ASME/ANSI B16.5, B16.47 Flange

Industrial Pipe Flange Manufacturers |ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092

ASME/ANSI B16.5 and B16.47 are key standards for pipe flanges and flanged fittings used in various industries. ASME/ANSI B16.5 covers pipe flanges and flanged fittings from 1/2" to 24" nominal pipe sizes for classes ranging from 150 to 2500. These flanges are widely used for connecting pipes, valves, pumps, and other equipment in industries like oil and gas, petrochemicals, and power plants.

ASME/ANSI B16.47, on the other hand, applies to larger-diameter flanges ranging from 26" to 60" and is divided into two series: Series A (formerly MSS SP-44) for higher strength and heavier applications, and Series B (formerly API 605) for lighter and more compact designs. Both standards ensure reliability, safety, and compatibility in high-pressure and high-temperature applications.

Ample Alloys is a leading manufacturer and supplier of high-quality industrial flanges, catering to diverse industries worldwide. With a focus on precision and durability, the company offers a comprehensive range of flanges, including ASME, ANSI, DIN, and custom designs, crafted from premium materials such as carbon steel, stainless steel, and alloys. Known for its commitment to excellence, Ample Alloys ensures all products meet stringent quality standards, providing reliable solutions for oil and gas, petrochemical, power generation, and construction industries.

ASME/ANSI B16.5, B16.47 Flange

ASME Flange, ANSI Flange, DIN Flange, EN 1092-1 Flange, Stainless Steel Flange, Carbon Steel Flange, Alloy Steel Flange, High-Pressure Flange, Customized Flange, Forged Flange, Large-Diameter Flanges

ASME/ANSI B16.5 Flange

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Flange Face Type

FF—Flat Face, RF—Raised Face, FM—Female Face, M—Male Face, T—Tongue Face, G—Groove Face, RJ—Ring Joint.

Stainless Steel

ASTM A182 F 304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.

Standards / Dimension

ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN

Carbon Steel

ASTM A105/A105N (SA105N), LTCS A350 LF2, A694

Alloy Steel

ASTM A182 / SA182 - F1 / F5 / F9 / F11 / F12 / F22 / F91

Pressure Class

150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64.

Duplex & Super Duplex

ASTM A182 / ASME SA182 - S31803, S32205, 2205, S32750, S32760, S32950, 2507.

MTC

EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103

ASME/ANSI B16.5, B16.47 Flange Dimensions

ANSI B 16.5 Class 150 flange dimensions in MM

Nominal
Pipe Size		 Flange
Dia
‘O’		 Dia of
Bolt Circle
‘A’		 Dia of Bolt Holes
‘D’		 No. of
Holes		 Thickness of Flange
‘C’		 Diameter at Weld Bevel Dia of Hub
‘E’		 Length Through Hub Bore ‘B’ Dia of
R/F
R		 Depth of
Socket
F		 Length
of
Threading
S/O & S/W
Y		 W/N
Y		 L/J
Y		 S/O & S/W
B		 L/J
B
1/2” 15 88.9 60.3 15.9 4 11.1 21.3 30.2 15.9 47.6 15.9 22.3 22.9 34.9 9.5 15.9
3/4” 20 98.4 69.8 15.9 4 12.7 26.7 38.1 15.9 52.4 15.9 27.7 28.2 42.9 11.1 15.9
1” 25 107.9 79.4 15.9 4 14.3 33.5 49.2 17.5 55.6 17.5 34.5 35.0 50.8 12.7 17.5
1 ¼” 32 117.5 88.9 15.9 4 15.9 42.2 58.7 20.6 57.1 20.6 43.2 43.7 63.5 14.3 20.6
1 ½” 40 127.0 98.4 15.9 4 17.5 48.3 65.1 22.2 61.9 22.2 49.5 50.0 73.0 15.9 22.2
2” 50 152.4 120.6 19.0 4 19.0 60.4 77.8 25.4 63.5 25.4 62.0 62.5 92.1 17.5 25.4
2 ½” 65 177.8 139.7 19.0 4 22.2 73.1 90.5 28.6 69.8 28.6 74.7 75.4 104.8 19.0 28.6
3” 80 190.5 152.4 19.0 4 23.8 88.9 107.9 30.2 69.8 30.2 90.7 91.4 127.0 20.6 30.2
3 ½” 90 216.0 177.8 19.0 8 23.8 101.6 122.2 31.7 71.4 31.7 103.4 104.1 140.0 20.6 31.7
4” 100 228.6 190.5 19.0 8 23.8 114.3 134.9 33.3 76.2 33.3 116.1 116.8 157.2 23.8 33.3
5” 125 254.0 215.9 22.2 8 23.8 141.2 163.5 36.5 88.9 36.5 143.8 144.5 185.7 23.8 36.5
6” 150 279.4 241.3 22.2 8 25.4 168.4 192.1 39.7 88.9 39.7 170.7 171.4 215.9 27.0 39.7
8” 200 342.9 298.4 22.2 8 28.6 219.2 246.1 44.4 101.6 44.4 221.5 222.2 269.9 31.7 44.4
10” 250 406.4 361.9 25.4 12 30.2 273.0 304.8 49.2 101.6 49.2 276.3 277.4 323.8 33.3 49.2
12” 300 482.6 431.8 25.4 12 31.8 323.8 365.1 55.6 114.3 55.6 327.1 328.2 381.0 39.7 55.6
14” 350 533.4 476.2 28.6 12 34.9 355.6 400.0 57.1 127.0 79.4 359.1 360.2 412.7 41.3 57.1
16” 400 596.9 539.7 28.6 16 36.5 406.4 457.2 63.5 127.0 87.3 410.5 411.2 469.9 44.4 63.5
18” 450 635.0 577.8 31.7 16 39.7 457.2 504.8 68.3 139.7 96.8 461.8 462.3 533.4 49.2 68.3
20” 500 698.5 635.0 31.7 20 42.9 508.0 558.8 73.0 144.5 103.2 513.1 514.3 584.2 54.0 73.0
24” 600 812.8 749.3 34.9 20 47.6 609.6 663.6 82.5 152.4 111.1 615.9 615.9 692.1 63.5 82.5

ANSI B 16.5 Class 300 flange dimensions in MM

ANSI B 16.5 DIMENSIONS OF CLASS 300 FLANGES in mm
Nominal
Pipe Size		 Flange
Dia
‘O’		 Dia of
Bolt Circle
‘A’		 Dia of Bolt Holes
‘D’		 No. of
Holes		 Thickness of Flange
‘C’		 Diameter at Weld Bevel Dia of Hub
‘E’		 Length Through Hub Bore ‘B’ Dia of
R/F
R		 Depth of
Socket
F		 Length
of
Threading
S/O & S/W
Y		 W/N
Y		 L/J
Y		 S/O & S/W
B		 L/J
B
1/2” 15 95.2 66.7 15.9 4 14.3 21.3 38.1 22.2 52.4 22.2 22.3 22.9 34.9 9.5 15.9
3/4” 20 117.5 82.5 19.0 4 15.9 26.7 47.6 25.4 57.1 25.4 27.7 28.2 42.9 11.1 15.9
1” 25 123.8 88.9 19.0 4 17.5 33.5 54.0 27.0 61.9 27.0 34.5 35.0 50.8 12.7 17.5
1 ¼” 32 133.3 98.4 19.0 4 19.0 42.2 63.5 27.0 65.1 27.0 43.2 43.7 63.5 14.3 20.6
1 ½” 40 155.6 114.3 22.2 4 20.6 48.3 69.8 30.2 68.3 30.2 49.5 50.0 73.0 15.9 22.2
2” 50 165.1 127.0 19.0 8 22.2 60.4 84.1 33.3 69.8 33.3 62.0 62.5 92.1 17.5 25.4
2 ½” 65 190.5 149.2 22.2 8 25.4 73.1 100.0 38.1 76.2 38.1 74.7 75.4 104.8 19.0 28.6
3” 80 209.5 168.3 22.2 8 28.6 88.9 117.5 42.9 79.4 42.9 90.7 91.4 127.0 20.6 30.2
3 ½” 90 228.5 184.2 22.2 8 30.2 101.6 133.4 44.5 81.0 44.5 103.4 104.1 140.0 20.6 31.7
4” 100 254.0 200.0 22.2 8 31.8 114.3 146.0 47.6 85.7 47.6 116.1 116.8 157.2 23.8 33.3
5” 125 279.4 234.9 22.2 8 34.9 141.2 177.8 50.8 98.4 50.8 143.8 144.5 185.7 – 36.5
6” 150 317.5 269.9 22.2 12 36.5 168.4 206.4 52.4 98.4 52.4 170.7 171.4 215.9 – 39.7
8” 200 381.0 330.2 25.4 12 41.3 219.2 260.3 61.9 111.1 61.9 221.5 222.2 269.9 – 44.4
10” 250 444.5 387.3 28.6 16 47.6 273.0 320.7 66.7 117.5 95.2 276.3 277.4 323.8 – 49.2
12” 300 520.7 450.8 31.7 16 50.8 323.8 374.6 73.0 130.2 101.6 327.1 328.2 381.0 – 55.6
14” 350 584.2 514.3 31.7 20 54.0 355.6 425.4 76.2 142.9 111.1 359.1 360.2 412.7 – 57.1
16” 400 647.7 571.5 34.9 20 57.2 406.4 482.6 82.5 146.0 120.6 410.5 411.2 469.9 – 63.5
18” 450 711.2 628.5 34.9 24 60.3 457.2 533.4 88.9 158.7 130.2 461.8 462.3 533.4 – 68.3
20” 500 774.7 685.8 34.9 24 63.5 508.0 587.4 95.2 161.9 139.7 513.1 514.3 584.2 – 73.0
24” 600 914.4 812.8 41.3 24 69.8 609.6 701.7 106.4 168.3 152.4 615.9 615.9 692.1 – 82.5

ANSI B 16.5 Class 600 flange dimensions in MM

ANSI B 16.5 Class 600 flange dimensions in mm
Nominal
Pipe Size		 Flange
Dia
‘O’		 Dia of
Bolt Circle
‘A’		 Dia of Bolt Holes
‘D’		 No. of
Holes		 Thickness of Flange
‘C’		 Diameter at Weld Bevel Dia of Hub
‘E’		 Length Through Hub Bore ‘B’ Dia of
R/F
R		 Depth of
Socket
F		 Length
of
Threading
S/O & S/W
Y		 W/N
Y		 L/J
Y		 S/O & S/W
B		 L/J
B
1/2” 15 95.2 66.7 15.9 4 14.3 21.3 38.1 22.2 52.4 22.2 22.3 22.9 34.9 9.5 15.9
3/4” 20 117.5 82.5 19.0 4 15.9 26.7 47.6 25.4 57.1 25.4 27.7 28.2 42.9 11.1 15.9
1” 25 123.8 88.9 19.0 4 17.5 33.5 54.0 27.0 61.9 27.0 34.5 35.0 50.8 12.7 17.5
1 ¼” 32 133.3 98.4 19.0 4 20.6 42.2 63.5 28.6 66.7 28.6 43.2 43.7 63.5 14.3 20.6
1 ½” 40 155.6 114.3 22.2 4 22.2 48.3 69.8 31.7 69.8 31.7 49.5 50.0 73.0 15.9 22.2
2” 50 165.1 127.0 19.0 8 25.4 60.4 84.1 36.5 73.0 36.5 62.0 62.5 92.1 17.5 25.4
2 ½” 65 190.5 149.2 22.2 8 28.6 73.1 100.0 41.3 79.4 41.3 74.7 75.4 104.8 19.0 28.6
3” 80 209.5 168.3 22.2 8 31.8 88.9 117.5 46.0 82.5 46.0 90.7 91.4 127.0 – 30.2
3 ½” 90 228.5 184.2 22.2 8 34.9 101.6 133.4 49.3 85.7 49.3 103.4 104.1 140.0 – 31.7
4” 100 273.0 215.9 25.4 8 38.1 114.3 152.4 54.0 101.6 54.0 116.1 116.8 157.2 – 33.3
5” 125 330.2 266.7 28.6 8 44.4 141.2 188.9 60.3 114.3 60.3 143.8 144.5 185.7 – 36.5
6” 150 355.6 292.1 28.6 12 47.6 168.4 222.2 66.7 117.5 66.7 170.7 171.4 215.9 – 39.7
8” 200 419.1 349.2 31.7 12 55.6 219.2 273.0 76.2 133.3 76.2 221.5 222.2 269.9 – 44.4
10” 250 508.0 431.8 34.9 16 63.5 273.0 342.9 85.7 152.4 111.2 276.3 277.4 323.8 – 49.2
12” 300 558.8 488.9 34.9 20 66.7 323.8 400.0 92.1 155.6 117.3 327.1 328.2 381.0 – 55.6
14” 350 603.2 527.0 38.1 20 69.9 355.6 431.8 93.7 165.1 127.0 359.1 360.2 412.7 – 57.1
16” 400 685.8 603.2 41.3 20 76.2 406.4 495.3 106.4 177.8 139.7 410.5 411.2 469.9 – 63.5
18” 450 742.9 654.0 44.4 24 82.6 457.2 546.1 117.5 184.1 152.4 461.8 462.3 533.4 – 68.3
20” 500 812.8 723.9 44.4 24 88.9 508.0 609.6 127.0 190.5 165.1 513.1 514.3 584.2 – 73.0
24” 600 939.8 838.2 50.8 24 101.6 609.6 717.5 139.7 203.2 184.1 615.9 615.9 692.1 – 82.5

ANSI B 16.5 Class 900 flange dimensions in MM

ANSI B 16.5 Class 900 flange dimensions in mm
Nominal
Pipe Size		 Flange
Dia
‘O’		 Dia of
Bolt Circle
‘A’		 Dia of Bolt Holes
‘D’		 No. of
Holes		 Thickness of Flange
‘C’		 Diameter at Weld Bevel Dia of Hub
‘E’		 Length Through Hub Bore ‘B’ Dia of
R/F
R		 Depth of
Socket
F		 Length
of
Threading
S/O & S/W
Y		 W/N
Y		 L/J
Y		 S/O & S/W
B		 L/J
B
1/2” 15 95.2 66.7 15.9 4 14.3 21.3 38.1 22.2 52.4 22.2 22.3 22.9 34.9 9.5 15.9
3/4” 20 117.5 82.5 19.0 4 15.9 26.7 47.6 25.4 57.1 25.4 27.7 28.2 42.9 11.1 15.9
1” 25 123.8 88.9 19.0 4 17.5 33.5 54.0 27.0 61.9 27.0 34.5 35.0 50.8 12.7 17.5
1 ¼” 32 133.3 98.4 19.0 4 20.6 42.2 63.5 28.6 66.7 28.6 43.2 43.7 63.5 14.3 20.6
1 ½” 40 155.6 114.3 22.2 4 22.2 48.3 69.8 31.7 69.8 31.7 49.5 50.0 73.0 15.9 22.2
2” 50 165.1 127.0 19.0 8 25.4 60.4 84.1 36.5 73.0 36.5 62.0 62.5 92.1 17.5 25.4
2 ½” 65 190.5 149.2 22.2 8 28.6 73.1 100.0 41.3 79.4 41.3 74.7 75.4 104.8 19.0 28.6
3” 80 209.5 168.3 22.2 8 31.8 88.9 117.5 46.0 82.5 46.0 90.7 91.4 127.0 – 30.2
3 ½” 90 228.5 184.2 22.2 8 34.9 101.6 133.4 49.3 85.7 49.3 103.4 104.1 140.0 – 31.7
4” 100 273.0 215.9 25.4 8 38.1 114.3 152.4 54.0 101.6 54.0 116.1 116.8 157.2 – 33.3
5” 125 330.2 266.7 28.6 8 44.4 141.2 188.9 60.3 114.3 60.3 143.8 144.5 185.7 – 36.5
6” 150 355.6 292.1 28.6 12 47.6 168.4 222.2 66.7 117.5 66.7 170.7 171.4 215.9 – 39.7
8” 200 419.1 349.2 31.7 12 55.6 219.2 273.0 76.2 133.3 76.2 221.5 222.2 269.9 – 44.4
10” 250 508.0 431.8 34.9 16 63.5 273.0 342.9 85.7 152.4 111.2 276.3 277.4 323.8 – 49.2
12” 300 558.8 488.9 34.9 20 66.7 323.8 400.0 92.1 155.6 117.3 327.1 328.2 381.0 – 55.6
14” 350 603.2 527.0 38.1 20 69.9 355.6 431.8 93.7 165.1 127.0 359.1 360.2 412.7 – 57.1
16” 400 685.8 603.2 41.3 20 76.2 406.4 495.3 106.4 177.8 139.7 410.5 411.2 469.9 – 63.5
18” 450 742.9 654.0 44.4 24 82.6 457.2 546.1 117.5 184.1 152.4 461.8 462.3 533.4 – 68.3
20” 500 812.8 723.9 44.4 24 88.9 508.0 609.6 127.0 190.5 165.1 513.1 514.3 584.2 – 73.0
24” 600 939.8 838.2 50.8 24 101.6 609.6 717.5 139.7 203.2 184.1 615.9 615.9 692.1 – 82.5

ANSI B 16.5 Class 1500 flange dimensions in MM

ANSI B 16.5 Class 1500 flange dimensions in mm
Nominal
Pipe Size		 Flange
Dia
‘O’		 Dia of
Bolt Circle
‘A’		 Dia of Bolt Holes
‘D’		 No. of
Holes		 Thickness of Flange
‘C’		 Diameter at Weld Bevel Dia of Hub
‘E’		 Length Through Hub Bore ‘B’ Dia of
R/F
R		 Depth of
Socket
F		 Length
of
Threading
S/O & S/W
Y		 W/N
Y		 L/J
Y		 S/O & S/W
B		 L/J
B
1/2” 15 120.6 82.5 22.2 4 22.2 21.3 38.1 31.7 60.3 31.7 22.3 22.9 34.9 9.5 22.2
3/4” 20 130.2 88.9 22.2 4 25.4 26.7 44.4 34.9 69.8 34.9 27.7 28.2 42.9 11.1 25.4
1” 25 149.2 101.6 25.4 4 28.6 33.5 52.4 41.3 73.0 41.3 34.5 35.0 50.8 12.7 28.6
1 ¼” 32 158.7 111.1 25.4 4 28.6 42.2 63.5 41.3 73.0 41.3 43.2 43.7 63.5 14.3 30.2
1 ½” 40 177.8 123.8 28.6 4 31.8 48.3 69.8 44.4 82.5 44.4 49.5 50.0 73.0 15.9 31.7
2” 50 215.9 165.1 25.4 8 38.1 60.4 104.8 57.1 101.6 57.1 62.0 62.5 92.1 17.5 38.1
2 ½” 65 244.5 190.5 28.6 8 41.3 73.1 123.8 63.5 123.8 63.5 74.7 75.4 104.8 19.0 47.6
3” 80 266.7 203.2 31.7 8 47.6 88.9 133.3 73.0 117.5 73.0 90.7 91.4 127.0 – 50.8
4” 100 311.1 241.3 34.9 8 54.0 114.3 161.9 90.5 123.0 90.5 116.1 116.8 157.2 – 57.1
5” 125 374.6 292.1 41.3 8 73.0 141.2 196.8 104.8 155.6 104.8 143.8 144.5 185.7 – 63.5
6” 150 393.7 317.5 38.1 12 82.6 168.4 228.6 119.1 171.4 119.1 170.7 171.4 215.9 – 69.8
8” 200 482.6 393.7 44.4 12 92.1 219.2 292.1 142.9 212.7 142.8 221.5 222.2 269.9 – 76.2
10” 250 584.2 482.6 50.8 12 107.9 273.0 368.3 158.7 254.0 177.8 276.3 277.4 323.8 – 84.1
12” 300 673.1 571.5 54.0 16 123.8 323.8 450.8 181.0 282.5 219.1 327.1 328.2 381.0 – 92.1
14” 350 749.5 635.0 60.5 16 133.4 355.6 495.3 – 298.5 241.3 359.1 360.2 412.7 – –
16” 400 825.5 704.9 66.5 16 146.1 406.4 552.5 – 311.2 260.4 410.5 411.2 469.9 – –
18” 450 914.5 774.7 73.5 16 162.0 457.2 596.9 – 327.0 276.2 461.8 462.3 533.4 – –
20” 500 984.0 831.9 79.5 16 177.8 508.0 641.4 – 355.6 292.1 513.1 514.3 584.2 – –
24” 600 1168.5 990.6 92.0 16 203.2 609.6 762.0 – 406.4 330.2 615.9 615.9 692.1 – –

ANSI B 16.5 Class 2500 flange dimensions in MM

ANSI B 16.5 Class 2500 flange dimensions in mm
Nominal
Pipe Size		 Flange
Dia
‘O’		 Dia of
Bolt Circle
‘A’		 Dia of Bolt Holes
‘D’		 No. of
Holes		 Thickness of Flange
‘C’		 Diameter at Weld Bevel Dia of Hub
‘E’		 Length Through Hub Bore ‘B’ Dia of
R/F
R		 Depth of
Socket
F		 Length
of
Threading
S/O & S/W
Y		 W/N
Y		 L/J
Y		 S/O & S/W
B		 L/J
B
1/2” 15 133.3 88.9 22.2 4 30.2 21.3 42.9 39.7 73.3 39.7 22.3 22.9 34.9 – 28.6
3/4” 20 139.7 95.2 22.2 4 31.7 26.7 50.8 42.9 79.4 42.9 27.7 28.2 42.9 – 31.7
1” 25 158.7 107.9 25.4 4 34.9 33.5 57.1 47.7 88.9 47.7 34.5 35.0 50.8 – 34.9
1 ¼” 32 184.1 130.2 28.6 4 38.1 42.2 73.0 52.4 95.2 52.4 43.2 43.7 63.5 – 38.1
1 ½” 40 203.2 146.0 31.7 4 44.4 48.3 79.4 60.3 111.1 60.3 49.5 50.0 73.0 – 44.4
2” 50 234.9 171.4 28.6 8 50.8 60.4 95.2 69.8 127.0 69.8 62.0 62.5 92.1 – 50.8
2 ½” 65 266.7 196.8 31.7 8 57.1 73.1 114.3 79.4 142.9 79.4 74.7 75.4 104.8 – 57.1
3” 80 304.8 228.6 34.9 8 66.7 88.9 133.3 92.1 168.3 92.1 90.7 91.4 127.0 – 63.5
4” 100 355.6 273.0 41.3 8 76.2 114.3 165.1 107.9 190.5 107.9 116.1 116.8 157.2 – 69.8
5” 125 419.1 323.8 47.6 8 92.1 141.2 203.2 130.0 128.6 130.0 143.8 144.5 185.7 – 76.2
6” 150 482.6 368.3 54.0 8 107.9 168.4 234.9 152.4 273.0 152.4 170.7 171.4 215.9 – 82.5
8” 200 552.4 438.1 54.0 12 127.0 219.2 304.8 177.8 317.5 177.8 221.5 222.2 269.9 – 95.2
10” 250 673.1 539.7 66.7 12 165.1 273.0 374.6 228.6 419.1 228.6 276.3 277.4 323.8 – 107.9
12” 300 762.0 619.1 73.0 12 184.1 323.8 441.3 254.0 463.5 254.0 327.1 328.2 381.0 – 120.6

Flange Standards

These Pipe Flange standards define dimensions, material requirements, pressure ratings, and manufacturing tolerances, ensuring interchangeability, safety, and reliability.

  1. ASME/ANSI Standards (American):
    • ASME B16.5 – Pipe Flanges and Flanged Fittings (NPS 1/2" to 24").
    • ASME B16.47 – Large Diameter Steel Flanges (Series A & B, NPS 26" to 60").
    • ASME B16.36 – Orifice Flanges.
    • ASME B16.48 – Line Blanks (Spectacle, Spade, and Spacer Flanges).
    • ANSI B16.1 – Cast Iron Flanges and Flanged Fittings.
    • ANSI B16.42 – Ductile Iron Pipe Flanges and Flanged Fittings.
  2. ISO Standards (International)
    • ISO 7005-1 – Steel Flanges for General Applications.
    • ISO 7005-2 – Cast Iron Flanges.
    • ISO 7005-3 – Copper Alloy Flanges.
  3. EN Standards (European)
    • EN 1092-1 – Steel Flanges.
    • EN 1092-2 – Cast Iron Flanges.
    • EN 1092-3 – Copper Alloy Flanges.
    • EN 1092-4 – Aluminium Alloy Flanges.
  4. DIN Standards (German)
    • DIN 2527 – Blind Flanges.
    • DIN 2576 – Slip-On Flanges (PN 10).
    • DIN 2633 – Weld Neck Flanges (PN 16).
    • DIN 2634 – Weld Neck Flanges (PN 25).
    • DIN 2635 – Weld Neck Flanges (PN 40).
  5. JIS Standards (Japanese)
    • JIS B2220 – Steel Pipe Flanges.
  6. GOST Standards (Russian)
    • GOST 12820 – Flat Flanges for Steel Pipe Joints.
    • GOST 12821 – Steel Welded Flanges for High-Pressure Applications.
    • GOST 33259 – Flange Connections for Industrial Equipment and Pipelines.
  7. BS Standards (British)
    • BS 4504 – Circular Flanges for Pipes, Valves, and Fittings.
    • BS 10 – Specification for Flanges and Bolting.
  8. API Standards (Oil & Gas)
    • API 6A – Wellhead and Christmas Tree Equipment Flanges.
    • API 605 – Large-Diameter Carbon Steel Flanges (merged into ASME B16.47 Series B).
  9. AWWA Standards (Waterworks)
    • AWWA C207 – Steel Ring Flanges for Waterworks Service.
  10. MSS Standards (Manufacturer's Standardization Society)
    • MSS SP-44 – Steel Pipe Flanges (merged into ASME B16.47 Series A).
    • MSS SP-51 – Flanges for Glass-Lined Equipment.
  11. Material-Specific Standards (ASTM)
    • ASTM A105 – Carbon Steel Forged Flanges.
    • ASTM A182 – Alloy and Stainless Steel Forged Flanges.
    • ASTM A350 – Carbon and Low-Alloy Steel Flanges for Low-Temperature Service.
    • ASTM A694 – High-Strength Carbon and Alloy Steel Flanges for High-Pressure Applications.
  12. Other Regional and Specialized Standards
    • KS B1511 – Korean Standard Flanges.
    • NF E29-206 – French Standard Flanges.
    • SANS 1123 – South African Standard for Steel Flanges.
Why Ample Alloys For Steel Flanges!

We are stands out as a trusted name in the manufacturing and supply of high-quality steel flanges. Choose Ample Alloys for unmatched quality, reliability, and service in steel flanges.

Extensive Product Range

Offering a comprehensive selection of flanges, including Weld Neck, Slip-On, Blind, Threaded, Socket Weld, and Lap Joint Flanges, crafted to meet international standards like ASME, ANSI, DIN, EN, and JIS.

Superior Quality

Committed to excellence, Ample Alloys ensures all products undergo rigorous quality checks to meet stringent industrial requirements for safety, durability, and precision.

Material Versatility

Specializing in carbon steel, stainless steel, and alloy steel flanges, suitable for diverse applications across oil & gas, petrochemical, power generation, and other sectors.

Customization Capabilities

Tailored solutions to match unique project specifications, including custom sizes, materials, and pressure ratings.

How are flanges connected?

Flanges are connected using bolts and gaskets to ensure a leak-proof seal between the flange faces.

What industries use industrial flanges?
  • Oil and Gas
  • Petrochemical and Chemical
  • Power Generation
  • Water Treatment
  • Marine and Shipbuilding
  • HVAC Systems
How to choose the right flange?
  • Pipe size and material
  • Pressure and temperature requirements
  • Flange type and connection style
  • Industry standards compliance

Available Types of Flanges

ASME/ANSI B16.5, B16.47 Slip on Flange

Slip on Flanges

ASME/ANSI B16.5, B16.47 Weld Neck Flanges / Long Weld Neck

Weld Neck Flanges / Long Weld Neck

ASME/ANSI B16.5, B16.47 Blind Flange

Blind Flanges

ASME/ANSI B16.5, B16.47 Socket Weld Flange

Socket Weld Flanges

ASME/ANSI B16.5, B16.47 Orifice Flange

Orifice Flanges

ASME/ANSI B16.5, B16.47 Ring Type Joint Flange

Ring Type Joint Flanges / RTJ Flange

ASME/ANSI B16.5, B16.47 Threaded Flange

Threaded Flanges

ASME/ANSI B16.5, B16.47 Lap Joint Flange

Lap Joint Flanges

ASME/ANSI B16.5, B16.47 Spectacle Blind Flanges / Paddle Blind / Ring Spacer

Spectacle Blind Flanges / Paddle Blind / Ring Spacer

ASME/ANSI B16.5, B16.47 Nipoflange

Nipoflange

ASME/ANSI B16.5, B16.47 Weldoflange

Weldoflange

ASME/ANSI B16.5, B16.47 Flangeolet

Flangeolet

ASME/ANSI B16.5, B16.47 Forged Flange

Forged Flange

ASME/ANSI B16.5, B16.47 Tongue and Groove Flange

Tongue and Groove Flanges

ASME/ANSI B16.5, B16.47 Male and Female Flange

Male and Female Flanges

ASME/ANSI B16.5, B16.47 Reducing Flange

Reducing Flanges

ASME/ANSI B16.5, B16.47 Square Flange

Square Flanges