CLASS 300 FLANGES

American Standard

British Standard

German Standard

BS EN 1092-1:2002

Indian Standard

 
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		 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
 

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