Value Collection 581055BR Hex Socket Cap Screw 1-1/8-7 Unc

Product Description

The VALUE COLLECTION 581055BR is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. It features a 1-1/8-7 UNC thread size and an 11-inch length under the head, making it suitable for deep-reach clamping and bolted joint applications. The alloy steel construction is finished with a black oxide coating that provides a degree of corrosion resistance and reduces light reflection in service environments. A 7/8-inch hex drive socket is required for installation. Licensed mechanics, millwrights, and industrial maintenance technicians typically install fasteners of this type.

This screw is well suited for structural, machine, and tooling assemblies that demand a large-diameter, partially threaded socket cap screw. The coarse 7 UNC thread pitch provides strong clamping force and is easier to start in tapped holes compared to fine-thread variants. The black oxide finish makes this fastener a common choice in manufacturing fixtures, heavy equipment, and general industrial machinery where appearance and moderate corrosion protection are both factors.

Key Features

• 1-1/8-7 UNC coarse thread for strong engagement and easy installation in tapped alloy steel holes
• 11-inch length under head accommodates deep clamping and long-reach fastening applications
• Partially threaded shank provides a bearing surface for precise joint alignment
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards for socket cap screws
• Black oxide coating offers mild corrosion resistance and a low-reflectance finish
• 7/8-inch hex drive socket interface for high-torque installation with standard drive tools

Compatibility

Designed as a standard ASME/ANSI B18.3 and ASTM A574 socket cap screw for use in any application requiring a 1-1/8-7 UNC partially threaded fastener with an 11-inch grip length.

Installation Notes

Installation should be performed by a qualified mechanic or millwright using a 7/8-inch hex drive socket and an appropriate torque wrench. Ensure the mating tapped hole is clean, properly formed to 1-1/8-7 UNC specification, and free of debris before threading the screw. De-energize and lock out any machinery before servicing fasteners on live equipment in accordance with applicable OSHA lockout/tagout procedures. Do not substitute this screw for a different thread class or grade without verifying joint design requirements.