.574.034.604.501.252.941.310.440.941.31
510.000.880.947.316.448-0.888.505.665.055.695.561.383.441.440.440.941.44
611.000.941.008.507.568-0.889.506.726.076.756.631.503.441.560.501.061.56
813.501.061.1210.629.698-0.8811.758.727.988.758.631.693.941.750.501.251.75
1016.001.121.1912.7512.0012-1.0014.2510.8810.0210.9210.751.883.941.940.501.311.94
1219.001.191.2515.0014.3812-1.0017.0012.8812.0012.9212.752.124.442.190.501.562.19
1421.001.311.3816.2515.7512-1.1218.7514.1413.2514.1814.002.194.943.120.501.632.25
1623.501.381.4418.5018.0016-1.1221.2516.1615.2516.1916.002.444.943.440.501.752.50
1825.001.501.5621.0019.8816-1.2522.7518.1817.2518.2018.002.625.443.810.501.942.69
2027.501.621.6923.0022.0020-1.2525.0020.2019.2520.2520.002.815.624.060.502.132.88
2229.501.751.8125.2524.2520-1.3827.2522.2221.2522.2522.003.075.824.250.502.383.13
2432.001.811.8827.2526.1220-1.3829.5024.2523.2524.2524.003.195.944.380.502.503.25

Class 300 Forged Flanges Dimensions

Normal Pipe Size (NPS)OTTJRX#/Diameter of HolesDiameter Of Bolt CircleBB2bB3HLL2L3cRCDThr
½3.750.500.561.381.504-0.632.620.880.620.900.840.812.000.880.120.930.380.62
¾4.620.560.621.691.884-0.753.251.090.821.111.050.942.191.000.121.140.440.62
14.880.620.692.002.124-0.753.501.361.051.381.321.002.381.060.121.410.500.69
5.250.690.752.502.504-0.753.881.701.381.721.661.002.501.060.191.750.560.81
6.120.750.812.882.754-0.884.501.951.611.971.901.132.631.190.251.980.620.88
26.500.810.883.623.318-0.755.002.442.072.462.381.252.691.310.312.500.691.12
7.500.941.004.123.948-0.885.882.942.472.972.881.442.941.500.313.000.751.25
38.251.061.125.004.628-0.886.623.573.073.603.501.633.061.690.383.630.811.25
9.001.121.195.505.258-0.887.254.073.554.104.001.693.131.750.384.13 1.44
410.001.191.256.195.758-0.887.884.574.034.604.501.823.321.880.444.63 1.44
511.001.311.387.317.008-0.889.255.665.055.695.561.943.822.000.445.69 1.69
612.501.381.448.508.1212-0.8810.626.726.076.756.632.003.822.060.506.75 1.81
815.001.561.6210.6210.2512-1.0013.008.727.988.758.632.384.322.440.508.75 2.00
1017.501.811.8812.7512.6216-1.1215.2510.8810.0210.9210.752.564.563.750.5010.88 2.19
1220.501.942.0015.0014.7516-1.2517.7512.8812.0012.9212.752.825.064.000.5012.94 2.38
1423.002.062.1216.2516.7520-1.2520.2514.1413.2514.1814.002.945.564.380.5014.19 2.50
1625.502.192.2518.5019.0020-1.3822.5016.1615.2516.1916.003.195.694.750.5016.19 2.69
1828.002.312.3821.0021.0024-1.3824.7518.1817.2518.2018.003.446.195.120.5018.19 2.75
2030.502.442.5023.0023.1224-1.3827.0020.2019.2520.2520.003.696.325.500.5020.19 2.88
2233.002.572.6325.2525.2524-1.6329.2522.2221.2522.2522.003.936.435.750.5022.19 3.13
2436.002.692.7527.2527.6224-1.6332.0024.2523.2524.2524.004.136.566.000.5024.19 3.25

Class 400 Forged Flanges Dimensions

Normal Pipe Size (NPS)OTRX#/Diameter of HolesDiameter Of Bolt CircleBB3HLL2L3crCDThr
½3.750.561.381.54-0.632.620.880.90.840.882.060.880.120.930.380.62
¾4.620.621.691.884-0.753.251.091.111.0512.2510.121.140.440.62
14.880.6922.124-.0753.51.361.381.321.062.441.060.121.410.50.69
5.250.812.52.54-0.753.881.71.721.661.122.621.120.191.750.560.81
6.120.882.882.754-0.884.51.951.971.91.252.751.250.251.990.620.88
26.513.623.318-0.7552.442.462.381.442.881.440.312.50.691.12
7.51.124.123.948-0.885.882.942.972.881.623.121.620.3130.751.25
38.251.2554.628-0.886.623.573.63.51.813.251.810.383.630.811.38
91.385.55.258-1.007.254.074.141.943.381.940.384.13 1.56
4101.386.195.758-1.007.884.574.64.523.520.444.63 1.44
5111.57.3178-1.009.255.665.695.562.1242.120.445.69 1.69
612.51.628.58.1212-1.0010.626.726.756.632.254.062.250.56.75 1.81
8151.8810.6210.2512-1.12138.728.758.632.694.622.690.58.75 2
1017.52.1212.7512.6216-1.2515.2510.8810.9210.752.884.8840.510.88 2.19
1220.52.251514.7516-1.3817.7512.8812.9212.753.125.384.250.512.94 2.38
14232.3816.2516.7520-1.3820.2514.1414.18143.315.884.620.514.19 2.5
1625.52.518.51920-1.5022.516.1616.19163.69650.516.19 2.69
18282.62212124-1.5024.7518.1818.2183.886.55.380.518.19 2.75
2030.52.752323.1224-1.622720.220.252046.625.750.520.19 2.88
22332.8825.2525.2524-1.7529.2522.2222.25224.256.7560.5  --
2436327.2527.6224-1.883224.2524.25244.56.886.250.524.19 3.25

Class 600 Forged Flanges Dimensions

Normal Pipe Size (NPS)OTRX#/Diameter of HolesDiameter Of Bolt CircleBB3HLL2L3crCDThr
½3.750.561.381.54-0.632.620.880.90.840.882.060.880.120.930.380.62
¾4.620.621.691.884-0.753.251.091.111.0512.2510.121.140.440.62
14.880.6922.124-0.753.51.361.381.321.062.441.060.121.410.50.69
5.250.812.52.54-0.753.881.71.721.661.122.621.120.191.750.560.81
6.120.882.882.754-0.884.51.951.971.91.252.751.250.251.990.620.88
26.513.623.318-0.7552.442.462.381.442.881.440.312.50.691.12
7.51.124.123.948-0.885.882.942.972.881.623.121.620.3130.751.25
38.251.2554.628-0.886.623.573.63.51.813.251.810.383.630.811.38
91.385.55.258-1.007.254.074.141.943.381.940.384.13 1.56
410.751.56.1968-1.008.54.574.64.52.1242.120.444.63 1.62
5131.757.317.448-1.1210.55.665.695.562.384.52.380.445.69 1.88
6141.888.58.7512-1.1211.56.726.756.632.624.622.620.56.75 2
816.52.1910.6210.7512-1.2513.758.728.758.6335.2530.58.75 2.25
10202.512.7513.516-1.381710.8810.9210.753.3864.380.510.88 2.56
12222.621515.7520-1.3819.2512.8812.9212.753.626.124.620.512.94 2.75
1423.752.7516.251720-1.5020.7514.1414.18143.696.550.514.19 2.88
1627318.519.520-1.6323.7516.1616.19164.1975.50.516.19 3.06
1829.253.252121.520-1.7525.7518.1818.2184.627.2560.518.19 3.12
20323.5232424-1.7528.520.220.252057.56.50.520.19 3.25
2234.253.7525.2526.2524-1.7530.6322.2222.25225.257.756.880.5  --
2437427.2528.2524-2.003324.2524.25245.587.250.524.19 3.62

Class 900 Forged Flanges Dimensions

Normal Pipe Size (NPS)OTRX#/Diameter of HolesDiameter Of Bolt CircleBB3HLL2L3crCThr
39.51.5558-1.007.53.573.63.52.1242.120.383.631.62
411.51.756.196.258-1.259.254.574.64.52.754.52.750.444.631.88
513.7527.317.58-1.38115.665.695.563.1253.120.445.692.12
6152.198.59.2512-1.2512.56.726.756.633.385.53.380.56.752.25
818.52.510.6311.7512-1.5015.58.728.758.6346.384.50.58.752.5
1021.52.7512.7514.516-1.5018.510.8810.9210.754.257.2550.510.882.81
12243.121516.520-1.502112.8812.9212.754.637.885.620.512.943
1425.253.3816.2517.7520-1.632214.1414.18145.128.386.120.514.193.25
1627.753.518.52020-1.7524.2516.1616.19165.258.56.50.516.193.38
183142122.2520-2.002718.1818.218697.50.518.193.5
2033.754.252324.520-2.1329.520.220.25206.259.758.250.520.193.62
24415.527.2529.520-2.6335.524.2524.2524811.510.50.524.194

Class 1500 Forged Flanges Dimensions

Normal Pipe Size (NPS)OTRX#/Diameter of HolesDiameter Of Bolt CircleBB3HLL2L3crCDThr
½4.750.881.381.54-0.883.250.880.90.841.252.381.250.120.930.380.88
¾5.1211.691.754-0.883.51.091.111.051.382.751.380.121.140.441
15.881.1222.064-1.0041.361.381.321.622.881.620.121.410.51.12
6.251.122.52.54-1.004.381.71.721.661.622.881.620.191.750.561.19
71.252.882.754-1.124.881.951.971.91.753.251.750.251.990.621.25
28.51.53.634.128-1.006.52.442.462.382.2542.250.312.50.691.5
9.621.624.134.888-1.127.52.942.972.882.54.122.50.3130.751.88
310.51.8855.258-1.258 3.63.5 4.622.880.38   
412.252.126.196.388-1.389.5 4.64.5 4.883.560.44   
514.752.887.317.758-1.6311.5 5.695.56 6.124.120.44   
615.53.258.5912-1.5012.5 6.756.63 6.754.690.5   
8193.6210.6311.512-1.7515.5 8.758.63 8.385.620.5   
10234.2512.7514.512-2.0019 10.9210.75 1070.5   
1226.54.881517.7516-2.1222.5 12.9212.75 11.128.620.5   
1429.55.2516.2519.516-2.3825 14.1814 11.759.50.5   
1632.55.7518.521.7516-2.6327.75 16.1916 12.2510.250.5   
18366.382123.516-2.8830.5 18.218 12.8810.880.5   
2038.7572325.2516-3.1232.75 20.2520 1411.50.5   
2446827.253016-3.6339 24.2524 16130.5   

Class 2500 Forged Flanges Dimensions

Normal Pipe Size (NPS)OTRX#/Diameter of HolesDiameter Of Bolt CircleB3HLL2L3rCThr
½5.251.191.381.694-0.883.50.90.841.562.881.560.120.931.12
¾5.51.251.6924-0.883.751.111.051.693.121.690.121.141.25
16.251.3822.254-1.004.251.381.321.883.51.880.121.411.38
7.251.52.52.884-1.125.131.721.662.063.752.060.191.751.5
81.752.883.124-1.255.751.971.92.384.382.380.251.991.75
29.2523.633.758-1.126.752.462.382.7552.750.312.52
10.52.254.134.58-1.257.752.972.883.125.623.120.3132.25
3122.6255.258-1.3893.63.5 6.623.620.38  
41436.196.58-1.6310.754.64.5 7.54.250.44  
516.53.627.3188-1.8812.755.695.56 95.120.44  
6194.258.59.258-2.1214.56.756.63 10.7560.5  
821.75510.631212-2.1217.258.758.63 12.570.5  
1026.56.512.7514.7512-2.6321.2510.9210.75 16.590.5  
12307.251517.3812-2.8824.3812.9212.75 18.25100.5  

Size Of Forge Flange

NPS (Normal Pipe Sizes)Outside Daimeter (O.D.)Schedule 10Schedule 20Schedule 30Schedule 40Schedule 60Schedule 80Schedule 100Schedule 120Schedule 140Schedule 160
½0.840.083......0.109...0.147.........0.188
¾1.050.083......0.113...0.154.........0.219
11.3150.109......0.133...0.179.........0.25
1 ¼1.660.109......0.14...0.191.........0.25
1 ½1.90.109......0.145...0.2.........0.281
22.3750.109......0.154...0.218.........0.344
2 ½2.8750.12......0.203...0.276.........0.375
33.50.12......0.216...0.3.........0.438
3 ½40.12......0.226...0.318............
44.50.12......0.237...0.337...0.438...0.531
55.5630.134......0.258...0.375...0.5...0.625
66.6250.134......0.28...0.432...0.562...0.719
88.6250.1480.250.2770.3220.4060.50.5940.7190.8120.906
1010.750.1650.250.3070.3650.50.5940.7190.84411.125
1212.750.180.250.330.4060.5620.6880.84411.1251.312
14140.250.3120.3750.4380.5940.750.9381.0941.251.406
16160.250.3120.3750.50.6560.8441.0311.2191.4381.594
18180.250.3120.4380.5620.750.9381.1561.3751.5621.781
20200.250.3750.50.5940.8121.0311.2811.51.751.969
22220.25..............................
24240.250.3750.5620.6880.9691.2191.5311.8122.0622.344
2626........................................
30300.3120.50.625............................
36360.3120.50.6250.75........................
4040........................................
4242……..……..……..……..……..……..……..……..……..……..
4848……..……..……..……..……..……..……..……..……..……..

Weight Chart Of Forge Flange

DN In inchesDimension125 LBS
150 LBS
300 LBS400 LBS600 LBS900 LBS1500 LBS2500 LBS
inchmm inchmm inchmm inchmm inchmm inchmm inchmm
1/2A3 1/288.93 3/495.23 3/495.23 3/495.24 3/41214 3/41215 1/4133.4
b7/1611.19/1614.39/1614.39/1614.37/822.27/822.21 3/1630.2
D21 3/834.91 3/834.91 3/834.91 3/834.91 3/834.91 3/834.91 3/834.9
D12 3/860.32 5/866.72 5/866.72 5/866.73 1/482.63 1/482.63 1/288.9
n44444444444-444
d5/815.95/815.95/815.95/815.97/822.27/822.27/822.2
3/4A3 7/898.44 5/8117.54 5/8117.54 5/8117.55 1/81305 1/81305 1/2139.7
b1/212.75/815.95/815.95/815.9125.4125.41 1/431.8
D21 11/1642.91 11/1642.91 11/1642.91 11/1642.91 11/1642.91 11/1642.91 11/1642.9
D12 3/469.83 1/482.53 1/482.53 1/482.53 1/288.93 1/288.93 3/495.2
n44444444444-444
d5/815.93/4193/4193/4197/822.27/822.27/822.2
1A4 1/41084 7/8123.84 7/8123.84 7/8123.85 7/8149.25 7/8149.26 1/4159
b9/1614.311/1617.511/1617.511/1617.51 1/828.61 1/828.61 3/834.9
D2250.8250.8250.8250.8250.8250.8250.8
D13 1/879.43 1/288.93 1/288.93 1/288.9410241024 1/4108
n44444444444444
d5/815.93/4193/4193/419125.4125.4125.4
1 1/4A4 5/8117.55 1/4133.45 1/4133.45 1/4133.46 1/41596 1/41597 1/4184.2
b5/815.93/41913/1620.613/1620.61 1/828.61 1/828.61 1/238.1
D22 1/263.52 1/263.52 1/263.52 1/263.52 1/263.52 1/263.52 1/263.5
D13 1/288.93 7/898.43 7/898.43 7/898.44 3/81114 3/81115 1/8130
n44444444444444
d5/815.93/4193/4193/419125.4125.41 1/828.6
1 1/2A51276 1/8155.66 1/8155.66 1/8155.67177.87177.88203
b11/1617.513/1620.67/822.27/822.21 1/431.81 1/431.81 3/444.5
D22 7/873 982 7/8732 7/8732 7/8732 7/8732 7/8732 7/873
D13 7/844 1/21144 1/21144 1/21144 7/81244 7/81245 3/4146
n444
44444444444
d5/8. 15.97/822.27/822.27/822.21 1/828.61 1/828.61 1/431.8
2A6152.46 1/2165.16 1/2165.16 1/2165.18 1/2215.98 1/2215.99 1/4234.9
b3/4197/822.2125.4125.41 1/238.11 1/238.1250.8
D23 5/892.13 5/892.13 5/892.13 5/892.13 5/892.13 5/892.13 5/892.1
D14 3/41215127512751276 1/2165.16 1/2165.16 3/4171
n44888888888888
d3/4193/4193/4193/419125.4125.41 1/828.6
2 1/2A7177.87 1/2190.57 1/2190.57 1/2190.59 5/82449 5/824410 1/2266.7
b7/822.2125.41 1/828.61 1/828.61 5/841.31 5/841.32 1/457.2
D24 1/8104.84 1/8104.84 1/8104.84 1/8104.84 1/81054 1/81054 1/8105
D15 1/2139.75 7/8149.25 7/8149.25 7/8149.27 1/2190.57 1/2190.57 3/4197
n44888888888888

Pressure Rating Of Forge Flange

Flanges pressure rating in psig for Forged Flange ASME
Temperature (F°)150#300#400#600#900#1500#2500#
-20 to 1002857409851480222037056170
2002606809051360203533955655
3002306558701310196532705450
4002006358451265190031705280
5001706058051205181030155025
6001405707551135170528404730
6501255507301100165027454575
7001105307101060159026554425
750955056751015152025354230
80080410550825123520553430
8506532042564095515952655
9005023030546069011501915
950351351852754106851145
10002085115170255430715

Price Of Forge Flange

Stainless Steel FlangesUSD $2.05 - $10.06 / Piece (FOB Price) on request
High Nickel Alloys FlangesUSD $8.10 - $20.20 / Piece (FOB Price) on request
Duplex & Super Duplex FlangeUSD $10.20 - $35.50 / Piece (FOB Price) on request
Cupro Nickel FlangesUSD $5.19 - $10.48 / Piece (FOB Price) on request
Carbon Steel FlangesUSD $2.08 - $7.10 / Piece (FOB Price) on request

Application Of Forge Flange

We make sure that our every product is made of high quality raw material. We thoroughly test each and every product before dispatching it to our customers.

Testing Of Forge Flange

We known for its accurate and perfect dimensions. We thoroughly test all our products before shipping them to the customers. We carry out destructive as well as non-destructive tests on all our products.

Packing Of Forge Flange

We uses the most safest and the most effective ways of packaging for all types of deliveries. We pack our goods in various ways such as: