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Flange Guide

Dimensions Weld Neck & Blind flanges ASME B16.47 Series B Class 150

Weld Neck flange

Other Pressure Classes

150
NPS OD D B
(WNF)
B
(BLF)
H A
26 661.9 785 39.8
41.4
43
44.6
87
88.6
684
28 712.7 835 43
44.6
46.2
47.8
94
95.6
735
30 763.5 885 43
44.6
49.3
50.9
98
99.6
787
32 814.3 940 44.6
46.2
52.5
54.1
106
107.6
840
34 865.1 1005 47.7
49.3
55.7
57.3
109
110.6
892
36 915.9 1055 50.9
52.5
57.3
58.9
116
117.6
945
38 968.2 1125 52.5
54.1
62
63.6
122
123.6
997
40 1019 1175 54.1
55.7
65.2
66.8
127
128.6
1049
42 1069.8 1225 57.3
58.9
66.8
68.4
132
133.6
1102
44 1120.6 1275 58.9
60.5
70
71.6
135
136.6
1153
46 1171.4 1340 60.4
62
73.1
74.7
143
144.6
1205
48 1222.2 1390 63.6
65.2
76.3
77.9
148
149.6
1257
50 1273 1445 66.8
68.4
79.5
81.1
152
153.6
1308
52 1323.8 1495 68.4
70
82.7
84.3
156
157.6
1360
54 1374.6 1550 70
71.6
85.8
87.4
160
161.6
1413
56 1425.4 1600 71.6
73.2
89
90.6
165
166.6
1465
58 1476.2 1675 73.1
74.7
91.9
93.5
173
174.6
1516
60 1527 1725 74.7
76.3
95.4
97
178
179.6
1570
Blind flange
NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 711 744.5 22.2 36 3/4 140
28 762 795.3 22.2 40 3/4 146
30 813 846.1 22.2 44 3/4 146
32 864 900.1 22.2 48 3/4 146
34 921 957.3 25.4 40 7/8 159
36 972 1009.6 25.4 44 7/8 165
38 1022 1070 28.6 40 1 178
40 1080 1120.8 28.6 44 1 178
42 1130 1171.6 28.6 48 1 184
44 1181 1222.4 28.6 52 1 190
46 1235 1284.3 31.8 40 1.1/8 203
48 1289 1335.1 31.8 44 1.1/8 203
50 1340 1385.9 31.8 48 1.1/8 210
52 1391 1436.7 31.8 52 1.1/8 216
54 1441 1492.2 31.8 56 1.1/8 216
56 1492 1543 31.8 60 1.1/8 222
58 1543 1611.3 34.9 48 229
60 1600 1662.1 34.9 52 235

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.