Value Collection 489030PS Carriage Bolt 1/4-20 3-1/2 in Square Neck

Product Description

The VALUE COLLECTION 489030PS is a 1/4-20 UNC carriage bolt with a 3-1/2 inch length under head and a square neck profile. It is manufactured from Grade 2 steel with a zinc-plated finish that provides basic corrosion resistance for general-purpose fastening applications. The square neck seats into wood or soft material to prevent rotation during tightening, eliminating the need for a wrench on the bolt head. This bolt meets ASTM A307 standards and is measured using the inch system. It is a standard fastener used by contractors, maintenance technicians, and tradespeople across construction, HVAC equipment mounting, and general structural assemblies.

This carriage bolt is suited for light- to medium-duty fastening in wood-to-wood, wood-to-metal, and similar general construction connections. Typical applications include equipment supports, brackets, framing assemblies, and utility connections where a flush, round-head fastener is required. The zinc plating makes it acceptable for dry and mildly humid interior environments. This bolt is sold individually but requires a minimum order quantity of 100 pieces per order.

Key Features

• 1/4-20 UNC thread size for broad compatibility with standard nuts and threaded hardware
• 3-1/2 inch length under head for fastening through thicker substrates or stacked materials
• Square neck profile locks into wood or soft substrate to resist rotation during installation
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc-plated finish provides basic protection against corrosion in dry interior environments
• Inch measurement system with length measured under the head per standard fastener convention

Compatibility

Designed as a standard 1/4-20 UNC carriage bolt for use with any compatible 1/4-20 hex nut and flat or fender washer in general-purpose fastening applications.

Installation Notes

Installation is typically performed by a carpenter, general contractor, or maintenance technician using standard hand tools. Insert the bolt through a pre-drilled hole sized to allow the square neck to seat flush and prevent rotation, then thread on a nut and washer by hand before torquing with a wrench. Power down or de-energize any equipment before fastening mounting hardware to live assemblies. Do not use this zinc-plated fastener in continuously wet, submerged, or chemically aggressive environments where a higher-grade or stainless fastener would be required.