Value Collection 581816BR Hex Socket Cap Screw 1-8 Unc

Product Description

The VALUE COLLECTION 581816BR is a hex socket cap screw designed for high-strength fastening applications in industrial, structural, and mechanical assemblies. This screw features a 1-8 UNC thread size with a 9.5-inch length under the head and a 3/4-inch hex drive for use with a standard hex key or Allen wrench. Constructed from alloy steel with a black oxide coating, it delivers solid corrosion resistance and durability under load. The partial threading configuration allows for clamping force on non-threaded sections, making it well suited for heavy-duty bolted joints where thread engagement at the mating surface is required.

This cap screw is used in manufacturing, maintenance, and industrial fabrication environments where large-diameter, long-reach fasteners are needed. Typical applications include machine frames, structural steel assemblies, heavy equipment, and tooling fixtures. The black oxide finish provides mild corrosion protection and reduces light glare in precision environments. Installation is performed by machinists, millwrights, and maintenance technicians using a 3/4-inch hex key or socket driver.

Key Features

• 1-8 UNC thread size for large-diameter fastening
• 9.5-inch length under head for deep-reach or thick-stack applications
• Alloy steel construction for high tensile and shear strength
• Black oxide coating for mild corrosion resistance and surface hardness retention
• Partially threaded shank provides clamping grip on unthreaded section
• Meets ASME/ANSI B18.3 and ASTM A574 fastener standards

Compatibility

Designed as a standard ASME/ANSI B18.3 and ASTM A574 compliant hex socket cap screw suitable for 1-8 UNC threaded holes in industrial and mechanical assemblies requiring a partially threaded, large-diameter fastener.

Installation Notes

Installation is performed by qualified machinists or maintenance personnel using a 3/4-inch hex key or appropriate drive tool. Ensure the mating threaded hole is clean and correctly tapped to 1-8 UNC specification before installation. Power down and de-energize any equipment before servicing fastened assemblies. Do not use impact drivers at full torque without verifying joint specifications with engineering documentation.