ASME/ANSI B16.5 Class 600 BL

Manufacture of Pipe flanges, Spectacle Blind Flange, ASME/ANSI B16.5 Class 600 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 95 34.9 14.3 66.7 15.9 4 0.76
3/4 115 42.9 15.9 82.6 19.1 4 1.23
1 125 50.8 17.5 88.9 19.1 4 1.64
1 1/4 135 63.5 20.7 98.4 19.1 4 2.32
1 1/2 155 73.0 22.3 114.3 22.2 4 3.26
2 165 92.1 25.4 127.0 19.1 8 4.18
2 1/2 190 104.8 28.6 149.2 22.2 8 6.15
3 210 127.0 31.8 168.3 22.2 8 8.57
3 1/2 230 139.7 35.0 184.2 25.4 8 11.15
4 275 157.2 38.1 215.9 25.4 8 17.63
5 330 185.7 44.5 266.7 28.6 8 29.60
6 355 215.9 47.7 292.1 28.6 12 36.22
8 420 269.9 55.6 349.2 31.8 12 59.51
10 510 323.8 63.5 431.8 34.9 16 98.79
12 560 381.0 66.7 489.0 34.9 20 125.29
14 605 412.8 69.9 527.0 38.1 20 152.70
16 685 469.9 76.2 603.2 41.3 20 214.13
18 745 533.4 82.6 654.0 44.5 20 275.01
20 815 584.2 88.9 723.9 44.5 24 353.07
24 940 692.2 101.6 838.2 50.8 24 535.77


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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