All dimensions are in "mm" unless noted otherwise.

Dimensions of Class 150 RF Weld Neck Flanges Series B as per ASME B16.47.

Weld Neck Flange

Nominal
Pipe Size
OD of
Flange
(O)
Thickness
of Flange
(C)
Length
thru Hub
(V)
Dia of
Hub at base
(X)
Dia of
Hub at end
(A)
Dia of
Raised Face
(R)
Dia of
Bolt Circle
No of
Bolt
Holes
Dia of
Bolt
Holes
Dia of
Bolt
Fillet
Radius
(r1)
Approx
Weight
(kg)
26 785.9 41.1 88.9 684.3 661.9 771.2 744.5 36 22.4 19.1 9.7 63
28 836.7 44.5 95.3 735.1 712.7 762 795.3 40 22.4 19.1 9.7 72
30 887.5 44.5 100.1 787.4 763.5 812.8 846.1 44 22.4 19.1 9.7 79
32 941.3 46 108 839.7 814.3 863.6 900.2 48 22.4 19.1 9.7 91
34 1004.8 49.3 110.2 892 865.1 920.8 957.3 40 25.4 22.2 9.7 109
36 1057.1 52.3 117.3 944.6 915.9 971.6 1009.7 44 25.4 22.2 9.7 124
38 1124 53.8 124 996.95 968.2 1022.4 1069.8 40 28.4 25.7 9.7 146
40 1174.8 55.6 128.5 1049.3 1019 1079.5 1120.6 44 28.4 25.4 9.7 159
42 1225.6 58.7 133.4 1101.9 1069.8 1130.3 1171.4 48 28.4 25.4 11.2 175
44 1276.4 60.5 136.7 1152.7 1120.6 1181.1 1222.2 52 28.4 25.4 11.2 187
46 1341.4 62 144.5 1205 1171.4 1234.9 1284.2 40 31.8 28.6 11.2 220
48 1392.2 65 149.4 1257.3 1222.2 1289.1 1335 44 31.8 28.6 11.2 239
50 1443 68.3 153.9 1308.1 1273 1339.9 1385.8 48 31.8 28.6 11.2 258
52 1493.8 69.9 157.2 1360.4 1323.8 1390.7 1436.6 52 31.8 28.6 11.2 274
54 1549.4 71.4 162.1 1412.7 1374.6 1441.5 1492.3 56 31.8 28.6 11.2 299
56 1600.2 73.2 166.6 1465.3 1425.4 1492.3 1543.1 60 31.8 28.6 14.2 318
58 1674.9 74.7 174.8 1516.1 1476.2 1543.1 1611.4 48 35.1 31.8 14.2 377
60 1725.7 76.2 179.3 1570 1527 1600.2 1662.2 52 35.1 31.8 14.2 401