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Flange Guide

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

Weld Neck flange

Other Pressure Classes

600
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 890 111.2
117.55
111.2
117.55
181
187.35
698
28 711.2 950 115.9
122.25
115.9
122.25
190
196.35
752
30 762 1020 125.5
131.85
127
133.35
205
211.35
806
32 812.8 1085 130.2
136.55
134.9
141.25
216
222.35
860
34 863.6 1160 141.3
147.65
144.2
150.55
233
239.35
914
36 914.4 1215 146.1
152.45
150.9
157.25
243
249.35
968
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
26 727 806.4 44.5 28 1.5/8 337
28 784 863.6 47.6 28 349
30 841 927.1 50.8 28 1.7/8 375
32 895 984.2 54 28 2 394
34 953 1054.1 60.3 24 425
36 1010 1104.9 60.3 28 438
38 1054 1162 60.3 28 451
40 1111 1212.8 60.3 32 464
42 1168 1282.7 66.7 28 495
44 1226 1333.5 66.7 32 508
46 1276 1390.6 66.7 32 521
48 1334 1460.5 73 32 552
50 1384 1524 79.4 28 3 578
52 1435 1574.8 79.4 32 3 591
54 1492 1632 79.4 32 3 603
56 1543 1695.4 85.7 32 635
58 1600 1746.2 85.7 32 641
60 1657 1822.4 92.1 28 679

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.