Dimensions Stud Bolts for RF flanges ASME B16.47 Series A Class 150-900

Stud bolt with two nuts

Series A

Class 150
NPS No of
Bolts
Stud Bolt
Dia x L
26 24 1.1/4 222
28 28 1.1/4 228
30 28 1.1/4 234
32 28 1.1/2 266
34 32 1.1/2 266
36 32 1.1/2 279
38 32 1.1/2 279
40 36 1.1/2 279
42 36 1.1/2 292
44 40 1.1/2 304
46 40 1.1/2 304
48 44 1.1/2 317
50 44 1.3/4 336
52 44 1.3/4 349
54 44 1.3/4 355
56 48 1.3/4 361
58 48 1.3/4 374
60 52 1.3/4 381
Class 300
NPS No of
Bolts
Stud Bolt
Dia x L
26 28 1.5/8 273
28 28 1.5/8 285
30 28 1.3/4 304
32 28 1.7/8 317
34 28 1.7/8 330
36 32 2 342
38 32 1.1/2 317
40 32 1.5/8 336
42 32 1.5/8 349
44 32 1.3/4 361
46 28 1.7/8 381
48 32 1.7/8 387
50 32 2 406
52 32 2 419
54 28 2.1/4 444
56 28 2.1/4 450
58 32 2.1/4 457
60 32 2.1/4 469
Class 400
NPS No of
Bolts
Stud Bolt
Dia x L
26 28 1.3/4 317
28 28 1.7/8 336
30 28 2 355
32 28 2 361
34 28 2 374
36 32 2 381
38 32 1.3/4 374
40 32 1.7/8 393
42 32 1.7/8 400
44 32 2 419
46 36 2 431
48 28 2.1/4 457
50 32 2.1/4 469
52 32 2.1/4 476
54 28 2.1/2 508
56 32 2.1/2 514
58 32 2.1/2 520
60 32 2.3/4 552
Class 600
NPS No of
Bolts
Stud Bolt
Dia x L
26 28 1.7/8 368
28 28 2 381
30 28 2 393
32 28 2.1/4 419
34 28 2.1/4 425
36 28 2.1/2 450
38 28 2.1/4 463
40 32 2.1/4 476
42 28 2.1/2 501
44 32 2.1/2 514
46 32 2.1/2 527
48 32 2.3/4 565
50 28 3 590
52 32 3 603
54 32 3 615
56 32 3.1/4 647
58 32 3.1/4 660
60 28 3.1/2 692
Class 900
NPS No of
Bolts
Stud Bolt
Dia x L
26 20 2.3/4 476
28 20 3 501
30 20 3 520
32 20 3.1/4 558
34 20 3.1/2 584
36 20 3.1/2 603
38 20 3.1/2 622
40 24 3.1/2 635
42 24 3.1/2 654
44 24 3.3/4 685
46 24 4 723
48 24 4 736

General notes..

  • Dimensions are in millimeters unless otherwise indicated.
  • Length dimensional tolerances for all Stud Bolts..
    length to 12 inch tolerance = ± 1.6 mm
    length over 12 inch to 18 inch tolerance = ± 3.2 mm
    length over 18 inch tolerance = ± 6.4 mm
  • 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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