Square Head Bolts (Square Head Machine Bolts DIN 479)
Square head bolts with a distinctive 4-sided head designed for applications where a wrench grip from one side is sufficient and a traditional hex head may strip under high torque. Conforming to DIN 479 standard, these bolts are widely used in agricultural equipment, wood construction, structural frameworks, and vintage machinery restoration where a classic square head profile is preferred or required.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 479, ASME B18.2.1 |
| Thread Type | Metric Coarse / UNC |
| Size Range | M6 – M36 |
| Length Range | 20mm – 300mm |
| Material | Carbon Steel (Grade 4.8, 8.8, 10.9) |
| Stainless Steel | SS304 (A2-70), SS316 (A4-80) |
| Surface Finish | Black Oxide, Zinc Plated, Hot Dip Galvanized, Plain |
| Head Type | Square Head (4-Sided) |
| MOQ | 500 pcs (standard), 2,000 pcs (custom) |
| Lead Time | 7-15 days (standard), 20-30 days (custom) |
| Packaging | Bulk cartons / Wooden pallets / Custom labeling |
Available Sizes
M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36
Applications
- Agricultural equipment and machinery
- Wood construction and timber framing
- Railway and track fastening systems
- Vintage machinery and restoration
- Heavy structural frameworks
- Mining equipment
Certifications
ISO 9001:2015 certified. Material certificates (EN 10204 3.1/3.2). RoHS and REACH compliant.
Frequently Asked Questions
Why use square head bolts instead of hex?
The square head can be held or turned from many positions with simple tools, will not roll, and suits tight spots where a wrench cannot swing a full arc. They remain popular in machinery, restoration work and timber construction.
What sizes are available?
Available sizes range from M6 – M36. Contact us with your required sizes and quantities for a quick quote.
What is the MOQ and lead time?
The MOQ is 500 pcs (standard), 2,000 pcs (custom). Lead time is 7-15 days (standard), 20-30 days (custom). Mixed-size containers and larger orders are negotiable — send us your requirement for a quick quote.
Do you provide material certificates?
Yes. Material test certificates per EN 10204 3.1 are available on request, and our manufacturing is ISO 9001:2015 certified. RoHS and REACH compliance documentation can also be provided.
