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

Stud bolt with two nuts

Series B

Class 150
NPS No of
Bolts
Stud Bolt
Dia x L
26 36 3/4 140
28 40 3/4 146
30 44 3/4 146
32 48 3/4 146
34 40 7/8 159
36 44 7/8 165
38 40 1 178
40 44 1 178
42 48 1 184
44 52 1 190
46 40 1.1/8 203
48 44 1.1/8 203
50 48 1.1/8 210
52 52 1.1/8 216
54 56 1.1/8 216
56 60 1.1/8 222
58 48 1.1/4 229
60 52 1.1/4 235
Class 300
NPS No of
Bolts
Stud Bolt
Dia x L
26 32 1.1/4 260
28 36 1.1/4 260
30 36 1.3/8 273
32 32 1.1/2 298
34 36 1.1/2 298
36 32 1.3/8 305
38 36 1.3/8 324
40 40 1.5/8 330
42 36 1.3/4 343
44 40 1.3/4 362
46 36 1.7/8 368
48 40 1.7/8 368
50 44 1.7/8 387
52 48 1.7/8 400
54 48 1.7/8 387
56 36 2.1/4 438
58 40 2.1/4 438
60 40 2.1/4 432
Class 400
NPS No of
Bolts
Stud Bolt
Dia x L
26 28 1.3/8 279
28 24 1.1/2 298
30 28 1.1/2 311
32 28 1.5/8 330
34 32 1.5/8 337
36 28 1.3/4 356
38 32 1.3/4 368
40 32 1.7/8 387
42 32 1.7/8 394
44 32 2 413
46 36 2 425
48 28 2.1/4 451
50 32 2.1/4 457
52 32 2.1/4 470
54 28 2.1/2 502
56 32 2.1/2 508
58 32 2.1/2 514
60 32 2.3/4 546
Class 600
NPS No of
Bolts
Stud Bolt
Dia x L
26 28 1.5/8 337
28 28 1.3/4 349
30 28 1.7/8 375
32 28 2 394
34 24 2.1/4 425
36 28 2.1/4 438
38 28 2.1/4 451
40 32 2.1/4 464
42 28 2.1/2 495
44 32 2.1/2 508
46 32 2.1/2 521
48 32 2.3/4 552
50 28 3 578
52 32 3 591
54 32 3 603
56 32 3.1/4 635
58 32 3.1/4 641
60 28 3.1/2 679
Class 900
NPS No of
Bolts
Stud Bolt
Dia x L
26 20 2.1/2 425
28 20 2.3/4 470
30 20 3 495
32 20 3 508
34 20 3.1/4 540
36 24 3 533
38 20 3.1/2 591
40 24 3.1/2 603
42 24 3.1/2 622
44 24 3.3/4 654
46 24 4 686
48 24 4 705
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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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