Value Collection 581887BR Hex Socket Cap Screw 1-1/8-12 Unf

Product Description

The VALUE COLLECTION 581887BR is a hex socket cap screw designed for high-strength fastening applications in mechanical assembly, maintenance, and industrial fabrication. It features a 1-1/8-12 UNF thread size with a 3.5-inch length under head and is fully threaded along its entire shank. Driven by a 7/8-inch hex socket, the fastener is manufactured from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces light reflection. This screw meets ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for precision and load-bearing installations where dimensional accuracy and material strength are required.

This fastener is suited for industrial equipment assembly, machine component mounting, tooling fixtures, and structural mechanical connections where a UNF fine-thread profile is specified. The fine-thread 1-1/8-12 UNF pitch offers stronger thread engagement and better resistance to vibration-induced loosening compared to coarse-thread equivalents. It is commonly installed by machinists, millwrights, maintenance technicians, and mechanical contractors working on production machinery, heavy equipment, or fabricated steel assemblies.

Key Features

• 1-1/8-12 UNF fine-thread for precise torque control and vibration resistance
• 3.5-inch length under head with full threading along the entire shank
• 7/8-inch hex socket drive for high-torque installation with standard tooling
• Alloy steel construction meets ASTM A574 for tensile and yield strength requirements
• Black oxide finish provides mild corrosion resistance and a low-reflectance surface
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for mechanical assemblies specifying a 1-1/8-12 UNF hex socket cap screw per ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation is performed by machinists or mechanical technicians using a 7/8-inch hex key or socket driver. De-energize and lock out all equipment before fastener installation or removal per applicable OSHA lockout/tagout procedures. Verify that mating thread taps and bores are clean and free of debris before driving the fastener. Do not substitute a coarse-thread driver or impact tool setting that exceeds the rated torque for the thread class and material.