Value Collection 581404PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581404PR is a hex socket cap screw designed for precision fastening in applications requiring a fine-thread, high-strength connection. Manufactured from alloy steel with a black oxide finish, this fastener meets ASME/ANSI B18.3 and ASTM A574 standards. It features a 1/4-28 UNF thread size, a 2-3/4-inch length under head, and a 3/16-inch hex drive socket. The partial threading is suited for applications where clamping force must be concentrated at the joint rather than distributed along the shank. Machinists, maintenance technicians, and industrial assembly professionals are the primary installers of this fastener.

This screw is suited for industrial, mechanical, and manufacturing applications where a UNF fine-thread profile is required for vibration resistance or precise torque control. The black oxide coating provides mild corrosion resistance and reduces light reflection, making it appropriate for tooling fixtures, machine assemblies, and equipment fabrication environments where a clean finished appearance is also desired.

Key Features

• 1/4-28 UNF fine thread for improved vibration resistance over coarse-thread equivalents
• 2-3/4-inch length under head with partial threading for controlled joint clamping
• 3/16-inch internal hex drive for high-torque socket wrench engagement
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish per ASME/ANSI B18.3 standard for dimensional and surface compliance

Compatibility

Designed as an OEM-style replacement or standard-specification fastener for mechanical assemblies requiring a 1/4-28 UNF partially threaded hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a 3/16-inch hex key or socket driver. Always ensure the receiving threaded hole is clean and free of debris before installation. Power down or de-energize any equipment before fastening components in electrical or mechanical enclosures. Do not exceed the rated torque range for 1/4-28 alloy steel cap screws as specified by the applicable engineering drawing or equipment service manual.