Value Collection 581888BR Hex Socket Cap Screw 1-1/8-12 Unf

Product Description

The VALUE COLLECTION 581888BR is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. The screw features a 1-1/8-12 UNF thread size with a 4-inch length under head and partial threading along the shank. A 7/8-inch hex drive socket is required for installation. Constructed from alloy steel with a black oxide finish, this fastener resists corrosion and withstands the demands of heavy-duty service environments. It conforms to ASME/ANSI B18.3 and ASTM A574 standards. Machinists, maintenance technicians, and industrial assembly professionals are the typical installers.

This socket cap screw is suited for applications requiring a fine-thread fastener with a recessed drive profile. Fine-thread UNF fasteners provide greater resistance to loosening under vibration compared to coarse-thread equivalents, making them a common choice in precision machinery, hydraulic equipment, jigs, fixtures, and structural steel connections where controlled clamping force is critical. The black oxide coating provides mild corrosion protection in controlled environments and reduces galling during assembly.

Key Features

• 1-1/8-12 UNF fine-thread profile for high vibration resistance and precise torque control
• 4-inch length under head with partial threading for shank grip in load-bearing connections
• 7/8-inch hex socket drive for high-torque installation using standard socket tooling
• Alloy steel construction meets ASTM A574 high-strength socket screw requirements
• Black oxide finish reduces surface reflection and provides light corrosion resistance
• Conforms to ASME/ANSI B18.3 dimensional standards for socket cap screws

Compatibility

Designed as a standard-dimension ASME/ANSI B18.3 hex socket cap screw suitable for use in threaded bores or with appropriate nuts in industrial and mechanical assemblies requiring a 1-1/8-12 UNF fine-thread fastener.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians using a calibrated torque wrench with the appropriate 7/8-inch hex socket bit. Ensure mating threads are clean and free of debris before assembly. Apply a thread lubricant or anti-seize compound as required by the application to achieve accurate clamp load. Verify thread engagement depth meets the requirements of the joint design before final torquing.