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Flange Guide

Dimensions Weld Neck & Blind flanges ASME B16.47 Series B Class 900

Weld Neck flange

Other Pressure Classes

900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 1020 135
141.35
154
160.35
259
265.35
743
28 711.2 1105 147.7
154.05
166.7
173.05
276
282.35
797
30 762 1180 155.6
161.95
176.1
182.45
289
295.35
851
32 812.8 1240 160.4
166.75
186
192.35
303
309.35
908
34 863.6 1315 171.5
177.85
195
201.35
319
325.35
962
36 914.4 1345 173.1
179.45
201.7
208.05
325
331.35
1016
38 965.2 1460 190.5
196.85
215.9
222.25
352
358.35
1073
40 1016 1510 196.9
203.25
223.9
230.25
364
370.35
1127
42 1066.8 1560 206.4
212.75
231.8
238.15
371
377.35
1176
44 1117.6 1650 214.4
220.75
242.9
249.25
391
397.35
1235
46 1168.4 1735 225.6
231.95
255.6
261.95
411
417.35
1292
48 1219.2 1785 233.4
239.75
263.6
269.95
419
425.35
1343
Blind flange
NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 762 901.7 66.7 20 425
28 819 971.6 73 20 470
30 876 1035 79.4 20 3 495
32 927 1092.2 79.4 20 3 508
34 991 1155.7 85.7 20 540
36 1029 1200.2 79.4 24 3 533
38 1099 1289 92.1 20 591
40 1162 1339.8 92.1 24 603
42 1213 1390.6 92.1 24 622
44 1270 1463.7 98.4 24 654
46 1334 1536.7 104.8 24 4 686
48 1384 1587.5 104.8 24 4 705

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.