Value Collection 581886BR Hex Socket Cap Screw 1-1/8-12 Unf

Product Description

The VALUE COLLECTION 581886BR is a hex socket cap screw designed for high-strength fastening applications in mechanical assembly, maintenance, and repair work. It features a 1-1/8-12 UNF thread size with a 3-inch length under head and is fully threaded along its entire shank. The screw is machined from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and a consistent low-reflectance appearance. Drive is a 7/8-inch hex socket. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for load-bearing and torque-critical fastening tasks across industrial and trade environments.

This screw is suited for mechanical, industrial, and facilities maintenance applications where fine-thread UNF engagement is required for vibration resistance or precise clamping force. The 1-1/8-12 UNF specification is common in heavy equipment, hydraulic assemblies, and structural mechanical joints. It is installed by machinists, millwrights, maintenance technicians, and field service professionals working on equipment that demands close-tolerance fasteners. Fully threaded construction maximizes thread engagement across the full clamped length.

Key Features

• 1-1/8-12 UNF thread size for fine-thread vibration resistance and precise load control
• 3-inch length under head, fully threaded for maximum thread engagement
• Alloy steel construction rated to ASTM A574 for high tensile and proof load requirements
• Black oxide finish provides mild corrosion resistance and reduces surface reflectance
• 7/8-inch hex socket drive compatible with standard hex keys and socket drivers
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 1-1/8-12 UNF fully threaded fastener with a 7/8-inch hex drive.

Installation Notes

Installation is performed by qualified mechanical technicians using a calibrated torque wrench and a 7/8-inch hex socket or hex key. De-energize and lock out all equipment before fastener replacement or installation per applicable OSHA lockout/tagout procedures. Inspect mating threaded holes for damage or contamination before installation. Do not exceed the rated proof load for the fastener grade or substitute this screw in applications requiring a coarser UNC thread specification.