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 end of the bolt

Measuring lengths of Hex bolts

Submenu	Submenu	Submenu
safety	documents	materials
societies	pipes	flanges
fittings	valves	equipment
bolts	gaskets	fabrication
welding	N D T	specials
steel	steam	civil
dimensions	others

© 2025 wermac.org
Priv.. | Copr.. | About
Wer kämpft, kann verlieren, wer nicht kämpft, hat schon verloren. Bertolt Brecht

last updated October 27, 2025 1:52 PM