Value Collection 581448PR Hex Socket Cap Screw 5/16-24 Unf

Product Description

The VALUE COLLECTION 581448PR is a hex socket cap screw designed for high-strength bolted connections in mechanical assemblies. It features a 5/16-24 UNF thread with a 3-inch length under head and is driven by a 1/4-inch hex (Allen) key. The fastener is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and a clean, low-reflectance appearance. Threading is partial, making it suitable for applications requiring an unthreaded shank section for shear loading or precise alignment. This screw conforms to ASME/ANSI B18.3 and ASTM A574 standards, which specify dimensional and mechanical property requirements for socket cap screws used in demanding service conditions.

This screw is used across a wide range of industrial, mechanical, and maintenance applications including machine tool assemblies, pump and motor mounting, structural brackets, and equipment panels. Its fine UNF thread pitch provides stronger thread engagement in thinner materials and improved resistance to loosening under vibration compared to coarse-thread (UNC) alternatives. It is well suited for use in both OEM manufacturing and field service work where torque retention and a low-profile socket head are required.

Key Features

• 5/16-24 UNF fine thread for higher thread engagement and vibration resistance
• 3-inch length under head accommodates deep-reach bolting applications
• 1/4-inch hex drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and reduced surface reflectance
• Partial threading allows for shear-load and alignment applications
• Conforms to ASME/ANSI B18.3 dimensional standard

Compatibility

Designed as a standard ASME/ANSI B18.3 socket cap screw for use in any application requiring a 5/16-24 UNF partially threaded fastener with a hex socket drive.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using a calibrated 1/4-inch hex key or bit driver. Always de-energize and lock out equipment before installing or removing fasteners in powered assemblies. Do not substitute a coarse-thread (UNC) fastener in a fine-thread tapped hole. Thread engagement depth and torque requirements should be confirmed against the equipment manufacturer's specifications for the application.