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Flange Guide

Dimensions Weld Neck & Blind flanges ASME B16.47 Series A Class 600

Weld Neck flange

Other Pressure Classes

600
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 1015 108
114.35
125.5
131.85
222
228.35
748
28 711.2 1075 111.2
117.55
131.8
138.15
235
241.35
803
30 762 1130 114.3
120.65
139.7
146.05
248
254.35
862
32 812.8 1195 117.5
123.85
147.7
154.05
260
266.35
918
34 863.6 1245 120.7
127.05
154
160.35
270
276.35
973
36 914.4 1315 123.9
130.25
162
168.35
283
289.35
1032
38 965.2 1270 152.4
158.75
155
161.35
254
260.35
1022
40 1016 1320 158.8
165.15
162
168.35
264
270.35
1073
42 1066.8 1405 168.3
174.65
171.5
177.85
279
285.35
1127
44 1117.6 1455 173.1
179.45
177.8
184.15
289
295.35
1181
46 1168.4 1510 179.4
185.75
185.8
192.15
300
306.35
1235
48 1219.2 1595 189
195.35
195.3
201.65
316
322.35
1289
50 1270.2 1670 196.9
203.25
203.2
209.55
329
335.35
1343
52 1320.8 1720 203.2
209.55
209.6
215.95
337
343.35
1394
54 1371.6 1780 209.6
215.95
217.5
223.85
349
355.35
1448
56 1422.4 1855 217.4
223.75
225.5
231.85
362
368.35
1502
58 1473.2 1905 222.3
228.65
231.8
238.15
370
376.35
1553
60 1524 1995 233.4
239.75
242.9
249.25
389
395.35
1610
Blind flange
NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 914.4 50.8 28 1.7/8 368
28 800 965.2 54 28 2 381
30 857 1022.4 54 28 2 393
32 914 1079.5 60.3 28 2.1/4 419
34 965 1130.3 60.3 28 2.1/4 425
36 1022 1193.8 66.7 28 2.1/2 450
38 1054 1162 60.3 28 2.1/4 463
40 1111 1212.8 60.3 32 2.1/4 476
42 1168 1282.7 66.7 28 2.1/2 501
44 1226 1333.5 66.7 32 2.1/2 514
46 1276 1390.6 66.7 32 2.1/2 527
48 1334 1460.5 73 32 2.3/4 565
50 1384 1524 79.4 28 3 590
52 1435 1574.8 79.4 32 3 603
54 1492 1632 79.4 32 3 615
56 1543 1695.4 85.7 32 3.1/4 647
58 1600 1746.2 85.7 32 3.1/4 660
60 1657 1822.4 92.1 28 3.1/2 692

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.