Value Collection 581873BR Hex Socket Cap Screw 1-1/8-7 Unc

Product Description

The VALUE COLLECTION 581873BR is a partially threaded hex socket cap screw manufactured from alloy steel with a black oxide coating. It features a 1-1/8-7 UNC thread size and a 5-inch length under head, making it well suited for high-strength fastening applications where a recessed drive is required. The 7/8-inch hex drive socket accepts a standard hex key or Allen wrench. Black oxide finish provides mild corrosion resistance and reduces light reflection in service environments. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, confirming it is manufactured to recognized dimensional and mechanical property specifications for socket cap screws.

This cap screw is used in industrial, mechanical, and structural assemblies where high clamping force and a low-profile head are needed. Typical applications include machinery frames, fixture plates, die sets, and heavy equipment assemblies. The partial threading allows for a smooth shank section that resists shear loads in close-tolerance bored holes. It is commonly installed by machinists, millwrights, and maintenance mechanics working on equipment requiring high-strength threaded fasteners.

Key Features

• 1-1/8-7 UNC thread size for high-load fastening applications
• 5-inch length under head with partial threading to resist shear stress
• 7/8-inch hex drive accepts standard hex keys and power drive sockets
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide coating provides mild corrosion resistance and reduces galling risk
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any tapped hole with a 1-1/8-7 UNC thread form requiring a 5-inch fastener under head length.

Installation Notes

Installation should be performed by a qualified mechanic or millwright using a properly sized 7/8-inch hex key or drive socket. Always ensure the receiving tapped hole is clean, free of debris, and cut to the correct UNC thread specification before installation. Apply appropriate thread lubricant or anti-seize compound where required by the application to achieve accurate torque loading. De-energize and lock out all equipment before fastener installation or removal in powered machinery.