| Item | Specification Details |
|---|---|
| Product Name | Carriage Bolt / Round Head Square Neck Bolt |
| Material | High Strength Carbon Steel Q235 |
| Surface Finish | Blue White Zinc Plated |
| Standard Sizes | M6, M8, M10, M12, M16; Custom thread length available |
| Component Structure | Wide smooth domed round head + integrated square anti-rotation neck + full thread shank |
| Applicable Base | Timber, metal sheet, guardrail, garden furniture, agricultural machinery, playground facilities |
| Core Features | Large flat round head for uniform pressure dispersion; square neck locks workpiece to prevent bolt spinning during tightening; burr-free safe head without sharp edges; precise full rolling thread for stable nut matching; cost-effective anti-rust plating |
| Application Scenarios | Outdoor fence & railing assembly, wooden garden furniture fixing, farm equipment connection, timber-metal composite structure installation, public leisure facility construction |
| Custom Service | OEM & ODM, custom thread length, customized head diameter, special surface anti-corrosion treatment |
Carriage Bolt
Carriage Bolt, also known as round head square neck bolt, is a dedicated anti-rotation fastener widely used for wood and metal composite assembly.
Manufactured from one-piece forged carbon steel, this bolt features a wide smooth domed round head with no sharp edges, effectively avoiding scratches on operators and matching materials while evenly distributing clamping pressure to prevent sinking into soft wood substrates. The integrated square neck under the head is its core functional structure: once inserted into pre-punched square holes on plates or brackets, the square neck embeds firmly into the workpiece to lock the bolt body completely, eliminating bolt rotation when tightening nuts without extra clamping tools.
The full precision rolling thread fits perfectly with standard hex nuts and flat washers to deliver long-lasting stable clamping force. Blue white zinc plating forms a compact anti-rust protective layer on the carbon steel substrate, resisting oxidation and mild outdoor humidity for general workshop and outdoor applications.
Compared with stainless steel carriage bolts, carbon steel versions provide a more economical solution for non-corrosive ordinary environments. All finished carriage bolts pass tensile strength and thread accuracy testing before delivery, complying with construction and furniture fastening safety standards. Custom thread lengths and head dimensions can be produced to fit different plate thicknesses and load requirements for bulk orders.
