Gasket Dimensions for Flat Ring and Full Face Applications

ASME B16.47 Series B Class 300 (Previously API 605)

Nominal Bore Gasket ID IBC Gasket OD Full Face Nominal Bore
Gasket OD Diameter of Bolt Holes Bolt P.C.D. Number of Bolt Holes
Inches mm Inches mm Inches mm Inches mm Inches mm
26 26 660.4 30 3/8 771.5 34 1/8 866.8 1 3/8 34.9 31 5/8 803.3 32 26
28 28 711.2 32 1/2 825.5 36 1/4 920.8 1 3/8 34.9 33 3/4 857.3 36 28
30 30 762.0 34 7/8 885.8 39 990.6 1 1/2 38.1 36 1/4 920.8 36 30
32 32 812.8 37 939.8 41 1/2 1054.1 1 5/8 41.3 38 1/2 977.9 32 32
34 34 863.6 39 1/8 993.8 43 5/8 1108.1 1 5/8 41.3 40 5/8 1031.9 36 34
36 36 914.4 41 1/4 1047.8 46 1/8 1171.6 1 3/4 44.5 42 7/8 1089.0 32 36
38 38 965.2 43 1/4 1098.6 48 1/8 1222.4 1 3/4 44.5 44 7/8 1139.8 36 38
40 40 1016.0 45 1/4 1149.4 50 1/8 1273.2 1 3/4 44.5 46 7/8 1190.6 40 40
42 42 1066.8 47 1/4 1200.2 52 1/2 1333.5 1 7/8 47.6 49 1244.6 36 42
44 44 1117.6 49 1/4 1251.0 54 1/2 1384.3 1 7/8 47.6 51 1295.4 40 44
46 46 1168.4 51 7/8 1317.6 57 1/2 1460.5 2 50.8 53 3/4 1365.3 36 46
48 48 1219.2 53 7/8 1368.4 59 1/2 1511.3 2 50.8 55 3/4 1416.1 40 48
50 50 1270.0 55 7/8 1419.2 61 1/2 1562.1 2 50.8 57 3/4 1466.9 44 50
52 52 1320.8 57 7/8 1470.0 63 1/2 1612.9 2 50.8 59 3/4 1517.7 48 52
54 54 1371.6 61 1/4 1555.8 65 7/8 1673.2 2 50.8 62 1/8 1578.0 48 54
56 56 1422.4 62  3/4 1593.9 69 1/2 1765.3 2 3/8 60.3 65 1651.0 36 56
58 58 1473.2 65 7/8 1673.2 71 15/16 1827.2 2 3/8 60.3 67 7/16 1712.9 40 58
60 60 1524.0 67 1/8 1705.0 73 15/16 1878.0 2 3/8 60.3 69 7/16 1763.7 40 60