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  
20"    500mm ASME B16.5 150 27 1/2 698 25 635 1 1/4 32 1 11/16 43 23 584   1/16 1.6 20
300 30 1/2 775 27 686 1 3/8 35 2 1/2 64 24
600 32 813 28 1/2 724 1 3/4 44 3 1/2 89  1/4 6.4
900 33 3/4 857 29 1/2 749 2 1/8 54 4 1/4 108 20
BS EN 1092/1 (PN) 16 28  3/16 715 25  9/16 650 1  5/16 33 1 3/8 44 24 610   5/32 4 20
25 28 3/4 730 26 660 1  7/16 36 1 3/4 48 24  3/16 615
40 29 3/4 755 26 3/8 670 1 11/16 42 2  1/16 57
BS 10 E 27 3/4 705 25 1/4 641 1 25 1 1/4 32   16
F 29 737 26 1/2 673 1 1/4 32 1 1/2 38 24
H 2 51 23 1/2 597   1/16 1.6
J 1 3/8 35 2 1/2 64
R 31 3/4 807 28 3/4 730 1 5/8 41 3 1/2 89 24 1/2 622 20
 
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