Value Collection 581144PR Hex Socket Cap Screw 4-48 Unf

Product Description

The VALUE COLLECTION 581144PR is a hex socket cap screw designed for precision fastening in tight-clearance applications. It features a 4-48 UNF thread, a 5/16 inch length under head, and a 3/32 inch hex drive. The fastener is fully threaded and manufactured from alloy steel with a black oxide finish for corrosion resistance. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for structural and mechanical assemblies where reliable clamp load and dimensional consistency are required. Machinists, millwrights, and maintenance technicians install this type of fastener in precision instrument assemblies, electronic enclosures, and light mechanical subassemblies.

This screw is suited for applications requiring a fine-thread socket cap fastener in compact or low-profile assemblies. The 4-48 UNF thread pitch provides higher thread engagement and vibration resistance compared to coarse-thread equivalents of the same diameter. The black oxide finish helps reduce light reflection and provides mild surface protection in dry indoor environments. Typical applications include instrument panels, jig and fixture work, small motor assemblies, and similar precision mechanical work where a hex socket drive allows access in confined spaces.

Key Features

• 4-48 UNF thread for fine-pitch engagement and improved vibration resistance
• 3/32 inch hex socket drive for use with standard Allen keys in tight spaces
• Fully threaded along the 5/16 inch length under head for maximum thread engagement
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish reduces reflection and provides mild corrosion protection
• 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 application requiring a 4-48 UNF fine-thread fastener with a 3/32 inch hex drive.

Installation Notes

Install using a calibrated 3/32 inch hex key or Allen driver. Ensure mating tapped holes are cut to 4-48 UNF specification before installation. Power down or de-energize any equipment before fastening work on electrical or mechanical assemblies. Do not exceed the rated drive engagement depth, and avoid cam-out by using a properly sized driver that fully seats in the socket.