Value Collection 489125PR Carriage Bolt 1/2-13 6 in Square Neck

Product Description

The VALUE COLLECTION 489125PR is a 1/2-13 carriage bolt with a 6-inch length under the head, manufactured from Grade 2 steel with a zinc-plated finish. The square neck design locks the bolt in place against the mounting surface during installation, preventing rotation as the nut is tightened. Conforming to ASTM A307 standards, this fastener is suited for general structural and mechanical applications where a smooth, round head and positive anti-rotation seating are required. Plumbers, electricians, HVAC technicians, and general contractors reach for this bolt type when securing equipment frames, brackets, unistrut assemblies, and similar structural connections.

This carriage bolt is used in a wide range of light-to-medium structural fastening applications in both residential and commercial settings. Typical uses include securing wood-to-wood or wood-to-metal connections, equipment mounting, framing brackets, and utility supports. The zinc plating provides a basic level of corrosion resistance suitable for dry and intermittently moist indoor environments. The UNC (Unified National Coarse) 1/2-13 thread pitch is one of the most common thread standards in inch-measurement fastener applications, making compatible nuts and hardware easy to source.

Key Features

• Square neck under the domed head locks bolt against the workpiece to prevent spinning during nut tightening
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc-plated finish offers basic corrosion resistance for indoor and sheltered applications
• 1/2-13 UNC thread is a widely used coarse-thread standard for broad hardware compatibility
• 6-inch length under head suits deeper stack-up assemblies and thick structural members

Compatibility

Designed as a standard inch-measurement carriage bolt for general structural and mechanical fastening applications requiring a 1/2-13 UNC thread and 6-inch length under head. Minimum order quantity is 25 pieces.

Installation Notes

Installation is typically performed with a standard wrench or socket on the nut side; no tool is applied to the head. The square neck must be fully seated into the mating material to prevent rotation before torquing the nut. For structural connections governed by building codes, verify that Grade 2 steel meets the load requirements of the applicable standard. Inspect the zinc plating for damage before use in moisture-prone environments, as exposed steel is susceptible to corrosion.