Value Collection 581919BR Hex Socket Cap Screw 1-1/4-12 Unf

Product Description

The VALUE COLLECTION 581919BR is a partially threaded hex socket cap screw engineered for high-strength fastening applications. It features a 1-1/4-12 UNF thread size and measures 4.5 inches in length under the head. The screw is machined from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces light reflection. Drive size is 7/8 inch hex (Allen). This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for structural and mechanical assemblies where precise thread engagement and tensile strength are required. Installed by machinists, millwrights, and maintenance technicians.

This cap screw is suited for use in heavy machinery, industrial equipment, and precision mechanical assemblies requiring a fine unified thread pitch. The 1-1/4-12 UNF specification provides tighter thread engagement compared to coarse-pitch alternatives, making it well suited for applications subject to vibration or where controlled preload is critical. The partial threading allows the unthreaded shank to bear shear loads in clearance-hole applications.

Key Features

• 1-1/4-12 UNF partially threaded for precise thread engagement and shear load capacity
• 4.5 inches length under head for deep fastening in thick material stacks
• 7/8 inch hex socket drive for use with standard Allen wrenches or hex socket tooling
• Alloy steel construction for high tensile strength per ASTM A574
• Black oxide finish provides light corrosion protection and low reflectivity
• Meets ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 1-1/4-12 UNF partially threaded fastener with a 7/8 inch hex drive.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians using a properly sized 7/8 inch hex key or socket driver. Ensure mating threads are clean and free of debris before installation. Apply thread lubricant or anti-seize compound as required by the equipment manufacturer to achieve accurate torque-to-preload results. Do not use impact drivers on fine-thread socket cap screws unless specified by the application.