Square Shoulder Bolt Carriage Bolt

Carriage Bolt, also called round head square neck bolt, is a dedicated anti-rotation fastener widely used for wood and metal composite assembly, especially suitable for long-term outdoor and humid working environments.

This bolt is made of integral SUS304 stainless steel. Its wide smooth domed round head has no sharp edges, which avoids scratching operators and matched materials. The built-in square neck under the head is the core anti-slip structure: when inserted into pre-punched square holes of boards, the square neck is embedded tightly into the workpiece to fix the bolt body, so the bolt will not spin while tightening nuts without auxiliary clamping tools. The full standard rolling thread matches perfectly with hex nuts and flat washers to provide stable lasting clamping force.

Different from carbon steel carriage bolts, SUS304 stainless steel material features outstanding rust, salt fog and weak acid corrosion resistance, which can maintain stable performance in coastal areas, rainy outdoor scenes and damp workshops without extra plating treatment. The design of large round head can disperse compression and effectively prevent the bolt head from sinking into soft wood panels.

All finished stainless steel carriage bolts pass tensile strength and thread accuracy inspection before delivery, meeting outdoor construction and furniture fastening safety standards. Custom thread lengths and head dimensions can be produced to adapt to different plate thickness and load requirements for bulk export orders.