Value Collection 581057BR Hex Socket Cap Screw 1-1/8-7 Unc

Product Description

The VALUE COLLECTION 581057BR is a partially threaded hex socket cap screw designed for high-strength bolted assemblies in industrial, mechanical, and structural applications. It features a 1-1/8-7 UNC thread size and a 12-inch length under head, making it suitable for thick-section clamping where full-thread screws would not apply. The 7/8-inch internal hex drive accepts a standard hex key or socket driver. Manufactured from alloy steel with a black oxide finish, this fastener meets ASME/ANSI B18.3 and ASTM A574 standards for socket head cap screws. Machinists, millwrights, and maintenance mechanics are the typical installers.

This screw is used where a recessed drive is required to avoid interference with surrounding components or where a flush or low-profile head profile is needed. The 12-inch under-head length accommodates deep-reach bolting through thick plates, frames, or machinery housings. The partial threading keeps the unthreaded shank engaged in the clearance hole for proper shear load transfer. Common industries include heavy equipment manufacturing, machine building, and general industrial maintenance.

Key Features

• 1-1/8-7 UNC thread size for coarse-thread engagement in standard tapped holes
• 12-inch length under head accommodates thick-section or deep-reach applications
• Partially threaded shank allows proper load distribution between shear and tension zones
• 7/8-inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction meets ASTM A574 high-strength socket screw specification
• Black oxide finish provides mild corrosion resistance and reduces light reflection in service

Compatibility

Designed as an OEM-style and general-use replacement fastener for applications requiring a 1-1/8-7 UNC hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574 standards.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance mechanics. Disengage and lock out all energy sources before servicing any assembly that uses this fastener. Use a correctly sized 7/8-inch hex key or socket to avoid rounding the drive recess. Always verify that the mating tapped hole is clean, undamaged, and to UNC specification before installation.