Value Collection 34581 Carriage Bolt 1/4-20 3 in Zinc Grade 2

Product Description

The VALUE COLLECTION 34581 is a 1/4-20 carriage bolt designed for general-purpose fastening applications where a smooth, round head and anti-rotation square neck are required. The square neck seats into the work material to prevent turning during nut tightening, eliminating the need for a secondary tool to hold the bolt head. Manufactured from Grade 2 steel with a zinc-plated finish, this fastener meets ASTM A307 standards. It measures 3 inches under the head and uses Unified National Coarse (UNC) thread. It is well suited for structural assemblies, wood-to-metal connections, and light mechanical work in trade and maintenance settings.

This carriage bolt is used in residential and light commercial construction, general fabrication, and maintenance applications. Typical install scenarios include securing brackets, frames, and panels where a flush, buttonhead profile on the visible face is preferred. The zinc-plated finish provides basic corrosion resistance for indoor and sheltered outdoor environments. Sold as a single bolt with a minimum order quantity of 100 pieces, making it practical for contractors and tradespeople who need consistent fastener stock on hand.

Key Features

• 1/4-20 UNC thread provides broad compatibility with standard hex nuts and threaded hardware
• Square neck locks into substrate to resist rotation during installation without a wrench on the head
• 3-inch length under head suits medium-depth through-bolt applications
• Grade 2 steel construction meets ASTM A307 fastener standard
• Zinc-plated finish adds corrosion resistance for sheltered and indoor environments

Compatibility

Designed as a standard inch-system carriage bolt compatible with 1/4-20 UNC hex nuts, washers, and threaded inserts conforming to ASME and ASTM inch-series fastener standards.

Installation Notes

Installation is performed by tradespeople and maintenance technicians using standard hand tools. Insert the bolt through a pre-drilled hole sized to allow the square neck to seat flush, preventing rotation. Tighten the mating nut from the nut side only — no wrench is needed or recommended on the round head. Follow applicable structural or mechanical codes for torque and fastener spacing requirements relevant to the assembly.