ASME/ANSI B16.5 Class 900 BL

Nominal Pipe Size  Outside Diameter of Flange Diameter of Raised Face Thickness of Flanges Min. Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approximate Weight kgs
NPS O R tf W I n  
1/2 120 34.9 22.3 82.6 22.2 4 1.76
3/4 130 42.9 25.4 88.9 22.2 4 2.42
1 150 50.8 28.6 101.6 25.4 4 3.63
1 1/4 160 63.5 28.6 111.1 25.4 4 4.24
1 1/2 180 73.0 31.8 123.8 28.6 4 5.95
2 215 92.1 38.1 165.1 25.4 8 10.02
2 1/2 245 104.8 41.3 190.5 28.6 8 14.11
3 240 127.0 38.1 190.5 25.4 8 13.02
4 290 157.2 44.5 235.0 31.8 8 21.94
5 350 185.7 50.8 279.4 34.9 8 36.83
6 380 215.9 55.6 317.5 31.8 12 47.40
8 470 269.9 63.5 393.7 38.1 12 82.87
10 545 323.8 69.9 469.9 38.1 16 122.61
12 610 381.0 79.4 533.4 38.1 20 174.34
14 640 412.8 85.8 558.8 41.3 20 206.16
16 705 469.9 88.9 616.0 44.5 20 260.49
18 785 533.4 101.6 685.8 50.8 20 366.23
20 855 584.2 108.0 749.3 54.0 20 463.04
24 1040 692.2 139.7 901.7 66.7 20 876.34


Standards, Dimensions & Weight of Blind flanges

What is the use of a blind flange

Most common flange types

Regardless of custom sizing or specifications, the fundamental design of most flanges falls under six common styles created to close, connect, cover, or support pipes and pipe systems.



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