Technolinks
Flanges
American Standerd

CLASS 150 FLANGES

DIMENSIONS OF CLASS 150 FLANGES (ANSI B 16.5) (in mm)
Nominal
Pipe Size		 Flange
Dia
'O'		 Dia of
Bolt Circle
'A'		 Dia of Bolt Holes
'D'		 No. of
Holes		 Thk 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

Note : Thickness 'C' is inclusive of Raised Face Thickness of 1.65 MM. For Class 150

A class 150 flange can be created from various materials like stainless steel, carbon steel, ductile iron, cast iron, etc and is resistant to abrasion & corrosion with high durability. Flanges such as American standard flanges, British standard flanges and German standard flanges created using above mentioned materials have separate pressure ratings.

The pressure rating of flanges depends on various factors which we will look at in the following section.

Flanges are able to resist different pressure values at different & varied temperatures. With increase in temperature pressure rating of a flange decreases. Let us take an example to illustrate what happens; Class 150 flanges rates to about 270 PSIG (in ambient conditions), at 400 F a PSIG of 180, at 600 F a PSIG of 150 & 75 PSIG at 800 F. So it all depends on the fluid’s operating temperature.

Different types of Class 150 Flanges:

  1. Welding neck flanges
  2. Slip on flanges
  3. Blind flanges
  4. Threaded flanges
  5. Lap joint flanges
  6. Socket weld flanges

 

CLASS 300 FLANGES

DIMENSIONS OF CLASS 300 FLANGES (ANSI B 16.5) (in mm)
Nominal
Pipe Size		 Flange
Dia
'O'		 Dia of
Bolt Circle
'A'		 Dia of Bolt Holes
'D'		 No. of
Holes		 Thk 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

Note : Thickness 'C' is inclusive of Raised Face Thickness of 1.65 MM. For Class 300

Different Types of ANSI B 16.5 Flanges -

  1. Welding Neck Flanges
  2. Slip on Flanges
  3. Blind Flanges
  4. Threaded Flanges
  5. Lap Joint Flanges
  6. Socket Weld Flanges

 

CLASS 600 FLANGES

DIMENSIONS OF CLASS 600 FLANGES (ANSI B 16.5) (in mm)
Nominal
Pipe Size		 Flange
Dia
'O'		 Dia of
Bolt Circle
'A'		 Dia of Bolt Holes
'D'		 No. of
Holes		 Thk 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

Note : Thickness 'C' is exclusive of Raised Face Thickness of 6.25 MM. For Class 600

 

CLASS 900 FLANGES

 

DIMENSIONS OF CLASS 900 FLANGES (ANSI B 16.5) (in mm)
Nominal
Pipe Size		 Flange
Dia
'O'		 Dia of
Bolt Circle
'A'		 Dia of Bolt Holes
'D'		 No. of
Holes		 Thk 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

Note : Thickness 'C' is exclusive of Raised Face Thickness of 6.25 MM. For Class 900

 

CLASS 1500 FLANGES

DIMENSIONS OF CLASS 1500 FLANGES (ANSI B 16.5) (in mm)
Nominal
Pipe Size		 Flange
Dia
'O'		 Dia of
Bolt Circle
'A'		 Dia of Bolt Holes
'D'		 No. of
Holes		 Thk 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 - -

Note : Thickness 'C' is exclusive of Raised Face Thickness of 6.25 MM. For Class 1500

 

CLASS 2500 FLANGES

DIMENSIONS OF CLASS 2500 FLANGES (ANSI B 16.5) (in mm)
Nominal
Pipe Size		 Flange
Dia
'O'		 Dia of
Bolt Circle
'A'		 Dia of Bolt Holes
'D'		 No. of
Holes		 Thk 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

Note : Thickness 'C' is exclusive of Raised Face Thickness of 6.25 MM. For Class 2500

 

Schedule Of Weldneck Flanges & Weights

WELDING NECK FLANGES BORES (in inchines)
Nom
Pipe
Size		 Outside
Diam		 Sched
10		 Sched
20		 Sched
30		 Std.
Wall		 Sched
40		 Sched
60		 Extra
Strong		 Sched
80		 Sched
100		 Sched
120		 Sched
140		 Sched
160		 Double
Extra
Strong
1/2'' 0.840 0.674 - - 0.622 0.622 - 0.546 0.546 - - - 0.464 0.252
3/4'' 1.050 0.884 - - 0.824 0.824 - 0.742 0.742 - - - 0.612 0.434
1'' 1.315 1.097 - - 1.049 1.049 - 0.957 0.957 - - - 0.815 0.599
1.1/4'' 1.660 1.442 - - 1.380 1.380 - 1.278 1.278 - - - 1.160 0.896
1.1/2'' 1.900 1.682 - - 1.610 1.610 - 1.500 1.500 - - - 1.338 1.100
2'' 2.375 2.157 - - 2.067 2.067 - 1.939 1.939 - - - 1.687 1.503
2.1/2'' 2.875 2.635 - - 2.469 2.469 - 2.323 2.323 - - - 2.125 1.771
3'' 3.500 3.260 - - 3.068 3.068 - 2.900 2.900 - - - 2.624 2.300
3-1/2'' 4.000 3.760 - - 3.548 3.548 - 3.364 3.364 - - - - 2.728
4'' 4.500 4.260 - - 4.026 4.026 - 3.826 3.826 - 3.624 - 3.438 3.152
5'' 5.563 5.295 - - 5.047 5.047 - 4.813 4.813 - 4.563 - 4.313 4.063
6'' 6.625 6.357 - - 6.065 6.065 - 5.761 5.761 - 5.501 - 5.187 4.897
8'' 8.625 8.329 8.125 8.071 7.981 7.981 7.813 7.625 7.625 7.437 7.187 7.001 6.813 6.875
10'' 10.750 10.420 10.250 10.136 10.020 10.020 9.750 9.750 9.562 9.312 9.062 8.750 8.500 8.750
12'' 12.750 10.420 10.250 12.090 12.000 11.938 11.626 11.750 11.374 11.062 10.750 10.500 10.126 10.750
14'' 14.000 13.500 13.376 13.250 13.250 13.124 12.812 13.000 12.500 12.124 11.814 11.500 11.188 -
16'' 16.000 15.500 15.376 15.250 15.250 15.000 14.688 15.000 14.312 13.938 13.564 13.124 12.812 -
18'' 18.000 17.500 17.376 17.124 17.250 16.876 16.500 17.000 16.124 15.688 15.250 14.876 14.438 -
20'' 20.000 19.500 19.250 19.000 19.250 18.812 18.376 19.000 17.938 17.438 17.000 16.500 16.062 -
24'' 24.000 23.500 23.250 22.876 23.250 22.624 22.062 23.000 21.562 20.938 20.376 19.876 19.312 -
30'' 30.000 29.376 29.000 28.750 29.250 - - 29.000 - - - - - -
36'' 36.000 35.376 35.000 34.750 35.250 34.500 - 35.000 - - - - - -
42'' 42.000 - - - 41.250 - - 41.000 - - - - - -

 

ANSI FLANGES WEIGHT (KGS)
Nom
Pipe
Size		 150# 300# 600# 900# 1500# 2500#
  WN S/O B/K WN S/O B/K WN S/O B/K WN S/O B/K WN S/O B/K WN S/O B/K
1/2'' 0.7 0.4 0.5 0.8 0.7 0.8 0.9 0.8 0.8 2.1 1.8 1.9 2.1 1.8 1.9 3.2 3 3
3/4'' 0.8 0.7 0.8 1.4 1.2 1.2 1.6 1.4 1.4 2.7 2.4 2.7 2.7 2.4 2.7 3.6 4 4.5
1'' 1.1 0.8 0.9 1.7 1.4 1.5 1.9 1.7 1.7 3.9 3.6 3.7 3.9 3.6 3.7 5.4 5 5
1.1/4'' 1.5 1.2 1.3 2.2 1.8 2 2.6 2.1 2.4 4.5 4.1 4.3 4.5 4.1 4.3 7.8 8 8
1.1/2'' 1.8 1.4 1.6 3.2 2.7 2.9 3.6 3.1 3.4 6.2 5.4 5.9 6.2 5.4 5.9 11.5 11 11
2'' 2.7 2.2 2.6 3.6 3.2 3.5 4.7 3.9 4.4 11.3 10.5 11.3 11.3 10.5 11.3 19 17 17
2.1/2'' 4.4 3.5 4.1 5.4 4.5 5.3 4.8 5.4 6.8 16.3 15.8 16 16.3 15.8 16 24 25 25
3'' 5.2 3.8 5.1 7.3 5.9 7.2 8.7 7.3 8.9 15 12.3 16.8 21 21.5 19.5 42.6 38 39
3-1/2'' 6.4 5 6.5 8.9 7.5 9.2 11.6 9 12.7 - - - - - - - - -
4'' 7.5 5.6 7.5 11.8 10 12.2 18.4 16.5 18.6 24 23.2 24.5 31.8 31 33 64 58 60
5'' 9.2 6.5 9.2 16 12.5 16 31 28.5 30.8 38.5 37.5 39.5 59 58.8 60 111 95 101
6'' 11.0 8.1 11.8 20.2 16.5 22 37 36.2 38 50 48.3 51.5 72 74 75 171 146 156
8'' 18.4 13 20.4 31.2 25.5 36 54.5 51.5 62.2 85 75 89 124 112 125 261 220 242
10'' 25.5 18.4 31 44.3 35 55 98.5 76.2 102 123 110 131 207 184 215 485 420 465
12'' 37 28.5 47 63.5 52 82.5 105 89.5 132 168 146 187 306 264 316 698 590 665
14'' 51 37.5 60 86 73 108 150 102 158 198 172 224 416 - - - - -
16'' 61.5 44.5 61 112 88 139 177 150 225 225 192 259 567 - - - - -
18'' 71.5 54 93 141 115 178 228 180 285 318 272 383 736 - - - - -
20'' 85 72 127 173 139 228 285 231 365 376 330 482 929 - - - - -
24'' 119 95 190 248 212 350 372 330 532 680 632 905 1504 - - - - -

Weldneck flanges

Weldneck flanges have drilled wall thickness which is of equally same dimension existing for matching pipe. Bore will be larger if the pipe is lighter and opposite will be true if pipe is heavier and the bore will be small.

Erosion as well as turbulence is significantly reduced in pipeline as bores of flange & pipe match. Due to these reasons weldneck flanges are chosen for critical applications where high pressure and hot-cold temperatures are prevalent. The different kinds of weldneck flanges available are:

  1. Weld neck flanges - raised face
  2. Weld neck flanges - flat face

Tolerance of Flanges

DIMENSIONS TOLERANCES OF FLANGES (in mm)
  Welding neck      
* outside diameter O.D. 600 if smaller  
+ 1.6
_
    O.D. over 600  
+ 3.1
_
         
         
    250 and smaller  
+ 0.7
_
  inside diameter 12 though 450  
+ 1.6
_
  (bore) 500 and larger
+ 3.1
- 1.6
         
         
    1.6 raised face
+ 0.4
_
  
  diameter of 6.3 raised face tounge &    
  contact face groove male and female
+ 0.4
_
  
         
         
* diameter of hub 125 and smaller
+ 2.2
- 0.7
  at point of weding 150 and larger
+ 4.0
- 0.7
         
         
  Thickness 450 and smaller
+ 3.1
- 0.0
    500 and larger
+ 4.7
- 0.0
         
  length through 250 and smaller
+ 1.6
_
  hub 300 and larger
+ 3.1
_
       
       
  bolt circle 600 and smaller
+ 0.7
_
    600 and larger
+ 1.6
_
       
  drilling bolt hole spacing
+ 0.7
_
     
     
  eccenticity with respect  
  to bore   0.70 max
     
  Threaded, Slip on lap joint,
Socket welding and blind		    
         
* outside diameter O.D. 600 or smaller  
+ 1.6
_
    O.D. over 600  
+ 3.1
_
       
  inside diameter threaded : to stand gauge limit
  (bore) slop on .lap joint : socket-welding
    250 and smaller
+ 0.7
- 0.0
    300 and larger
+ 1.6
- 0.0
         
    threaded  
  diameter of 250 and smaller
+ 0.7
- 0.0
  counter bore 300 and larger
+ 1.6
- 0.0
         
* outside diameter 300 and smaller
+ 2.3
- 1.6
  of hub 350 and larger
+ 3.1
_
         
  diameter of 1.6 raised face
+ 0.7
_
  contact face 6.3 raised fact tongue & grooved
    male & female  
+ 0.4
_
         
  Thickness 450 and smaller
+ 3.1
- 0.0
  hub 500 and larger
+ 4.7
- 0.0
       
* length through 450 and smaller
+ 3.0
- 1.6
  hub 500 and larger
+ 4.8
- 1.6
       
    bolt circle
+ 1.6
_
       
       
  drilling bolt hole spacing
+ 0.7
_
       
  eccenticity with respect    
  to bore   0.70 max
     
H Not covered by ANSI - B 16.5

 

 

British Standerd

BS 10 Table D & Table E

Table D for W. Steam Pressure upto 50 lbs per Sq. Inch
(in inchines)		   Table E for W. Steam Pressure 50 lbs and upto 100 lbs per Sq. Inch (in inchines)
Nominal
 Dia.
of
Flange		 I.D. of Flange Dia.
of
Bolt Circle		 No.
of
 Dia.
of
Bolt		 Thickness Nominal
 Dia.
of
Flange		 I.D. of Flange Dia.
of
Bolt Circle		 No.
of
 Dia.
of
Bolt		 Thickness
Pipe Size D d5 k Holes d2 b Pipe Size D d5 k Holes d2 b
1/2" 3.3/4" 7/8" 2.5/8" 4 1/2" 3/16" 1/2" 3.3/4" 7/8" 2.5/8" 4 1/2" 1/4"
3/4" 4" 1.3/32" 2.7/8" 4 1/2" 3/16" 3/4" 4" 1.3/32" 2.7/8" 4 1/2" 1/4"
1" 4.1/2" 1.23/64" 3.1/4" 4 1/2" 3/16" 1" 4.1/2" 1.23/64" 3.1/4" 4 1/2" 9/32"
1.1/4" 4.3/4" 1.45/64" 3.7/16" 4 1/2" 1/4" 1.1/4" 4.3/4" 1.45/64" 3.7/16" 4 1/2" 5/16"
1.1/2" 5.1/4" 1.15/16" 3.7/8" 4 1/2" 1/4" 1.1/2" 5.1/4" 1.15/16" 3.7/8" 4 1/2" 11/32"
2" 6" 2.7/16" 4.1/2" 4 5/8" 5/16" 2" 6" 2.7/16" 4.1/2" 4 5/8" 3/8"
2.1/2 6.1/2" 2.15/16" 5" 4 5/8" 5/16" 2.1/2" 6.1/2" 2.15/16" 5" 4 5/8" 13/32"
3" 7.1/4" 3.37/64" 5.3/4" 4 5/8" 3/8" 3" 7.1/4" 3.37/64" 5.3/4" 4 5/8" 7/16"
3.1/2" 8" 4.5/64" 6.1/2" 4 5/8" 3/8" 3.1/2" 8" 4.5/64" 6.1/2" 8 5/8" 15/32"
4" 8.1/2" 4.37/64" 7" 4 5/8" 3/8" 4" 8.1/2" 4.37/64" 7" 8 5/8" 1/2"
5" 10" 5.43/64" 8.1/4" 8 5/8" 1/2" 5" 10" 5.43/64" 8.1/4" 8 5/8" 9/16"
6" 11" 6.23/32" 9.1/4" 8 5/8" 1/2" 6" 11" 6.23/32" 9.1/4" 8 3/4" 11/16"
7" 12" 7.5/8" 10.1/4" 8 5/8" 1/2" 7" 12" 7.5/8" 10.1/4" 8 3/4" 3/4"
8' 13.1/4" 8.23/32" 11.1/2" 8 5/8" 1/2" 8" 12.1/4" 8.23/32" 11.1/2" 8 3/4" 3/4"
9" 14.1/2" 9.23/32" 12.3/4" 8 5/8" /8" 9" 14.1/2" 9.23/32" 12.3/4" 12 3/4" 13/16"
10" 16" 10.7/8" 14" 8 3/4" 5/8"> 10" 16" 10.7/8" 14" 12 3/4" 7/8"
12" 18" 12.7/8" 16" 12 3/4" 5/8" 12" 18" 12.7/8" 16" 12 7/8" 1"
14" 20.3/4" 14.9/64" 18.1/2" 12 7/8" 3/4" 4" 20.3/4" 14.9/64" 18.1/2" 12 7/8" 1"
16" 22.3/4" 16.5/32" 20.1/2" 12 7/8" 3/4" 6" 22.3/4" 16.5/32" 20.1/2" 12 7/8" 1"
18" 25.1/4" 18.3/16" 23" 12 7/8" 7/8" 18" 25.1/4" 18.3/16" 23" 16 7/8" 1.1/8"
20" 27.3/4" 20.13/16" 25.1/4" 16 7/8" 1" 20" 27.3/4" 20.13/16" 25.1/4" 16 7/8" 1.1/4"
24" 32.1/2" 24.1/4" 29.3/4" 16 1" 1.1/8" 24" 32.1/2" 24.1/4" 29.3/4" 16 1" 1.1/2"

 

 

BS 10 Table F & Table H

Table F for W. Steam Pressure 100 lbs per Sq. Inch
(in inchines)		   Table H for W. Steam Pressure 150 lbs and
upto 250 lbs per Sq. Inch (in inchines)
Nominal
 Dia.
of
Flange		 I.D. of Flange Dia.
of
Bolt Circle		 No.
of
 Dia.
of
Bolt		 Thickness Nominal
 Dia.
of
Flange		 I.D. of Flange Dia.
of
Bolt Circle		 No.
of
 Dia.
of
Bolt		 Thickness
Pipe Size D d5 k Holes d2 b Pipe Size D d5 k Holes d2 b
1/2" 3.3/4" 7/8" 2.5/8" 4 1/2" 3/8" 1/2" 4.1/2" 7/8" 3.1/4" 4 5/8" 1/2"
3/4" 4" 1.3/32" 2.7/8" 4 1/2" 3/8" 3/4" 4.1/2" 1.3/32" 3.1/4" 4 5/8" 1/2"
1" 4.3/4" 1.23/64" 3.7/16" 4 5/8" 3/8" 1" 4.3/4" 1.23/64" 33.7/16" 4 5/8" 9/16"
1.1/4" 5.1/4" 1.45/64" 3.7/8" 4 5/8" 1/2" 1.1/4" 5.1/4" 1.45/64" 3.7/8" 4 5/8" 11/16"
1.1/2" 5.1/2" 1.15/16" 4.1/8" 4 5/8" 1/2" 1.1/2" 5.1/2" 1.15/16" 4.1/8" 4 5/8" 11/16"
2" 6.1/2" 2.7/16" 5" 4 5/8" 5/8" 2" 6.1/2" 2.7/16" 5" 4 5/8" 3/4"
2.1/2 7.1/4" 2.15/16" 5.3/4" 8 5/8" 5/8" 2.1/2" 7.1/4" 2.15/16" 5.3/4" 8 5/8" 3/4"
3" 8" 3.37/64" 6.1/2" 8 5/8" 5/8" 3" 8" 3.37/64" 6.1/2" 8 5/8" 7/8"
3.1/2" 8.1/2" 4.5/64" 7" 8 5/8" 3/4" 3.1/2" 8.1/2" 4.5/64" 7" 8 5/8" 7/8"
4" 9" 4.37/64" 7.1/2" 8 5/8" 3/4" 4" 9" 4.37/64" 7.1/2" 8 5/8" 1"
5" 11" 5.43/64" 9.1/4" 8 3/4" 7/8" 5" 11" 5.43/64" 9.1/4" 8 3/4" 1.1/8"
6" 12" 6.23/32" 10.1/4" 12 3/4" 7/8" 6" 12" 6.23/32" 10.1/4" 12 3/4" 1.1/8"
7" 13.1/4" 7.5/8" 11.1/2" 12 3/4" 7/8" 7" 13.1/4" 7.5/8" 11.1/2" 12 3/4" 1.1/4"
8' 14.1/2" 8.23/32" 12.3/4" 12 3/4" 1" 8" 14.1/2" 8.23/32" 12.3/4" 12 3/4" 1.1/4"
9" 16" 9.23/32" 14" 12 7/8" 1" 9" 16" 9.23/32" 14" 12 7/8" 1.3/8"
10" 17" 10.7/8" 15" 12 7/8" 1" 10" 17" 10.7/8" 15" 12 7/8" 1.3/8"
12" 19.1/4" 12.7/8" 17.1/4" 16 7/8" 1/1/8" 12" 19.1/4" 12.7/8" 17.1/4" 16 7/8" 1.1/2"
14" 21.3/4" 14.9/64" 19.1/2" 16 1" 1.1/4" 4" 21.3/4" 14.9/64" 19.1/2" 16 1" 1.5/8"
16" 24" 16.5/32" 21.3/4" 20 1" 1.1/4" 6" 24" 16.5/32" 21.3/4" 20 1" 1.3/4"
18" 26.1/2" 18.3/16" 24" 20 1.1/8" 1.3/8" 18" 26.1/2" 18.3/16" 24" 20 1.1/8" 1.7/8"
20" 29" 20.13/16" 26.1/2" 24 1.1/8" 1.1/2" 20" 29" 20.13/16" 26.1/2" 24 1.1/8" 2"
24" 33.1/2" 24.1/4" 30.3/4" 24 1.1/4" 1.5/8" 24" 33.1/2" 24.1/4" 30.3/4" 24 1.1/4" 2.1/4"

 

Germen Standerd

DIN 2502 / 2503

DIN 2502 PN 16 (in mm)
Nominal Pipe Size Diameter of Flange Dia Flange I.D Thk of Flanges Dia of Bolt Cirlce No. of Dia of Bolt Holes  
DN Pipe D D5 B K holes D2 KG
10 17.20 90 17.70 14 60 4 14 0.60
15 21.30 95 22.00 14 65 4 14 0.67
20 26.90 105 27.60 16 75 4 14 0.94
25 33.70 115 34.40 16 85 4 14 1.11
32 42.40 140 43.10 16 100 4 18 1.62
40 48.30 150 49.00 16 110 4 18 1.85
50 60.30 165 61.10 18 125 4 18 2.46
65 76.10 185 77.10 18 145 4 18 2.99
80 88.90 200 90.30 20 160 8 18 3.61
100 114.30 220 115.90 20 180 8 18 3.99
125 139.70 250 141.60 22 210 8 18 5.41
150 168.30 285 170.50 22 240 8 22 6.55
175 193.70 315 196.10 24 270 8 22 8.42
200 219.10 340 221.80 24 295 12 22 8.97
250 273.00 405 276.20 26 355 12 26 12.76
300 323.90 460 327.60 28 410 12 26 16.60
350 355.60 520 359.70 30 470 16 26 24.08
400 406.40 580 411.00 32 525 16 30 30.20
450 457.00 640 462.30 38 585 20 30 41.67
500 508.00 715 513.60 38 650 20 33 52.87
600 610.00 840 616.50 42 770 20 36 77.58
700 711.00 910 716.00 44 840 24 36 77.13
800 813.00 1025 818.00 50 950 24 39 106.35
900 914.00 1125 920.00 54 1050 28 39 125.39
1000 1016.00 1255 1022.00 60 1170 28 42 177.99

 

DIN means Deutsches Institut für Normung, which in English means - German Institute for Standardization.

Various DIN standards such as DIN 2502 / DIN 2503, DIN 2527 and many others are published as a result of the work done by the institute. DIN is now the technical     standardization’s symbol in Germany.

DIN 2527

DIN 2527 PN6 (in mm)   DIN 2527 PN10 (in mm)
Nominal Pipe Size Flange Dia Thk of Flange Dia of Bolt Circle No. of Dia of Bolt Holes   Nominal Pipe Size Flange Dia Thk of Flange Dia of Bolt Circle No. of Dia of Bolt Holes  
DIN D B K holes D2 KG DIN D B K holes D2 KG
10 75 12 50 4 11 0.38 10 90 14 60 4 14 0.63
15 80 12 55 4 11 0.44 15 95 14 65 4 14 0.71
20 90 14 65 4 11 0.66 20 105 16 75 4 14 1.01
25 100 14 75 4 11 0.82 25 115 16 85 4 14 1.23
32 120 14 90 4 14 1.18 32 140 16 100 4 18 1.81
40 130 14 100 4 14 1.39 40 150 16 110 4 18 2.09
50 140 14 110 4 14 1.62 50 165 18 125 4 18 2.88
65 160 14 130 4 14 2.14 65 185 18 145 4 18 3.65
80 190 16 150 4 48 3.43 80 200 20 160 4 18 4.61
100 210 16 170 4 18 4.22 100 220 20 180 4 18 5.65
125 240 18 200 8 18 6.10 125 250 22 210 8 18 8.13
150 265 18 225 8 18 7.51 150 285 22 240 8 22 10.49
175 295 20 255 8 18 10.41 175 315 24 270 8 22 14.11
200 320 20 280 8 18 12.31 200 340 24 295 8 22 16.53
250 375 22 335 12 18 18.55 250 395 26 350 12 22 24.08
300 440 22 395 12 22 25.47 300 445 26 400 12 22 30.81
350 490 22 445 12 22 31.78 350 505 26 460 12 22 39.64
400 540 22 495 16 22 38.50 400 565 26 515 16 26 49.44
500 645 24 600 20 22 60.13 500 670 28 620 20 26 75.16
600 755 28 705 20 26 96.07 600 780 30 725 20 30 109.20
700 860 30 810 24 26 133.80 700 895 32 840 24 30 153.77
800 975 32 920 24 30 183.29 800 1015 36 950 24 33 222.86
900 1075 36 1020 24 30 251.70 900 1115 40 1050 24 33 299.08
1000 1175 42 1120 28 30 350.98 1000 1230 46 1160 28 36 418.78

 

DIN 2527 PN16 (in mm)   DIN 2527 PN25 (in mm)
Nominal Pipe Size Flange Dia Thk of Flange Dia of Bolt Circle No. of Dia of Bolt Holes     Nominal Pipe Size Flange Dia Thk of Flange Dia of Bolt Circle No. of Dia of Bolt Holes  
DIN D B K holes D2 KG   DIN D B K holes D2 KG
10 90 14 60 4 14 0.63   90 90 16 60 4 14 0.72
15 95 14 65 4 14 0.71   95 95 16 65 4 14 0.81
20 105 16 75 4 14 1.01   105 105 18 75 4 14 1.14
25 115 16 85 4 14 1.23   115 115 18 85 4 14 1.38
32 140 16 100 4 18 1.81   140 140 18 100 4 18 2.03
40 150 16 110 4 18 2.09   150 150 18 110 4 18 2.35
50 165 18 125 4 18 2.88   165 165 20 125 4 18 3.20
65 185 18 145 4 18 3.65   185 185 22 145 4 18 4.29
80 200 20 160 8 18 4.61   200 200 24 160 8 18 5.54
100 220 20 180 8 18 5.65   235 220 24 190 8 22 7.60
125 250 22 210 8 18 8.13   270 250 26 220 8 26 10.82
150 285 22 240 8 22 10.49   300 285 28 250 8 26 14.60
175 315 24 270 8 22 14.11   330 315 28 280 8 26 17.40
200 340 24 295 12 22 16.26   360 340 30 310 12 26 22.47
250 405 26 355 12 26 24.99   425 405 32 370 12 30 33.51
300 460 28 410 12 26 35.13   485 460 34 430 12 30 46.29
350 520 30 470 16 26 48.01   555 520 38 490 16 33 68.08
400 580 32 525 16 30 83.53   620 580 40 550 16 36 89.59
500 715 36 650 20 33 108.63   730 715 45 660 20 36 140.66
600 780 38 770 20 36 136.47   845 780 48 770 20 39 202.30
700 895 40 840 24 36 189.87   960 895 50 875 24 42 271.05
800 1015 44 950 24 39 269.57   1085 1015 54 990 24 48 373.52
900 1115 48 1050 28 39 355.31   1185 1115 58 1090 28 48 479.07
1000 1230 52 1170 28 42 469.20   1320 1230 62 1210 28 56 632.47

 

DIN 2527 PN40 (in mm)   DIN 2527 PN64 (in mm)
Nominal Pipe Size Flanges Dia Thk of Flange Dia of Bolt Circle No. of Dia of Bolt Holes     Nominal Pipe Size Flanges Dia Thk of Flange Dia of Bolt Circle No. of Dia of Bolt Holes  
DIN D B K holes D2 KG   DIN D B K holes D2 KG
10 90 16 60 4 14 0.72   10 90 20 70 4 14 1.04
15 95 16 65 4 14 0.81   15 95 20 75 4 14 1.16
20 105 18 75 4 14 1.14   20 105 24 100 4 18 2.54
25 115 18 85 4 14 1.38   25 115 24 110 4 22 3.07
32 140 18 100 4 18 2.03   32 140 26 125 4 22 3.97
40 150 18 110 4 18 2.35   40 150 26 135 4 22 4.51
50 165 20 125 4 18 3.20   50 165 26 160 4 22 5.69
65 185 22 145 8 18 4.29   65 185 28 170 8 22 6.88
80 200 24 160 8 18 5.54   80 200 30 200 8 26 9.99
100 235 24 190 8 22 7.60   100 235 34 240 8 30 15.91
125 270 26 220 8 26 10.82   125 270 36 280 8 33 23.32
150 300 28 250 8 26 14.60   150 300 40 310 8 33 30.35
175 350 32 295 12 30 22.04   175 350 42 345 12 36 39.17
200 375 34 320 12 30 27.21   200 375 46 400 12 38 56.64
250 450 38 385 12 33 44.38   250 450 52 460 12 36 81.14
300 515 42 450 16 33 64.17   300 515 56 525 16 39 112.95
350 580 46 510 16 36 89.52   350 580 60 585 16 42 152.30
400 660 50 585 16 39 126.76   400 660 - - 16 - -
500 755 56 670 20 42 184.63   500 755 - - 20 - -
600 890 62 795 20 48 285.17   600 890 - - 20 - -
700 995 64 900 24 48 368.83   700 995 - - 24 - -
800 1140 70 1030 24 56 528.39   800 1140 - - 24 - -
900 1250 76 1140 28 56 690.99   900 1250 - - 28 - -
1000 1360 84 1250 28 56 912.42   1000 1360 - - 28 - -

 

DIN 2527 PN100 (in mm)
Nominal Pipe Size Flange Dia Thk of Flange Dia of Bolt Circle Dia of R/F Thk of R/F No. of Dia of Bolt Holes  
DN D B K D4 F Holes D2 KG
10 100 20 70 40 2 4 14 1.04
15 105 20 75 45 2 4 14 1.16
25 140 24 100 68 2 4 18 2.54
32 155 24 110 78 2 4 22 3.07
40 170 26 125 88 3 4 22 3.97
50 195 28 145 102 3 4 26 5.64
65 220 30 170 122 3 8 26 7.43
80 230 32 180 138 3 8 26 8.84
100 265 36 210 162 3 8 30 13.31
125 315 40 250 188 3 8 33 21.30
150 355 44 290 218 3 12 33 29.43
175 385 48 320 260 3 12 33 38.75
200 430 52 360 285 3 12 36 52.66
250 505 60 430 345 3 12 39 85.41
300