Freer Tool & Supply’s NAAMS socket head shoulder screws collection is built for fixture builders who need more than “just a fastener.” These shoulder screws (shoulder bolts) combine a threaded section for clamping with a precision-ground shoulder that acts as a locating surface or bearing journal. That makes them ideal for pivot points, guided slides, linkages, and moving components in welding fixtures, assembly tooling, and automation stations—where repeatability and smooth cycling are critical.
NAAMS socket head shoulder screws are made from heat-treated alloy steel and adhere to ANSI B18.3.3M dimensional and material specifications. Body sizes range from 6 to 24, with lengths from 10 mm to 120 mm. Refer to the chart for detailed body size dimensions.
Body Sz.
Nom. Thread Size
Pitch
A Max
F Min
B
G Min
H Max
J Min
M Max
N Max
T Max
W Nom.
Recom. Torque (Nm)
Tap Sz.
Max
Min
6
M5
0.8
10
2.4
6
5.982
5.42
4.5
3.68
2.5
2.4
9.75
3
7
4.2
8
M6
1
13
3.3
8
7.978
7.42
5.5
4.4
2.5
2.6
11.25
4
12
5
10
M8
1.25
16
4.2
10
9.978
9.42
7
6.03
2.5
2.8
13.25
5
29
6.75
12
M10
1.5
18
4.9
12
11.973
11.42
8
7.69
2.5
3
16.4
6
57
8.5
16
M12
1.75
24
6.6
16
15.973
15.42
10
9.35
2.5
4
18.4
8
100
10.25
20
M16
2
30
8.8
20
19.967
19.42
14
12.96
2.5
4.8
22.4
10
240
14
24
M20
2.5
36
10
24
23.967
23.42
16
16.3
3
5.6
27.4
12
470
17.5
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