Flange Comparison Table
 
SIZE STAND-ARD CLASS FLANGE DIAMETER BOLT HOLE P.C.D. BOLT HOLE DIAMETER FLANGE THICKNESS RAISED FACE DIAMETER RAISED FACE HEIGHT No. OF BOLTS
D P d t R f N
ins mm ins mm ins mm ins mm ins mm ins mm  
12"    300mm ASME B16.5 150 19 483 17 432 1 25 1 1/4 32 15 381   1/16 1.6 12
300 20 1/2 521 17 3/4 450 1 1/4 32 2    51 16
600 22 559 19 1/4 489 1 3/8 34 2 5/8 67  1/4 6.4 20
900 24 610 21 533 1 1/2 38 3 1/8 79
BS EN 1092/1 (PN) 16 18 1/8 460 16 1/8 410 1  1/16 27 1 1/8 28 14 7/8 378   5/32 4 12
25 19 1/8 485 16 15/16 430 1  3/16 30 1 3/8 34 15  9/16 395 16
40 20 1/4 515 17 3/4 450 1  5/16 33 1 11/16 42 16 1/8 410
BS 10 E 18 457 16 406 15/16 24 1 25   12
F 19 1/4 489 17 1/4 438 1 1/8 28 16
H 1 1/2 38 14 1/4 362   1/16 1.6
J 1  1/16 27 2 51
R 20 508 18 457 1  3/16 30 2 1/2 64
 
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