Value Collection 581778BR Hex Socket Cap Screw 7/8-14 Unf

Product Description

The VALUE COLLECTION 581778BR is a hex socket cap screw designed for high-strength fastening applications in mechanical, industrial, and trade assembly work. Sized at 7/8-14 UNF with a 2.25-inch length under head and a 0.75-inch hex drive, this fastener delivers the clamping force and precision thread engagement that demanding installations require. Manufactured from alloy steel with a black oxide finish coating, it resists corrosion and surface wear in service environments where bare steel fasteners would degrade prematurely. Machinists, millwrights, and mechanical contractors install this type of fastener in equipment assembly, structural bracketing, and fixture mounting where socket-drive access is preferred over hex-head tooling.

This screw is suited for applications requiring a fully threaded 7/8-14 UNF fastener with high tensile strength. The fine thread pitch of the UNF series provides greater thread engagement and improved resistance to loosening under vibration compared to coarse thread equivalents, making it a common choice in precision mechanical assemblies, hydraulic equipment, and industrial machinery. The black oxide finish is standard in applications where a low-profile appearance and mild corrosion resistance are needed without the dimensional buildup of plated coatings.

Key Features

• 7/8-14 UNF fully threaded profile for maximum thread engagement along the full shank length
• 2.25-inch length under head suits medium-depth clamping and through-bolt applications
• 0.75-inch hex socket drive allows torquing in recessed or tight-clearance locations
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards for mechanical fasteners
• Black oxide finish provides mild corrosion resistance without significant dimensional change

Compatibility

Designed as a standard ASME/ANSI B18.3 and ASTM A574 compliant hex socket cap screw for use in any application requiring a fully threaded 7/8-14 UNF alloy steel fastener with a 0.75-inch hex drive.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or technician familiar with UNF fastener specifications and torque requirements for the host assembly. Use a calibrated 0.75-inch hex key or socket driver rated for the fastener grade. Ensure mating threads are clean and free of debris before installation. Consult the equipment manufacturer torque specification for the specific assembly; do not estimate torque for structural or pressure-containing joints.