Value Collection 489061PR Carriage Bolt 5/16-18 6 in

Product Description

The VALUE COLLECTION 489061PR is a 5/16-18 UNC carriage bolt with a 6-inch length under head and a square neck designed to resist rotation during fastening without requiring tool access from below. Manufactured from Grade 2 steel with a zinc-plated finish, it meets ASTM A307 standards for general-purpose structural and mechanical fastening. The round, domed head sits flush against the mating surface while the square neck bites into wood or soft substrates to prevent spinning during nut tightening. This bolt is a standard inch-system fastener used across construction, woodworking, and light structural assembly applications.

This fastener is suited for light to medium-duty applications in residential construction, framing, deck building, fence installation, and general fabrication. The 5/16-18 coarse thread and 6-inch shank length accommodate connections through thicker stock or layered materials. The zinc-plated finish provides a baseline level of corrosion resistance appropriate for interior or covered exterior use. Trade professionals including carpenters, general contractors, and maintenance technicians commonly use this bolt where through-bolting with a washer and nut is required.

Key Features

• 5/16-18 UNC coarse thread for reliable engagement in standard tapped holes or with standard hex nuts
• 6-inch length under head suits connections through thick lumber or stacked material
• Square neck prevents rotation when driven into wood substrates, allowing single-side installation
• Grade 2 steel construction meets ASTM A307 fastener standard
• Zinc-plated finish provides basic corrosion resistance for general indoor and covered applications

Compatibility

Designed as a general-purpose inch-system carriage bolt compatible with standard 5/16-18 UNC hex nuts and washers in wood-to-wood or wood-to-metal fastening applications.

Installation Notes

Installation typically requires a hammer to seat the square neck flush into the substrate and a wrench or socket to tighten the mating nut. Always use an appropriate flat washer under the nut to prevent pull-through on softer materials. Follow applicable building codes for structural fastener spacing and load requirements. Inspect the zinc finish for damage before installation in damp or outdoor environments where additional corrosion protection may be required.