Product Description
Cap head shoulder bolts - also called shoulder screws or stripper bolts - are precision fasteners with a ground cylindrical shoulder between the socket cap head and the threaded end. The shoulder acts as a pivot, bearing journal or spacer, holding parts at an exact distance while letting them rotate or slide. The thread is cut one size smaller than the shoulder, so the joint clamps firmly without damaging the bore.
Product Parameters
|
Parameter |
Specification |
|
Standard |
ISO 7379 socket head shoulder screw; ISO 8736 slotted variant (DIN 912 head form) |
|
Shoulder diameter (D) |
4–20 mm; 4, 5, 6, 8, 10, 12, 16, 20 mm in stock |
|
Shoulder tolerance |
h8 standard / f7 precision running fit |
|
Shoulder length (L) |
5–100 mm, custom lengths available |
|
Length tolerance |
±0.1 mm standard / ±0.05 mm precision |
|
Thread size (M) |
One size smaller than shoulder (8 mm shoulder to M6) |
|
Thread length |
1.5 × thread diameter |
|
Material |
Alloy steel SCM435 / 40Cr, HSS SKH51, stainless 304 / 440C |
|
Hardness |
Quenched and tempered; HRC 32–39 surface / 28–35 core |
|
Shoulder roughness |
Ra ≤ 1.6 μm (ground) |
|
Surface finish |
Black oxide, nickel plated, plain (stainless) |
Product Advantages
Ground to h8 / f7. Alignment stays repeatable in dies, fixtures and linkages.
Quenched and tempered to HRC 32–39. Impact-tough and wear-resistant.
Socket cap head. Takes high torque yet stays low-profile in tight assemblies.
Thread one size under the shoulder. The shank passes the bore without cutting it.
Three material groups. Alloy steel, HSS or 304 / 440C stainless for wear, heat or corrosion.
Made to your drawing. Custom diameters and lengths, sample before mass production.
Product Applications
Injection moulds and stamping dies: stripper bolts that set the stripping distance
Punch press tooling and die sets
Bearing journals, pivots and linkage joints
Automation and robotics: linear guides, grippers, positioning assemblies
Welding and machining fixtures, jigs and spacers
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