Home - www.wermac.orgsearch wermac.org
www.wermac.org
Flange Guide

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

Weld Neck flange

Other Pressure Classes

900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 1085 139.7
146.05
160.4
166.75
286
292.35
775
28 711.2 1170 142.9
149.25
171.5
177.85
298
304.35
832
30 762 1230 149.3
155.65
182.6
188.95
311
317.35
889
32 812.8 1315 158.8
165.15
193.7
200.05
330
336.35
946
34 863.6 1395 165.1
171.45
204.8
211.15
349
355.35
1006
36 914.4 1460 171.5
177.85
214.4
220.75
362
368.35
1064
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
26 749 952.5 73 20 2.3/4 476
28 800 1022.4 79.4 20 3 501
30 857 1085.8 79.4 20 3 520
32 914 1155.7 85.7 20 3.1/4 558
34 965 1225.6 92.1 20 3.1/2 584
36 1022 1289 92.1 20 3.1/2 603
38 1099 1289 92.1 20 3.1/2 622
40 1162 1339.8 92.1 24 3.1/2 635
42 1213 1390.6 92.1 24 3.1/2 654
44 1270 1463.7 98.4 24 3.3/4 685
46 1334 1536.7 104.8 24 4 723
48 1384 1587.5 104.8 24 4 736

Important Information

Indications:


General notes:

Measuring lengths of Stud Bolts and Hex bolts
PP
Close

^

Close

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.