Value Collection 489054PR Carriage Bolt 5/16-18 3-1/2 in

Product Description

The VALUE COLLECTION 489054PR is a 5/16-18 carriage bolt with a 3-1/2 inch length under head and a square neck drive configuration. It is manufactured from Grade 2 steel and finished with a zinc plating for basic corrosion resistance. Carriage bolts are designed for through-bolt fastening applications where a smooth, round head is required on the finished side. The square neck seats into the material during installation, preventing rotation without requiring tool access to the bolt head. This fastener conforms to ASTM A307 standards and is sized in the inch measurement system.

This carriage bolt is suited for general construction, woodworking, and light structural fastening applications where a flush or low-profile head is needed. Common install scenarios include deck framing, timber connections, equipment mounting, and similar trade and construction tasks. It is used by carpenters, general contractors, and tradespeople working with wood or metal substrates requiring a through-bolt connection with a clean head side.

Key Features

• 5/16-18 UNC thread for broad hardware compatibility
• 3-1/2 inch length under head for deeper through-bolt applications
• Square neck prevents bolt rotation during nut tightening without a wrench on the head
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc plating provides basic protection against moisture and oxidation

Compatibility

Designed as an OEM-style replacement or standard fastener for general construction and woodworking applications requiring a 5/16-18 UNC carriage bolt with a 3-1/2 inch length under head.

Installation Notes

Installation is performed by driving the square neck into a pre-drilled hole sized to the bolt shank, then threading a nut from the opposite side. Power down or de-energize any nearby equipment before installing in electrical enclosures or mechanical panels. Use a wrench or socket on the nut side only — the square neck is designed to resist rotation without tool contact on the head. Follow applicable building codes and structural specifications for fastener spacing and torque requirements.