Value Collection 402066PR Hex Head Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 402066PR is a partially threaded hex head cap screw designed for general fastening applications across maintenance, fabrication, and mechanical assembly work. It measures 5/16-18 UNC thread with a 2-1/2 inch length under the head. Manufactured from Grade 2 steel with a bright uncoated finish, this fastener is suited for low- to medium-strength clamping applications where corrosion resistance is not a primary requirement. Installation is performed with a standard hex wrench or socket. This screw follows inch-system dimensions and UNC thread standards, making it straightforward to source and replace in the field.

This cap screw is used in a wide range of light-duty to moderate-duty assemblies including equipment panels, brackets, mechanical housings, and structural supports in HVAC, plumbing, electrical, and general trade environments. The partially threaded shank provides a smooth bearing surface on the unthreaded portion, which is useful when clamping two members together without thread engagement through the full grip length. It is appropriate for indoor or dry-environment applications given the uncoated steel finish.

Key Features

• 5/16-18 UNC thread for compatibility with standard inch-series tapped holes and nuts
• 2-1/2 inch length under head with partial threading for controlled clamping grip
• Grade 2 steel construction provides adequate strength for general-purpose fastening
• Bright uncoated finish — suitable for dry or protected indoor environments
• Hex drive head accepts standard sockets and wrenches for fast installation

Compatibility

Designed as a standard inch-series UNC hex head cap screw for use in any application requiring a 5/16-18 threaded fastener with a 2-1/2 inch grip length.

Installation Notes

Install using a properly sized socket or open-end wrench rated for the fastener drive size. Ensure the mating tapped hole or nut matches the 5/16-18 UNC thread specification before installation. Do not exceed the torque rating appropriate for Grade 2 steel at this thread size, and avoid using impact tools at full power to prevent thread damage. Because this fastener is uncoated steel, apply anti-seize or thread lubricant as needed based on environmental conditions.