| Item | Specification Details |
|---|---|
| Product Name | Carriage Bolt / Round Head Square Neck Bolt |
| Material | SUS304 Stainless Steel |
| Surface Finish | Bright Polished Stainless Steel, Rust & Corrosion Resistant |
| Standard Sizes | M6, M8, M10, M12, M14, M16; Extra long customized thread lengths available |
| Component Structure | Wide smooth domed round head + integrated square anti-rotation neck + full-length threaded shank |
| Applicable Base | Timber panels, metal sheet, outdoor guardrails, garden furniture, coastal engineering equipment, agricultural machinery frames |
| Core Features | Burr-free large round head to distribute pressure evenly; square neck locks bolt to prevent rotation during nut tightening; full uniform rolling thread; outstanding salt spray & acid resistance; long threaded section for thick multi-layer assembly |
| Application Scenarios | Outdoor fence installation, wooden outdoor furniture assembly, seaside anti-corrosion projects, thick timber & metal composite connection, public playground facilities, farm heavy-duty equipment fixing |
| Custom Service | OEM & ODM, ultra-long custom thread length, customized head diameter, laser marking on bolt head, special non-standard sizes |
Carriage Bolt
Carriage Bolt, also known as round head square neck bolt, is an anti-rotation special fastener designed for wood-metal composite connection, this version adopts extra long full thread design to satisfy thick workpiece assembly demands.
It is integrally formed from SUS304 stainless steel. The wide smooth round head eliminates sharp edges, avoids scratching operators and workpieces, and disperses clamping pressure to prevent sinking into soft wood. The square neck under the head is the core anti-slip structure: after inserting into pre-punched square holes of plates, the square neck is embedded firmly to lock the bolt body, so the bolt will not spin when tightening nuts without auxiliary fixing tools.
The full long rolling thread can pass through multiple thick layers of materials, matching standard hex nuts and flat washers to provide stable and lasting clamping force. Unlike carbon steel carriage bolts, 304 stainless steel material delivers superior anti-rust and anti-salt-spray performance, which can maintain stable service performance in coastal, rainy outdoor and humid corrosive environments without electroplating protection.
All finished carriage bolts pass tensile strength and thread precision inspection before delivery, complying with outdoor construction and furniture fastening safety standards. Extra long customized thread lengths and different head dimensions can be produced to match various thick plate thickness and heavy load requirements for bulk export orders.
