Value Collection R63640489 Carriage Bolt 5/16-18 1-1/4 in

Product Description

The VALUE COLLECTION R63640489 is a 5/16-18 carriage bolt with a 1-1/4 inch length under head, manufactured from 18-8 stainless steel with a bright uncoated finish. The square neck design locks the bolt in place against the mating material during installation, eliminating the need to hold the bolt head while tightening the nut. This fastener follows Unified National Coarse (UNC) thread standards and is suited for structural and mechanical assemblies where corrosion resistance is a priority. Plumbers, electricians, HVAC technicians, and general trade professionals use this style of fastener in equipment mounting, panel attachment, and utility installations.

This carriage bolt is appropriate for use in residential and light commercial applications where a flush, rounded head is required on the exposed face of the assembly. The 18-8 stainless steel construction makes it well suited for environments with moisture exposure, including mechanical rooms, outdoor equipment pads, and pool-area installations. It is sold individually with a minimum order quantity of 10 units.

Key Features

• 5/16-18 UNC thread for broad compatibility with standard nuts and hardware
• Square neck prevents rotation during nut tightening without requiring a wrench on the head
• 18-8 stainless steel construction provides corrosion resistance in wet or outdoor environments
• Bright uncoated finish — no risk of coating interference with electrical or grounding contact surfaces
• 1-1/4 inch length under head suits light-duty panel, bracket, and equipment mounting

Compatibility

Designed as a standard UNC 5/16-18 carriage bolt for use with any compatible 5/16-18 hex nut and standard hardware in inch-measurement fastener applications.

Installation Notes

Installation requires only a standard wrench or socket on the mating nut — the square neck seats into the substrate to hold the bolt stationary. Ensure the receiving material has a square hole or sufficient grip to engage the neck properly before torquing the nut. When used in electrical or HVAC equipment applications, follow applicable NEC or equipment manufacturer guidelines for fastener torque and panel integrity. Stainless steel fasteners are susceptible to galling — apply an appropriate anti-seize compound when assembling stainless nut-and-bolt pairs.