Value Collection 489068PR Carriage Bolt 3/8-16 3/4 in Square Neck

Product Description

The VALUE COLLECTION 489068PR is a 3/8-16 UNC carriage bolt with a 3/4-inch length under head and a square neck designed to pull flush into wood or soft materials, preventing rotation during installation. Made from Grade 2 steel with a zinc finish coating, this bolt meets ASTM A307 standards and is suited for general-purpose structural and assembly fastening applications. The rounded dome head provides a finished appearance on the face side, while the square neck locks into pre-drilled square holes or soft material to allow single-sided tightening with a standard wrench or socket.

This carriage bolt is used in a wide range of residential and light commercial construction, woodworking, and equipment assembly applications where a smooth, low-profile head is required on the exposed surface. Typical uses include deck framing, fence rail connections, playground equipment, light structural brackets, and general mechanical assemblies where the bolt passes through wood, plastic, or light sheet material. Sold in minimum order quantities of 100 units per order.

Key Features

• 3/8-16 UNC thread for broad compatibility with standard nuts and hardware
• 3/4-inch length under head for thin-stock and flush fastening applications
• Square neck locks against rotation during single-sided tightening
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc finish coating provides basic corrosion resistance for indoor and dry-location use
• Inch measurement system; dome head delivers a clean finished face on the exposed side

Compatibility

Designed as a standard UNC carriage bolt for use with 3/8-16 hex nuts, washers, and standard hardware in wood, plastic, and light structural assemblies conforming to inch-measurement fastener specifications.

Installation Notes

Carriage bolts are typically installed by contractors, carpenters, and maintenance tradespeople. Drill a clean hole sized to allow the square neck to seat fully and prevent rotation before applying a nut and washer on the opposite side. Tighten the nut with a wrench or socket without holding the bolt head; the square neck engagement prevents spinning. For outdoor or high-moisture environments, evaluate whether a higher-grade or hot-dip galvanized fastener is more appropriate than zinc-plated Grade 2 steel.