Value Collection 581402PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581402PR is a hex socket cap screw designed for precision fastening applications requiring a compact, recessed drive. Threaded 1/4-28 UNF with a 2.5-inch length under head, this fastener is partially threaded and driven by a 3/16-inch hex key. It is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and a low-reflectance appearance. Conforming to ASME/ANSI B18.3 and ASTM A574 standards, it meets the mechanical strength requirements common in industrial and mechanical assembly work. Licensed tradespeople, maintenance mechanics, and production assembly technicians are the primary installers.

This screw is suited for use in machine assemblies, jigs, fixtures, and structural mechanical joints where a flush or recessed fastener head is required. The 1/4-28 UNF fine thread pitch provides higher tensile strength and better resistance to vibration loosening compared to coarse thread variants, making it appropriate for precision equipment, hydraulic components, and close-tolerance assemblies. Partial threading engages the shank in clearance holes and clamps mating parts effectively.

Key Features

• 1/4-28 UNF fine thread for high tensile load capacity and vibration resistance
• 2.5-inch length under head accommodates deeper grip lengths in structural joints
• Partially threaded shank provides clamping action across clearance holes
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish reduces surface reflectance and offers mild corrosion protection
• 3/16-inch hex drive compatible with standard Allen keys and hex bit drivers

Compatibility

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

Installation Notes

Installation is performed by mechanics or technicians using a 3/16-inch hex key or socket bit driver. Ensure mating threads are clean and free of debris before driving. Do not exceed the rated torque range for 1/4-28 alloy steel fasteners as specified in applicable engineering standards or equipment service documentation. Black oxide finish provides limited corrosion protection — apply a compatible thread lubricant or sealant if the installation environment requires enhanced resistance.