| Item | Specification Details |
|---|---|
| Product Name | Carriage Bolt / Round Head Square Neck Bolt |
| Material | SUS304 Stainless Steel |
| Surface Finish | Polished stainless steel, corrosion resistant |
| Standard Sizes | M6, M8, M10, M12, M14, M16; Custom thread length available |
| Structure | Wide round smooth head + square anti-rotation neck + full thread shank |
| Applicable Materials | Wood, steel sheet, fence, outdoor furniture, seaside equipment, agricultural frames |
| Core Features | Large round head for uniform pressure distribution; square neck locks bolt to prevent spinning during tightening; burr-free smooth head avoids scratches; excellent rust & salt spray resistance; precise full rolling thread |
| Application Scenarios | Garden wooden furniture, metal guardrail assembly, coastal facilities, timber-metal composite connection, playground equipment, farm machinery |
| Custom Service | OEM & ODM, custom thread length, customized head diameter, laser marking on head |
Carriage Bolt
Carriage Bolt, also known as round head square neck bolt, is an anti-rotation fastener specially designed for wood and metal combined assembly.
This bolt is made of one-piece SUS304 stainless steel. The oversized smooth domed round head has no sharp edges, which can effectively disperse pressure and prevent sinking into soft wood, while avoiding scratch damage to operators and matching components. The square neck under the head is the core functional structure: after inserting into pre-punched square holes of plates, the square neck is fully embedded to lock the bolt body, so the bolt will not rotate when twisting nuts without extra fixing tools.
The full standard rolling thread matches perfectly with hex nuts and flat washers to provide stable long-term clamping force. Compared with carbon steel carriage bolts, 304 stainless steel has outstanding anti-rust and anti-salt spray performance, suitable for long-term outdoor, humid and coastal corrosive environments without electroplating protection.
It is widely used in outdoor fences, garden furniture, seaside engineering and public amusement facilities. All finished carriage bolts pass tensile strength and thread precision inspection before shipment, meeting outdoor construction and furniture fastening standards. Custom thread lengths and head sizes can be produced to match different plate thickness and load requirements for bulk export orders.
