Dimensions Weld Neck & Blind flanges ASME B16.47 Series B Class 400



Weld Neck flange

OTHER PRESSURE CLASSES

150
400
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 850 88.9
95.25
98.5
104.85
149
155.35
698
28 711.2 915 95.3
101.65
104.8
111.15
159
165.35
740
30 762 970 101.6
107.95
111.2
117.55
170
176.35
794
32 812.8 1035 108
114.35
115.9
122.25
179
185.35
845
34 863.6 1085 111.2
117.55
122.3
128.65
187
193.35
899
36 914.4 1155 119.1
125.45
119.1
125.45
200
206.35
952
38 965.2 1205 123.9
130.25
123.9
130.25
206
212.35
1003
40 1016 1270 130.2
136.55
130.2
136.55
216
222.35
1054
42 1066.8 1320 133.4
139.75
133.4
139.75
224
230.35
1108
44 1117.6 1385 139.7
146.05
139.7
146.05
233
239.35
1159
46 1168.4 1440 146.1
152.45
146.1
152.45
244
250.35
1213
48 1219.2 1510 152.4
158.75
152.4
158.75
257
263.35
1267
50 1270.2 1570 157.2
163.55
158.8
165.15
268
274.35
1321
52 1320.8 1620 162
168.35
163.6
169.95
276
282.35
1372
54 1371.6 1700 169.9
176.25
171.5
177.85
289
295.35
1426
56 1422.4 1755 174.7
181.05
176.3
182.65
298
304.35
1480
58 1473.2 1805 177.8
184.15
181
187.35
306
312.35
1530
60 1524 1885 185.8
192.15
189
195.35
319
325.35
1584


Blind flange

NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 711 781 38.1 28 1.3/8 279
28 762 838.2 41.3 24 1.1/2 298
30 819 895.4 41.3 28 1.1/2 311
32 873 952.5 44.5 28 1.5/8 330
34 927 1003.3 44.5 32 1.5/8 337
36 981 1066.8 47.6 28 1.3/4 356
38 1035 1117.6 47.6 32 1.3/4 368
40 1092 1174.8 50.8 32 1.7/8 387
42 1143 1225.6 50.8 32 1.7/8 394
44 1200 1282.7 54 32 2 413
46 1257 1339.8 54 36 2 425
48 1308 1403.4 60.3 28 2.1/4 451
50 1362 1460.5 60.3 32 2.1/4 457
52 1413 1511.3 60.3 32 2.1/4 470
54 1470 1581.2 66.7 28 2.1/2 502
56 1527 1632 66.7 32 2.1/2 508
58 1578 1682.8 66.7 32 2.1/2 514
60 1635 1752.6 73 32 2.3/4 546

Important Information

Indications..

  • OD = Diameter at Weld Bevel
  • D = Overall Diameter of Flange
  • B (WNF) = Minimum Thickness of Welding Neck Flange
  • B (BLF) = Minimum Thickness of Blind Flange
  • H = Length thru Hub
  • A = Diameter at Base of Hub
  • G = Outside Diameter of Raised Face
  • K = Bolt Circle Diameter
  • L = Diameter of Bolt Holes

General notes..

  • Dimensions are in millimeters unless otherwise indicated.
  • For dimensions "B" and "H" click IMPORTANT.
  • Blind flanges ASME B16.47 series A flanges (≥ NPS 26) are MSS SP-44 flanges.
    ASME has incorporated the MSS-SP44 specification into B16.47 Series A and the API 605 Specification into B16.47 series B.
    These specification include only Welding Neck and Blind Flanges.
  • Dimensions for Classes 400, 600 and 900 NPS 38 and larger for Series B flanges are the same as for the Series A flanges.
  • The length of the Stud Bolt does not include the height of the chamfers (points).


Studs are measured parallel to the axis (L) from the first to the thread without the chamfers (points). S = free threads equals 1/3 time bolt dia

Measuring lengths of Stud Bolts


Hex bolts are measured from under the head to the top of de bolt


Measuring lengths of Hex bolts


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