Dimensions Weld Neck & Blind flanges ASME B16.47 Series A Class 600


Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 1015 114.35 131.85 228.35 748
28 711.2 1075 117.55 138.15 241.35 803
30 762 1130 120.65 146.05 254.35 862
32 812.8 1195 123.85 154.05 266.35 918
34 863.6 1245 127.05 160.35 276.35 973
36 914.4 1315 130.25 168.35 289.35 1032
38 965.2 1270 158.75 161.35 260.35 1022
40 1016 1320 165.15 168.35 270.35 1073
42 1066.8 1405 174.65 177.85 285.35 1127
44 1117.6 1455 179.45 184.15 295.35 1181
46 1168.4 1510 185.75 192.15 306.35 1235
48 1219.2 1595 195.35 201.65 322.35 1289
50 1270.2 1670 203.25 209.55 335.35 1343
52 1320.8 1720 209.55 215.95 343.35 1394
54 1371.6 1780 215.95 223.85 355.35 1448
56 1422.4 1855 223.75 231.85 368.35 1502
58 1473.2 1905 228.65 238.15 376.35 1553
60 1524 1995 239.75 249.25 395.35 1610


Blind flange

NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 914.4 50.8 28 1.7/8 368
28 800 965.2 54 28 2 381
30 857 1022.4 54 28 2 393
32 914 1079.5 60.3 28 2.1/4 419
34 965 1130.3 60.3 28 2.1/4 425
36 1022 1193.8 66.7 28 2.1/2 450
38 1054 1162 60.3 28 2.1/4 463
40 1111 1212.8 60.3 32 2.1/4 476
42 1168 1282.7 66.7 28 2.1/2 501
44 1226 1333.5 66.7 32 2.1/2 514
46 1276 1390.6 66.7 32 2.1/2 527
48 1334 1460.5 73 32 2.3/4 565
50 1384 1524 79.4 28 3 590
52 1435 1574.8 79.4 32 3 603
54 1492 1632 79.4 32 3 615
56 1543 1695.4 85.7 32 3.1/4 647
58 1600 1746.2 85.7 32 3.1/4 660
60 1657 1822.4 92.1 28 3.1/2 692

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).
  • The length of the Stud Bolts includes one Spiral Wound Gasket with a 4.5mm thick sealing element, which is compressed to 3mm while tightening the Raised Face flange connection.


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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