Value Collection 581917BR Hex Socket Cap Screw 1-1/4-12 Unf

Product Description

The VALUE COLLECTION 581917BR is a partially threaded hex socket cap screw designed for high-load fastening applications in industrial, mechanical, and structural assemblies. Sized at 1-1/4-12 UNF with a 4-inch length under head, this fastener is driven with a 7/8-inch hex socket. The alloy steel construction provides high tensile strength, and the black oxide finish offers baseline corrosion resistance and reduced light reflection. This screw meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for applications where dimensional and mechanical property compliance is required.

This cap screw is used in heavy-duty mechanical assemblies, machine tool mounting, hydraulic component attachment, and structural fastening where fine-thread engagement and high clamping force are needed. The 1-1/4-12 UNF thread pitch provides finer thread engagement than coarse-thread equivalents, making it well suited for applications with vibration or where precise torque retention matters. It is typically installed by machinists, maintenance technicians, and industrial assembly professionals.

Key Features

• 1-1/4-12 UNF thread size for fine-thread engagement and superior clamping retention
• 4-inch length under head accommodates deeper fastening in thick workpieces
• Partially threaded shank allows shear-load bearing through the unthreaded grip section
• 7/8-inch hex socket drive for use with standard socket tooling
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and a low-reflectance surface

Compatibility

Designed as a standard ASME/ANSI B18.3-compliant hex socket cap screw for industrial and mechanical fastening applications requiring a 1-1/4-12 UNF partially threaded fastener.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 7/8-inch hex key or socket drive. Always ensure the mating threaded hole is clean, properly tapped to UNF specifications, and free of debris before driving. Do not exceed the rated torque capacity of the fastener based on the ASTM A574 grade requirements. Apply thread lubricant or anti-seize as appropriate for the application environment to prevent galling on assembly.