Shoulder bolts, or shoulder screws, have a long, unthreaded, cylindrical shoulder that allows for the rotation of attached parts like pulleys, gears, moving parts of engines and mechanical assemblies, and rolling wheels. These screws are also used to attach stripper plates. The socket head enables high torque fastening with limited clearance.

Material: Alloy steel, SUS304, SUS 316

Metric size from M5 to M20

Inch size from 1/8" to 2"

Standard:

ISO 7379 - 1983 Hexagon Socket Head Shoulder Screws

Screw Thread
d

M5 M6 M8 M10 M12 M16 M20

P Pitch

d_s Nominal Size

max

min

b max

min

d_k For plain heads max

For knurled heads max

min

k max

min

s Nominal Size

max

min

t min

0.8 1 1.25 1.5 1.75 2 2.5

6.5 8 10 13 16 20 25

6.487 7.987 9.987 12.984 15.984 19.980 24.980

6.451 7.951 9.951 12.941 15.941 19.928 24.928

9.75 11.25 13.25 16.40 18.40 22.40 27.40

9.25 10.75 12.75 15.60 17.60 21.60 26.60

10 13 16 18 24 30 36

10.22 13.27 16.27 18.27 24.33 30.33 36.39

9.78 12.73 15.73 17.73 23.67 29.67 35.61

4.5 5.5 7 9 11 14 16

4.32 5.32 6.78 8.78 10.73 13.73 15.73

3 4 5 6 8 10 12

3.08 4.095 5.095 6.095 8.115 10.115 12.142

3.02 4.02 5.02 6.02 8.025 10.025 12.032

2.4 3.3 4.2 4.9 6.6 8.8 10

ASME B 18.3 - 2012 Hexagon Socket Head Shoulder Screws

For thread diameter

d_s	max
d_s	min
d_k	max
d_k	min
k	max
k	min
s	Nominal Size
t	min
d	Nominal Size
d	Nominal Diameter
PP	Threads per in.
b	thread length

0.123	0.154	0.185	0.248	0.3105	0.373	0.498	0.623	0.748	0.998	1.248	1.498	1.748	1.998
0.121	0.152	0.183	0.246	0.3085	0.371	0.496	0.621	0.746	0.996	1.246	1.496	1.746	1.996
0.25	0.281	0.312	0.375	0.438	0.562	0.75	0.875	1	1.312	1.75	2.125	2.375	2.75
0.235	0.266	0.296	0.357	0.419	0.543	0.729	0.853	0.977	1.287	1.723	2.095	2.345	2.72
0.125	0.125	0.156	0.188	0.219	0.25	0.312	0.375	0.5	0.625	0.75	1	1.125	1.25
0.115	0.115	0.146	0.177	0.209	0.24	0.302	0.365	0.49	0.61	0.735	0.98	1.105	1.23
0.078	0.094	0.094	0.125	0.156	0.188	0.25	0.312	0.375	0.5	0.625	0.875	1	1.25
0.067	0.067	0.079	0.094	0.117	0.141	0.188	0.234	0.281	0.375	0.469	0.656	0.75	0.937
4	6	8	10	1/4	5/16	3/8	1/2	5/8	3/4	7/8	1-1/8	1-1/4	1-1/2
0.112	0.138	0.164	0.19	0.25	0.3125	0.375	0.5	0.625	0.75	0.875	1.125	1.25	1.5
40	32	32	24	20	18	16	13	11	10	9	7	7	6
0.157	0.187	0.189	0.375	0.438	0.5	0.625	0.75	0.875	1	1.125	1.5	1.75	2

WELLBOLT CO.,LTD

Shoulder bolt

Products

Shoulder bolt

ISO 7379 - 1983 Hexagon Socket Head Shoulder Screws

ASME B 18.3 - 2012 Hexagon Socket Head Shoulder Screws

Shoulder bolt

Products

Shoulder bolt

ISO 7379 - 1983 Hexagon Socket Head Shoulder Screws

ASME B 18.3 - 2012 Hexagon Socket Head Shoulder Screws

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