Value Collection 3GBC906C0308 Carriage Bolt 3/8-16 3-1/2 in

Product Description

The VALUE COLLECTION 3GBC906C0308 is a fully threaded carriage bolt designed for general fastening applications in wood and metal assemblies. It features a 3/8-16 UNC thread size with a 3-1/2 inch length under head and a square neck that locks into material surfaces to prevent rotation during installation. Manufactured from Grade 1006-1050 steel with a galvanized zinc-plated finish, it offers corrosion resistance suitable for both indoor and outdoor use. This bolt conforms to ASME B18.5 standards and is measured using the inch system. Tradespeople and contractors working in structural, mechanical, or general construction applications will find this bolt well-suited to high-volume fastening tasks.

This carriage bolt is commonly used in wood framing, deck construction, equipment mounting, and general structural assembly where a tamper-resistant, self-locking fastener is required. The square neck seats into pre-drilled square or round holes in wood to resist spinning, eliminating the need for a wrench on the bolt head during tightening. It is appropriate for residential and light commercial construction projects and is typically installed by carpenters, general contractors, electricians, and plumbers when anchoring panels, junction boxes, brackets, or structural members.

Key Features

• 3/8-16 UNC fully threaded design for maximum thread engagement along the full shank length
• 3-1/2 inch length under head accommodates thicker material stacks
• Square neck prevents bolt rotation during nut tightening without requiring a tool on the head
• Grade 1006-1050 steel construction provides reliable tensile strength for general-purpose fastening
• Galvanized zinc-plated finish delivers corrosion resistance for exposed or outdoor installations
• Conforms to ASME B18.5 fastener standards for dimensional consistency

Compatibility

Designed as a standard UNC carriage bolt for use with 3/8-16 nuts and washers in general construction, structural, and mechanical fastening applications conforming to ASME B18.5.

Installation Notes

Installation is typically performed by carpenters, contractors, or trade professionals using a standard wrench or socket on the nut side while the square neck seats into the material to prevent bolt rotation. Pre-drill the appropriate hole diameter to allow the square neck to seat flush without splitting the material. Always ensure the mating nut and washer match the 3/8-16 UNC thread specification. Follow applicable building codes and structural requirements for the specific assembly being fastened.