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  
18"    450mm ASME B16.5 150 25 635 22 3/4 578 1 1/4 32 1  9/16 40 21 533   1/16 1.6 16
300 28 711 24 3/4 629 1 3/8 35 2 3/8 60 24
600 29 1/4 743 25 3/4 654 1 3/4 45 3 1/4 83  1/4 6.4 20
900 31 787 27 686 2 51 4 102
BS EN 1092/1 (PN) 16 25  1/16 640 23  1/32 585 1  3/16 30 1  9/16 40 21 5/8 550   5/32 4 20
25 26 3/8 670 23 5/8 600 1  7/16 36 1  5/32 46 21 7/8 555
40 26 15/16 685 25  1/16 610 1  9/16 39 2 57 22  1/16 560
BS 10 E 25 1/4 641 23 584 1 25 1 1/8 29   16
F 26 1/2 673 24 610 1 1/4 32 1 3/8 35 20
H 1 7/8 48 21 533   1/16 1.6
J 1 3/8 35 2 3/8 60
R 29 737 26 1/2 673 1 1/2 38 3 1/4 83 22 1/2 571
 
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