Value Collection 781240PR Carriage Bolt 5/16-18 3.5in Ss

Product Description

The VALUE COLLECTION 781240PR is a 5/16-18 carriage bolt with a 3-1/2 inch length under head and a square neck drive style. Made from 18-8 stainless steel with a bright uncoated finish, this fastener resists corrosion in wet and outdoor environments. The square neck seats into the material being fastened to prevent rotation during tightening, eliminating the need for a backup wrench on the bolt head. The UNC thread form provides reliable clamping force across a wide range of structural and mechanical assembly applications. Installers in construction, maintenance, and fabrication trades use this type of fastener regularly for wood-to-wood and wood-to-metal connections.

This carriage bolt is suited for general construction, framing, deck building, equipment mounting, and maintenance repair operations where corrosion resistance is a priority. The 5/16-18 UNC thread size and 3-1/2 inch shank length make it appropriate for connecting medium-thickness lumber or structural members. Applications include outdoor structures, marine-adjacent environments, and any assembly where stainless steel is specified to meet corrosion or contamination requirements.

Key Features

• 18-8 stainless steel construction provides corrosion resistance for outdoor and wet environments
• Square neck design prevents rotation during fastening without requiring a wrench on the head
• 5/16-18 UNC thread standard for broad compatibility with standard nuts and hardware
• 3-1/2 inch length under head accommodates medium-thickness structural members
• Bright uncoated finish maintains dimensional consistency for close-tolerance applications

Compatibility

Designed as a standard 5/16-18 UNC carriage bolt compatible with matching hex nuts, washers, and hardware conforming to inch-series fastener standards.

Installation Notes

Installation is performed by tradespeople, carpenters, and maintenance technicians using standard hand or power tools. Drive the square neck fully into the mating material before applying torque to the nut to prevent bolt spin. Use a properly sized wrench or socket on the nut side only. Follow applicable building codes and structural specifications when using fasteners in load-bearing assemblies.