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



Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 661.9 785 41.4 44.6 88.6 684
28 712.7 835 44.6 47.8 95.6 735
30 763.5 885 44.6 50.9 99.6 787
32 814.3 940 46.2 54.1 107.6 840
34 865.1 1005 49.3 57.3 110.6 892
36 915.9 1055 52.5 58.9 117.6 945
38 968.2 1125 54.1 63.6 123.6 997
40 1019 1175 55.7 66.8 128.6 1049
42 1069.8 1225 58.9 68.4 133.6 1102
44 1120.6 1275 60.5 71.6 136.6 1153
46 1171.4 1340 62 74.7 144.6 1205
48 1222.2 1390 65.2 77.9 149.6 1257
50 1273 1445 68.4 81.1 153.6 1308
52 1323.8 1495 70 84.3 157.6 1360
54 1374.6 1550 71.6 87.4 161.6 1413
56 1425.4 1600 73.2 90.6 166.6 1465
58 1476.2 1675 74.7 93.5 174.6 1516
60 1527 1725 76.3 97 179.6 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 1.1/4 229
60 1600 1662.1 34.9 52 1.1/4 235

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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