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Flange Guide

Dimensions Weld Neck & Blind flanges ASME B16.47 Series A Class 400

Weld Neck flange

Other Pressure Classes

400
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 970 88.9
95.25
98.5
104.85
194
200.35
727
28 711.2 1035 95.3
101.65
104.8
111.15
206
212.35
783
30 762 1090 101.6
107.95
111.2
117.55
219
225.35
837
32 812.8 1150 108
114.35
115.9
122.25
232
238.35
889
34 863.6 1205 111.2
117.55
122.3
128.65
241
247.35
945
36 914.4 1270 114.3
120.65
128.6
134.95
251
257.35
1000
38 965.2 1205 123.9
130.25
123.9
130.25
206
212.35
1003
40 1016 1270 130.2
136.55
130.2
136.55
216
222.35
1054
42 1066.8 1320 133.4
139.75
133.4
139.75
224
230.35
1108
44 1117.6 1385 139.7
146.05
139.7
146.05
233
239.35
1159
46 1168.4 1440 146.1
152.45
146.1
152.45
244
250.35
1213
48 1219.2 1510 152.4
158.75
152.4
158.75
257
263.35
1267
50 1270.2 1570 157.2
163.55
158.8
165.15
268
274.35
1321
52 1320.8 1620 162
168.35
163.6
169.95
276
282.35
1372
54 1371.6 1700 169.9
176.25
171.5
177.85
289
295.35
1426
56 1422.4 1755 174.7
181.05
176.3
182.65
298
304.35
1480
58 1473.2 1805 177.8
184.15
181
187.35
306
312.35
1530
60 1524 1885 185.8
192.15
189
195.35
319
325.35
1584
Blind flange
NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 876.3 47.6 28 317
28 800 939.8 50.8 28 1.7/8 336
30 857 997 54 28 2 355
32 914 1054.1 54 28 2 361
34 965 1104.9 54 28 2 374
36 1022 1168.4 54 32 2 381
38 1035 1117.6 47.6 32 374
40 1092 1174.8 50.8 32 1.7/8 393
42 1143 1225.6 50.8 32 1.7/8 400
44 1200 1282.7 54 32 2 419
46 1257 1339.8 54 36 2 431
48 1308 1403.4 60.3 28 457
50 1362 1460.5 60.3 32 469
52 1413 1511.3 60.3 32 476
54 1470 1581.2 66.7 28 508
56 1527 1632 66.7 32 514
58 1578 1682.8 66.7 32 520
60 1635 1752.6 73 32 552

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.