Value Collection 489020PS Carriage Bolt 1/4-20 1 in Zinc Grade 2

Product Description

The VALUE COLLECTION 489020PS is a 1/4-20 UNC carriage bolt with a 1-inch length under head and a square neck design. Made from Grade 2 steel with a zinc-plated finish, this fastener is built for general-purpose structural and mechanical assembly work. The square neck seats into pre-drilled square holes or bites into wood to prevent rotation during tightening, eliminating the need for a wrench on the bolt head. It meets ASTM A307 standards, making it a reliable choice for light-duty fastening applications across construction, fabrication, and maintenance trades.

This carriage bolt is suited for wood-to-wood and wood-to-metal connections in residential construction, light commercial framing, decking, fencing, and general shop fabrication. The zinc plating provides basic corrosion resistance for indoor and sheltered outdoor use. It is commonly installed by carpenters, general contractors, millwrights, and maintenance technicians where a smooth, rounded bolt head on the show face is required.

Key Features

• 1/4-20 UNC thread with 1-inch length under head for shallow-depth fastening applications
• Square neck locks into material to resist rotation without a secondary tool on the bolt
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc-plated finish provides basic corrosion resistance for sheltered environments
• Inch measurement system; length measured from under the head

Compatibility

Designed as a standard 1/4-20 UNC carriage bolt for general-purpose wood and light structural assemblies requiring an ASTM A307-compliant fastener.

Installation Notes

A pre-drilled hole matching the bolt diameter is required; the square neck is driven flush into wood or seated in a square-punched hole in metal to prevent spinning. Tighten using a nut and washer on the threaded end with a standard wrench or socket. Do not use impact tools at full torque without a seated neck, as this can strip the hole and allow rotation. Follow applicable building codes and project specifications for fastener grade and spacing requirements.