Shoulder bolts have a precision-ground unthreaded shoulder between the head and the thread, giving a accurate bearing surface for rotating parts, linkages, bearings and pivot points. The shoulder diameter and length are the controlled dimensions, not the thread.
Supplied in bulk to distributors, importers and hardware brands worldwide, including private-label packaging in the customer's own branding. Non-standard sizes and made-to-drawing variants are produced to order, with a material test certificate on every consignment.
| Product Type | Hexagon socket head shoulder screw with precision ground shoulder |
| Standards | ISO 7379, ASME B18.3 |
| Material Grades | Alloy steel Grade 12.9, hardened and tempered; SS 304 (A2); SS 316 (A4) |
| Size Range (Metric) | Shoulder Ø 6 mm to 25 mm (thread M5 to M20) |
| Size Range (Imperial) | Shoulder Ø 1/4" to 1" (thread #10 to 3/4" UNC) |
| Length Range | Shoulder length 10 mm to 150 mm (1/4" to 6") |
| Head / Drive Type | Socket head, hexagon socket drive; shoulder tolerance f9 (ISO 7379) |
| Finish | Black oxide with ground shoulder; nickel or zinc plated on request |
| Custom Options | Non-standard shoulder diameter and length, slotted or hex heads, made to drawing |
| Certification | Material Test Certificate, EN 10204 3.1 |
| Packaging | Boxed in standard counts, bulk cartons, or private label to customer specification |
