Dimensions Weld Neck & Blind flanges ASME B16.47 Series A Class 900


Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 1085 146.05 166.75 292.35 775
28 711.2 1170 149.25 177.85 304.35 832
30 762 1230 155.65 188.95 317.35 889
32 812.8 1315 165.15 200.05 336.35 946
34 863.6 1395 171.45 211.15 355.35 1006
36 914.4 1460 177.85 220.75 368.35 1064
38 965.2 1460 196.85 222.25 358.35 1073
40 1016 1510 203.25 230.25 370.35 1127
42 1066.8 1560 212.75 238.15 377.35 1176
44 1117.6 1650 220.75 249.25 397.35 1235
46 1168.4 1735 231.95 261.95 417.35 1292
48 1219.2 1785 239.75 269.95 425.35 1343


Blind flange

NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 952.5 73 20 2.3/4 476
28 800 1022.4 79.4 20 3 501
30 857 1085.8 79.4 20 3 520
32 914 1155.7 85.7 20 3.1/4 558
34 965 1225.6 92.1 20 3.1/2 584
36 1022 1289 92.1 20 3.1/2 603
38 1099 1289 92.1 20 3.1/2 622
40 1162 1339.8 92.1 24 3.1/2 635
42 1213 1390.6 92.1 24 3.1/2 654
44 1270 1463.7 98.4 24 3.3/4 685
46 1334 1536.7 104.8 24 4 723
48 1384 1587.5 104.8 24 4 736

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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