Bolts
Square Head Bolts
Square Head Fasteners for Heavy-Duty Applications
Our Square Head Bolts feature a distinctive square-shaped head that provides a larger bearing surface than standard hex bolts, delivering superior grip for wrench or spanner tightening. Manufactured through precision cold heading, these bolts are widely used in heavy-duty industrial applications including mining equipment, agricultural machinery, railroad construction, and structural steel connections where reliable, high-strength fastening is essential.
Key Features
Larger bearing surface for superior load distribution
Cold-headed for enhanced tensile strength
Easy wrench engagement with square profile
Available in stainless steel A2-70 grade
Custom lengths and sizes available on request
Technical Specifications
| Product Name | Square Head Bolts |
| Chinese Name | 方头螺栓 |
| Brand | ZCM / Zhongchun |
| Grade | 4.8 / 8.8 / 10.9 |
| Material | Carbon Steel, Stainless Steel (304/316, A2-70), Alloy Steel |
| Size Range | M6 - M24 |
| Thread | Full Thread / Partial Thread |
| Head Type | Square Head |
| Surface Treatment | Plain, Zinc Plated (White/Yellow/Blue), HDG, Dacromet, Black Oxide |
| Standards | GB8 / DIN 478 / DIN 479 / ASME B18.2.1 / Custom |
| Packaging | Carton + Pallet, or per customer request |
| MOQ | Contact us for details |
| Lead Time | 15 days for standard orders |
Applications
Square Head Bolts are trusted in demanding industries where reliable, heavy-duty fastening is critical.
Heavy machinery and equipment mounting
Mining and quarrying equipment assembly
Agricultural machinery and implements
Railroad track and rail fastening
Structural steel connections
Timber and wood construction joints
Industrial plant maintenance
Power transmission and transformer mounting
Interested in Square Head Bolts?
Send us your specifications for a competitive quote. Standard orders delivered in 15 days.