Value Collection 581458PS Hex Socket Cap Screw 5/16-24 Unf

Product Description

The VALUE COLLECTION 581458PS is a partially threaded hex socket cap screw designed for high-strength fastening applications across industrial, mechanical, and structural assemblies. Sized at 5/16-24 UNF with a 5-1/2 inch length under head, this fastener is machined from alloy steel and finished with a black oxide coating for corrosion resistance and reduced surface reflectivity. It accepts a 1/4 inch hex drive and meets ASME/ANSI B18.3 and ASTM A574 standards, making it a code-compliant choice for demanding service environments. Machinists, millwrights, and maintenance technicians regularly specify this screw type for precision-fit bolted joints.

This socket cap screw is suited for use wherever a countersunk or low-profile high-strength fastener is required. Common applications include machine tool assemblies, jigs and fixtures, hydraulic components, and general industrial fabrication. The fine 24 TPI UNF thread pitch provides greater thread engagement and torque retention compared to coarse-thread equivalents, making it a preferred choice in vibration-prone or load-critical installations. The partial threading allows the unthreaded shank to serve as a precision locating surface in close-tolerance bores.

Key Features

• 5/16-24 UNF fine thread for superior thread engagement and clamping load
• 5-1/2 inch length under head accommodates deep-reach fastening applications
• Partially threaded shank doubles as a precision locating surface in bored holes
• Alloy steel construction delivers high tensile strength per ASTM A574 requirements
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Meets ASME/ANSI B18.3 dimensional standards for socket cap screws

Compatibility

Designed as an OEM-style replacement or standard service fastener for applications requiring a 5/16-24 UNF partially threaded hex socket cap screw with a 5-1/2 inch length under head.

Installation Notes

Install using a calibrated 1/4 inch hex key or hex bit driver. Power down and de-energize any associated equipment before servicing fastened assemblies. Do not exceed recommended seating torque for the fastener grade; consult relevant ASME or equipment OEM torque specifications for the joint material and thread class. Inspect threads and mating surfaces for damage or contamination before installation.