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Flange Guide

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

Weld Neck flange

Other Pressure Classes

300
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 970 77.8
79.4
82.6
84.2
183
184.6
721
28 711.2 1035 84.2
85.8
88.9
90.5
195
196.6
775
30 762 1090 90.5
92.1
93.7
95.3
208
209.6
827
32 812.8 1150 96.9
98.5
98.5
100.1
221
222.6
881
34 863.6 1205 100.1
101.7
103.2
104.8
230
231.6
937
36 914.4 1270 103.2
104.8
109.6
111.2
240
241.6
991
38 965.2 1170 106.4
108
106.4
108
179
180.6
994
40 1016 1240 112.8
114.4
112.8
114.4
192
193.6
1048
42 1066.8 1290 117.5
119.1
117.5
119.1
198
199.6
1099
44 1117.6 1355 122.3
123.9
122.3
123.9
205
206.6
1149
46 1168.4 1415 127
128.6
127
128.6
214
215.6
1203
48 1219.2 1465 131.8
133.4
131.8
133.4
222
223.6
1254
50 1270.2 1530 138.2
139.8
138.2
139.8
230
231.6
1305
52 1320.8 1580 142.9
144.5
142.9
144.5
237
238.6
1356
54 1371.6 1660 150.9
152.5
150.9
152.5
251
252.6
1410
56 1422.4 1710 152.4
154
152.4
154
259
260.6
1464
58 1473.2 1760 157.2
158.8
157.2
158.8
265
266.6
1514
60 1524 1810 162
163.6
162
163.6
271
272.6
1564
Blind flange
NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 876.3 44.5 28 1.5/8 273
28 800 939.8 44.5 28 1.5/8 285
30 857 997 47.6 28 1.3/4 304
32 914 1054.1 50.8 28 1.7/8 317
34 965 1104.9 50.8 28 1.7/8 330
36 1022 1168.4 54 32 2 342
38 1029 1092.2 41.3 32 1.1/2 317
40 1086 1155.7 44.5 32 1.5/8 336
42 1137 1206.5 44.5 32 1.5/8 349
44 1194 1263.6 47.6 32 1.3/4 361
46 1245 1320.8 50.8 28 1.7/8 381
48 1302 1371.6 50.8 32 1.7/8 387
50 1359 1428.8 54 32 2 406
52 1410 1479.6 54 32 2 419
54 1467 1549.4 60.3 28 2.1/4 444
56 1518 1600.2 60.3 28 2.1/4 450
58 1575 1651 60.3 32 2.1/4 457
60 1626 1701.8 60.3 32 2.1/4 469

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.