Value Collection D30165-51/2 Hex Cap Screw 7/8-9 X 5.5 in

Product Description

The VALUE COLLECTION D30165-51/2 is a partially threaded hex head cap screw designed for general industrial and mechanical fastening applications. It features a 7/8-9 UNC thread and a 5.5-inch length under the head, providing substantial grip depth for heavy-duty joint assemblies. Manufactured from Grade 5 steel with a zinc-plated finish, this fastener delivers reliable tensile strength and basic corrosion resistance suitable for indoor and sheltered outdoor installations. It conforms to ASME B18.2.1 dimensional standards. Tradespeople and maintenance technicians working on structural assemblies, equipment mounting, and mechanical framing will find this a straightforward drop-in fastener for standard UNC applications.

This cap screw is appropriate for use in residential and commercial mechanical installations, equipment fabrication, structural steel connections, and general maintenance work where a partially threaded 7/8-9 UNC fastener is specified. The partial threading concentrates clamping force at the joint interface, making it well suited for bolted connections that require an unthreaded shank section for shear loading or precise spacing. It is commonly installed by HVAC technicians, millwrights, pipefitters, and general maintenance mechanics when assembling or securing mechanical equipment.

Key Features

• 7/8-9 UNC thread form for compatibility with standard unified coarse-thread nuts and tapped holes
• 5.5-inch length under head provides extended grip for thick material stacks
• Partial threading allows unthreaded shank section for shear-load applications
• Grade 5 steel construction meets medium-strength fastener requirements
• Zinc-plated finish provides basic corrosion resistance for general service environments
• Conforms to ASME B18.2.1 dimensional standards for consistent fitment

Compatibility

Designed as a standard replacement or stock fastener for any application requiring a 7/8-9 UNC partially threaded hex head cap screw meeting ASME B18.2.1 specifications.

Installation Notes

Installation should be performed by a qualified tradesperson familiar with fastener torque requirements for Grade 5 hardware. Always ensure mating threads are clean and free of debris before assembly. Use an appropriate torque wrench and consult published torque tables for 7/8-9 Grade 5 fasteners to achieve proper clamp load without overstressing the joint. De-energize or shut down any equipment before accessing fastener locations on live mechanical systems.