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


Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 970 95.25 104.85 200.35 727
28 711.2 1035 101.65 111.15 212.35 783
30 762 1090 107.95 117.55 225.35 837
32 812.8 1150 114.35 122.25 238.35 889
34 863.6 1205 117.55 128.65 247.35 945
36 914.4 1270 120.65 134.95 257.35 1000
38 965.2 1205 130.25 130.25 212.35 1003
40 1016 1270 136.55 136.55 222.35 1054
42 1066.8 1320 139.75 139.75 230.35 1108
44 1117.6 1385 146.05 146.05 239.35 1159
46 1168.4 1440 152.45 152.45 250.35 1213
48 1219.2 1510 158.75 158.75 263.35 1267
50 1270.2 1570 163.55 165.15 274.35 1321
52 1320.8 1620 168.35 169.95 282.35 1372
54 1371.6 1700 176.25 177.85 295.35 1426
56 1422.4 1755 181.05 182.65 304.35 1480
58 1473.2 1805 184.15 187.35 312.35 1530
60 1524 1885 192.15 195.35 325.35 1584


Blind flange

NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 876.3 47.6 28 1.3/4 317
28 800 939.8 50.8 28 1.7/8 336
30 857 997 54 28 2 355
32 914 1054.1 54 28 2 361
34 965 1104.9 54 28 2 374
36 1022 1168.4 54 32 2 381
38 1035 1117.6 47.6 32 1.3/4 374
40 1092 1174.8 50.8 32 1.7/8 393
42 1143 1225.6 50.8 32 1.7/8 400
44 1200 1282.7 54 32 2 419
46 1257 1339.8 54 36 2 431
48 1308 1403.4 60.3 28 2.1/4 457
50 1362 1460.5 60.3 32 2.1/4 469
52 1413 1511.3 60.3 32 2.1/4 476
54 1470 1581.2 66.7 28 2.1/2 508
56 1527 1632 66.7 32 2.1/2 514
58 1578 1682.8 66.7 32 2.1/2 520
60 1635 1752.6 73 32 2.3/4 552

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 A flanges are the same as for the Series B 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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