Value Collection 781517PS Carriage Bolt 5/8-11 5 in Square Neck

Product Description

The VALUE COLLECTION 781517PS is a 5/8-11 UNC carriage bolt with a 5-inch length under head and a square neck design. Made from 18-8 stainless steel with a bright uncoated finish, this fastener delivers solid corrosion resistance in wet, outdoor, and marine-adjacent environments. The square neck seats into a pre-drilled square hole to prevent rotation during installation, allowing tightening from the nut side only. It is sized for structural and general mechanical assembly work where a flush, round-head fastener is required and stainless material is specified.

This bolt is suited for use in construction, woodworking, equipment assembly, and utility installations where corrosion resistance and tamper-resistant one-sided tightening are priorities. The 5/8-11 UNC thread is a common coarse-thread size used in heavy-duty fastening applications. The uncoated 18-8 stainless finish makes it compatible with pressure-treated lumber, outdoor structures, and environments where plated carbon steel fasteners would corrode prematurely. Trade contractors, millwrights, and general contractors commonly specify this bolt type for deck framing, signage mounting, and structural panel connections.

Key Features

• 5/8-11 UNC coarse thread for high clamping force in heavy-duty applications
• 5-inch length under head accommodates thick material stacks
• Square neck prevents rotation during installation — no tool access needed at the head
• 18-8 stainless steel construction resists rust and corrosion in exposed environments
• Bright uncoated finish — no plating that can chip, flake, or react with treated lumber

Compatibility

Designed as a standard 5/8-11 UNC carriage bolt for use in applications requiring a square-neck, round-head fastener in inch-measurement sizing. Fits any pre-drilled square-neck clearance hole sized for 5/8-inch carriage bolts.

Installation Notes

Installation requires a pre-drilled hole with a square recess or standard round clearance hole sized for 5/8-inch fasteners. Drive the square neck flush into the substrate to lock against rotation, then apply a hex nut and washer and tighten from the nut side. Use appropriate torque wrenches and avoid over-tightening into soft materials such as wood to prevent pull-through. Follow applicable structural or mechanical codes for fastener spacing and load requirements.