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Flange Guide

Dimensions Weld Neck & Blind flanges ASME B16.47 Series A Class 150

Weld Neck flange

Other Pressure Classes

150 -
300 -
400 -
600 -
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 870 66.7
68.3
66.7
68.3
119
120.6
676
28 711.2 925 69.9
71.5
69.9
71.5
124
125.6
727
30 762 985 73.1
74.7
73.1
74.7
135
136.6
781
32 812.8 1060 79.4
81
79.4
81
143
144.6
832
34 863.6 1110 81
82.6
81
82.6
148
149.6
883
36 914.4 1170 88.9
90.5
88.9
90.5
156
157.6
933
38 965.2 1240 85.8
87.4
85.8
87.4
156
157.6
991
40 1016 1290 88.9
90.5
88.9
90.5
162
163.6
1041
42 1066.8 1345 95.3
96.9
95.3
96.9
170
171.6
1092
44 1117.6 1405 100.1
101.7
100.1
101.7
176
177.6
1143
46 1168.4 1455 101.6
103.2
101.6
103.2
184
185.6
1197
48 1219.2 1510 106.4
108
106.4
108
191
192.6
1248
50 1270 1570 109.6
111.2
109.6
111.2
202
203.6
1302
52 1320.8 1625 114.3
115.9
114.3
115.9
208
209.6
1353
54 1371.6 1685 119.1
120.7
119.1
120.7
214
215.6
1403
56 1422.4 1745 122.3
123.9
122.3
123.9
227
228.6
1457
58 1473.2 1805 127
128.6
127
128.6
233
234.6
1508
60 1524 1855 130.2
131.8
130.2
131.8
238
239.6
1559
Blind flange
NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 806.4 34.9 24 1.1/4 222
28 800 863.6 34.9 28 1.1/4 228
30 857 914.4 34.9 28 1.1/4 234
32 914 977.9 41.3 28 1.1/2 266
34 965 1028.7 41.3 32 1.1/2 266
36 1022 1085.8 41.3 32 1.1/2 279
38 1073 1149.4 41.3 32 1.1/2 279
40 1124 1200.2 41.3 36 1.1/2 279
42 1194 1257.3 41.3 36 1.1/2 292
44 1245 1314.4 41.3 40 1.1/2 304
46 1295 1365.2 41.3 40 1.1/2 304
48 1359 1422.4 41.3 44 1.1/2 317
50 1410 1479.6 47.6 44 1.3/4 336
52 1461 1536.7 47.6 44 1.3/4 349
54 1511 1593.8 47.6 44 1.3/4 355
56 1575 1651 47.6 48 1.3/4 361
58 1626 1708.2 47.6 48 1.3/4 374
60 1676 1759 47.6 52 1.3/4 381

Important Information

Indications:


General notes:

Measuring lengths of Stud Bolts and Hex bolts
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Raised Face Height

For the height measures H and B of all described dimensions of flanges on this website, with exception of the Lap Joint Flange, it is important to understand and remember the following:

In Pressure Classes 150 and 300, the height of raised face is approximately 1.6 mm (1/16 inch).
In these two Pressure Classes, almost all suppliers of flanges, show in their catalog or brochure, the H and B dimensions including the raised face height. See figure 1 on the image below.

Raised face height

In Pressure Classes 400, 600, 900, 1500 and 2500, the height of raised face is approximately 6.4 mm (1/4 inch). In these Pressure Classes, most suppliers show the H and B dimensions excluding the raised face height. See figure 2 on the image above.

On this site you will find two dimensions. The top row dimensions are excluding the raised face height, and in the bottom row the dimensions are including the raised face height.