Value Collection 581059BR Hex Socket Cap Screw 1-1/8-7 Unc

Product Description

The VALUE COLLECTION 581059BR is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Sized at 1-1/8-7 UNC with a 13-inch length under head, this fastener accommodates a 7/8-inch hex drive and is manufactured from alloy steel with a black oxide finish for corrosion resistance. The black oxide coating also reduces light reflection, making it suitable for applications where surface appearance matters alongside performance. Installers working in heavy equipment, tooling fixtures, or machine frames will find this screw a reliable OEM-style replacement or new-build component.

This cap screw is suited for heavy-duty bolted joints in manufacturing, fabrication, and maintenance-repair-overhaul environments. Partial threading is standard for this class of fastener, providing a strong unthreaded shank section that resists shear loads common in structural connections. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for precision-toleranced applications where fastener grade and dimensional conformance are required by specification.

Key Features

• 1-1/8-7 UNC thread size for large-diameter, high-load applications
• 13-inch length under head with partial threading for shear-resistant installation
• 7/8-inch hex socket drive for use with standard hex keys or socket tooling
• Alloy steel construction provides high tensile strength per ASTM A574
• Black oxide finish adds mild corrosion resistance and reduces surface reflectivity
• Meets ASME/ANSI B18.3 dimensional standards for socket cap screws

Compatibility

Designed as an OEM-style replacement or new-installation fastener for heavy-duty mechanical assemblies requiring 1-1/8-7 UNC threaded connections and conformance to ASME/ANSI B18.3 and ASTM A574 standards.

Installation Notes

Installation is typically performed by millwrights, machinists, or maintenance mechanics using a calibrated torque wrench and a 7/8-inch hex key or socket drive. Verify thread engagement depth and hole cleanliness before installation. Always follow the applicable engineering specification or equipment service manual for torque requirements, as values vary by joint material and application. De-energize or lock out equipment before servicing fasteners in powered machinery per applicable OSHA lockout/tagout procedures.