Value Collection 581093PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 581093PR is a hex socket cap screw designed for precision fastening in mechanical assemblies, machine components, and light structural applications. It features a 4-40 UNC thread and measures 1-1/8 inches under the head. The 3/32-inch hex drive accepts a standard hex key or Allen wrench. Constructed from alloy steel with a black oxide finish, this screw offers solid strength and mild corrosion resistance for indoor and enclosed environments. It is partially threaded and conforms to ASME/ANSI B18.3 and ASTM A574 standards. Machinists, maintenance technicians, and assembly professionals are the typical installers.

This screw is suited for use in machine tool assemblies, jigs and fixtures, electronic enclosures, and equipment panels where a recessed drive profile is required to keep fastener heads flush or below the surface. The 4-40 UNC thread is a fine-pitch coarse-class unified thread commonly found in small mechanical and electronic hardware. The black oxide coating blends into dark-finished assemblies and provides a low-profile appearance. This item is sold in single-piece packages with a minimum order quantity of 100 pieces.

Key Features

• 4-40 UNC thread for use in standard unified coarse-thread tapped holes
• 1-1/8 inches length under head for moderate grip range in thin to medium material stacks
• 3/32-inch hex socket drive accepts standard hex keys for controlled torque application
• Partially threaded shank provides a smooth shoulder section above the thread
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish reduces light reflection and offers light surface protection

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw compatible with any 4-40 UNC tapped hole requiring a 3/32-inch hex drive fastener in alloy steel with black oxide finish.

Installation Notes

Install using a 3/32-inch hex key or L-wrench; ensure the mating tapped hole is clean and free of debris before threading. Confirm thread engagement depth is appropriate for the material being fastened to avoid stripping the 4-40 thread. Do not apply anti-seize compounds unless specified by the equipment manufacturer, as black oxide surfaces interact differently than bare metal. This fastener should be installed by qualified machinists or technicians following applicable equipment service procedures.