Value Collection 581450PR Hex Socket Cap Screw 5/16-24 Unf

Product Description

The VALUE COLLECTION 581450PR is a partially threaded hex socket cap screw designed for high-strength fastening applications across mechanical, structural, and industrial assemblies. It features a 5/16-24 UNF thread size with a 3-1/2 inch length under the head and is driven by a 1/4 inch hex key. Constructed from alloy steel with a black oxide finish, this cap screw delivers the tensile strength and corrosion resistance required in demanding service environments. It meets ASME/ANSI B18.3 and ASTM A574 standards, confirming its suitability for load-bearing fastener applications. Machinists, millwrights, and maintenance technicians commonly specify this type of fastener for equipment assembly and repair work.

This cap screw is suited for use in general industrial machinery, HVAC equipment frames, pump and motor mounts, and other mechanical assemblies requiring a fine-thread socket head fastener. The 5/16-24 UNF fine thread pitch provides higher thread engagement and improved resistance to vibration loosening compared to coarse-thread equivalents, making it a preferred choice in applications subject to dynamic loading. The partial threading allows the unthreaded shank to bear shear loads, which is useful in precision-fit applications and close-tolerance bores.

Key Features

• 5/16-24 UNF fine thread for high thread engagement and vibration resistance
• 3-1/2 inch length under head with partial threading for shear load capacity
• 1/4 inch hex drive for use with standard Allen keys and hex bit drivers
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduced light reflection
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for any application requiring a 5/16-24 UNF partially threaded fastener with a 1/4 inch hex drive.

Installation Notes

Installation is performed using a 1/4 inch hex key or socket hex bit driver. Ensure mating threaded holes are clean, free of debris, and properly tapped to 5/16-24 UNF specification before installation. Apply thread lubricant or thread-locking compound as required by the assembly specification. Power down and de-energize any equipment before accessing fastener locations on live machinery.