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Flange Guide

Dimensions Weld Neck & Blind flanges ASME B16.47 Series B Class 300

Weld Neck flange

Other Pressure Classes

300
NPS OD D B
(WNF)
B
(BLF)
H A
26 665.2 865 87.4
89
87.4
89
168
169.6
702
28 716 920 87.4
89
87.4
89
148
149.6
756
30 768.4 990 92.1
93.7
92.1
93.7
156
157.6
813
32 819.2 1055 101.6
103.2
101.6
103.2
167
168.6
864
34 870 1110 101.6
103.2
101.6
103.2
171
172.6
918
36 920.8 1170 101.6
103.2
101.6
103.2
179
180.6
965
38 971.6 1220 109.6
111.2
109.6
111.2
190
191.6
1016
40 1022.4 1275 114.3
115.9
114.3
115.9
197
198.6
1067
42 1074.7 1335 117.5
119.1
117.5
119.1
203
204.6
1118
44 1125.5 1385 125.5
127.1
125.5
127.1
213
214.6
1173
46 1176.3 1460 127
128.6
128.6
130.2
221
222.6
1229
48 1227.1 1510 127
128.6
133.4
135
222
223.6
1278
50 1277.9 1560 136.6
138.2
138.2
139.8
233
234.6
1330
52 1328.7 1615 141.3
142.9
142.6
144.2
241
242.6
1383
54 1379.5 1675 135
136.6
147.7
149.3
238
239.6
1435
56 1430.3 1765 152.4
154
155.4
157
267
268.6
1494
58 1481.1 1825 152.4
154
160.4
162
273
274.6
1548
60 1557.3 1880 149.3
150.9
165.1
166.7
270
271.6
1599
Blind flange
NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 737 803.3 34.9 32 260
28 787 857.2 34.9 36 260
30 845 920.8 38.1 36 1.3/8 273
32 902 977.9 41.3 32 298
34 953 1031.9 41.3 36 298
36 1010 1089 44.5 32 1.3/8 305
38 1060 1139.8 44.5 36 1.3/8 324
40 1114 1190.6 44.5 40 1.5/8 330
42 1168 1244.6 47.6 36 343
44 1219 1295.4 47.6 40 362
46 1270 1365.2 50.8 36 1.7/8 368
48 1327 1416 50.8 40 1.7/8 368
50 1378 1466.8 50.8 44 1.7/8 387
52 1429 1517.6 50.8 48 1.7/8 400
54 1480 1578 50.8 48 1.7/8 387
56 1537 1651 60.3 36 438
58 1594 1712.9 60.3 40 438
60 1651 1763.7 60.3 40 432

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.