Value Collection 581889BR Hex Socket Cap Screw 1-1/8-12 Unf

Product Description

The VALUE COLLECTION 581889BR is a partially threaded hex socket cap screw designed for high-strength fastening applications in mechanical assembly, tooling, and industrial maintenance. Built from alloy steel with a black oxide finish, this fastener delivers corrosion resistance and a clean, low-reflectance appearance suitable for precision equipment. It measures 4.5 inches in length under the head and uses a 0.875-inch hex drive socket, making it compatible with standard internal hex tooling. Manufactured to ASME/ANSI B18.3 and ASTM A574 standards, it is suited for applications requiring controlled torque and a high tensile strength cap screw profile.

This screw is used in industrial, commercial, and OEM manufacturing environments where threaded fasteners must meet tight dimensional tolerances. The 1-1/8-12 UNF thread is a fine-pitch specification commonly found in precision assemblies, machine frames, hydraulic equipment mounting, and tooling fixtures. Partial threading allows the unthreaded shank to bear shear loads while the threaded portion provides clamping force, a configuration preferred in structural and load-bearing joints.

Key Features

• Alloy steel construction rated to ASTM A574 for high tensile strength performance
• Black oxide coating provides mild corrosion resistance and low-reflectance finish
• Partially threaded shank supports shear load distribution in structural joints
• 1-1/8-12 UNF fine thread pitch for precise engagement and secure clamping
• 7/8-inch hex drive compatible with standard internal hex keys and socket drivers
• Conforms to ASME/ANSI B18.3 dimensional standard for socket cap screws

Compatibility

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

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 7/8-inch hex key or socket driver. Ensure the mating threaded hole is clean and free of debris before installation. Do not over-drive; consult applicable torque specifications for ASTM A574 alloy steel fasteners of this diameter as provided by the equipment manufacturer or a recognized fastener standard. Black oxide finish offers limited corrosion protection and may benefit from supplemental lubrication or anti-seize compound in corrosive environments.