Value Collection 457594PR Hex Head Cap Screw 7/8-9

Product Description

The VALUE COLLECTION 457594PR is a partially threaded hex head cap screw designed for general industrial and mechanical fastening applications. It features a 7/8-9 UNC thread with a 3-3/4 inch length under head, manufactured from Grade 5 steel with a zinc-plated finish for basic corrosion resistance. With a tensile strength of 120,000 psi, this fastener meets ASME B18.2.1 and SAE J429 standards. It is installed using a 1-5/16 inch hex key or wrench. Machinists, millwrights, maintenance technicians, and field mechanics rely on Grade 5 fasteners for structural and equipment assembly tasks across a wide range of industries.

This cap screw is suited for medium-duty bolted connections in equipment frames, structural steel assemblies, machinery mounts, and fabrication work. The partial thread design provides a smooth shank section, which is preferred in applications requiring precise hole fit, shear load transfer, or clamping without full thread engagement through the grip length. It is appropriate for both shop and field installation in industrial, commercial, and trade service environments.

Key Features

• 7/8-9 UNC thread for broad compatibility with standard inch-series hardware
• 3-3/4 inch length under head with partial threading for shank grip applications
• Grade 5 steel construction with 120,000 psi tensile strength
• Zinc-plated finish provides baseline corrosion and oxidation resistance
• Meets ASME B18.2.1 and SAE J429 dimensional and mechanical standards
• 1-5/16 inch hex drive for use with standard open-end, box, or socket wrenches

Compatibility

Designed as a standard inch-series UNC hex head cap screw compatible with any 7/8-9 threaded hole or nut conforming to ASME B18.2.1 and SAE J429 specifications.

Installation Notes

Installation is performed by qualified mechanics or technicians using a 1-5/16 inch wrench or socket. Ensure mating threads are clean and free of debris before installation. Apply thread lubricant or anti-seize compound as required by the application and torque to values specified by the equipment manufacturer or applicable fastener standards. Do not exceed the rated tensile strength of the fastener during torque application.