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


Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 970 79.4 84.2 184.6 721
28 711.2 1035 85.8 90.5 196.6 775
30 762 1090 92.1 95.3 209.6 827
32 812.8 1150 98.5 100.1 222.6 881
34 863.6 1205 101.7 104.8 231.6 937
36 914.4 1270 104.8 111.2 241.6 991
38 965.2 1170 108 108 180.6 994
40 1016 1240 114.4 114.4 193.6 1048
42 1066.8 1290 119.1 119.1 199.6 1099
44 1117.6 1355 123.9 123.9 206.6 1149
46 1168.4 1415 128.6 128.6 215.6 1203
48 1219.2 1465 133.4 133.4 223.6 1254
50 1270.2 1530 139.8 139.8 231.6 1305
52 1320.8 1580 144.5 144.5 238.6 1356
54 1371.6 1660 152.5 152.5 252.6 1410
56 1422.4 1710 154 154 260.6 1464
58 1473.2 1760 158.8 158.8 266.6 1514
60 1524 1810 163.6 163.6 272.6 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..

  • 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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