Value Collection 581788BR Hex Socket Cap Screw 7/8-14 Unf

Product Description

The VALUE COLLECTION 581788BR is a partially threaded hex socket cap screw engineered for high-strength fastening applications in mechanical assemblies, fixtures, and industrial equipment. It features a 7/8-14 UNF thread size and measures 3.5 inches in length under the head. The 3/4-inch hex drive accepts a standard Allen or hex key for installation and removal. Constructed from alloy steel with a black oxide finish, this cap screw delivers solid corrosion resistance and maintains structural integrity under load. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it a reliable choice for precision fastening work where thread fit and material grade matter.

This cap screw is suited for use in machinery maintenance, tool and die work, hydraulic component assembly, and general industrial fabrication. The fine 7/8-14 UNF thread pitch provides finer thread engagement than coarse-thread equivalents, which is advantageous in applications requiring precise clamping force or where vibration resistance is needed. The partial threading allows for smooth shank engagement through clearance holes before thread contact begins. Machinists, millwrights, maintenance technicians, and industrial mechanics regularly use fasteners of this type across a wide range of equipment repair and assembly tasks.

Key Features

• 7/8-14 UNF fine thread for precise engagement and vibration resistance
• 3.5-inch length under head with partial threading for clearance-hole applications
• 3/4-inch hex socket drive compatible with standard Allen keys and hex drivers
• Alloy steel construction meets ASTM A574 for high tensile strength
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as an OEM-style or replacement fastener for mechanical assemblies requiring a 7/8-14 UNF partially threaded hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 3/4-inch hex key or Allen driver. Always de-energize and lock out equipment before fastener removal or installation in live machinery. Verify thread condition in the mating hole before installation and use appropriate thread lubricant or anti-seize compound as required by the application. Torque to the value specified in the equipment service documentation for this thread size and grade.