Value Collection 581410PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581410PR is a partially threaded hex socket cap screw designed for high-strength fastening in precision assemblies and structural applications. Manufactured from alloy steel with a black oxide finish, this fastener meets ASME/ANSI B18.3 and ASTM A574 standards, confirming its suitability for demanding mechanical and industrial environments. The 1/4-28 UNF thread form provides fine-pitch engagement for applications where vibration resistance and close-tolerance fit are required. A 3/16-inch hex drive socket is required for installation. The 4-inch length under head accommodates deeper joint stacks or thicker material assemblies where standard-length screws fall short.

This fastener is suited for use in machinery, fixtures, tooling, and fabricated assemblies where fine-thread engagement and a clean, low-profile cap head are specified. The partial threading allows for shank engagement through clearance holes before threading into a tapped receiver, a common configuration in machinery and structural bolting. Typical installers include machinists, millwrights, maintenance technicians, and mechanical contractors working in industrial and commercial environments.

Key Features

• 1/4-28 UNF fine thread for vibration-resistant, close-tolerance fastening
• 4-inch length under head accommodates deep or multi-layer assemblies
• Alloy steel construction meets ASTM A574 for high tensile strength
• Black oxide finish provides mild corrosion resistance and reduced light reflection
• Partially threaded shank for shear-load applications and clearance-hole pass-through
• Meets ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application calling for a 1/4-28 UNF partially threaded fastener with a 4-inch length under head.

Installation Notes

Install using a 3/16-inch hex key or socket drive; verify proper torque using a calibrated torque wrench per the joint design specification. Ensure the receiving thread is clean and free of debris before engagement to avoid galling the alloy steel threads. For assemblies subject to vibration, consider thread-locking compound or a locking insert as specified by the design engineer. Follow applicable fastener installation standards and facility safety procedures when working with high-strength fasteners in load-bearing joints.