Value Collection 581398P Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581398P is a hex socket cap screw designed for precision fastening applications where a flush, low-profile head and controlled torque are required. Sized at 1/4-28 UNF with a 1-1/8 inch length under head, this screw is fully threaded and driven by a 3/16 inch hex key. Manufactured from alloy steel with a black oxide finish, it meets the mechanical strength requirements of ASTM A574 and the dimensional standards of ASME/ANSI B18.3. The black oxide coating provides mild corrosion resistance and reduces light reflection in finished assemblies. Installers in HVAC, plumbing, electrical, and general mechanical trades will find this fastener suitable for equipment panels, brackets, and component mounting.

This screw is suited for applications requiring fine-thread engagement in metal assemblies, machinery frames, jigs, and fixtures. The 1/4-28 UNF thread pitch provides higher thread engagement per inch compared to coarse thread, making it appropriate for thinner material sections or where vibration resistance is needed. It is sold in minimum order quantities of 100 pieces, making it practical for stocking in shop or service van inventory.

Key Features

• 1/4-28 UNF fine thread for increased holding strength in metal
• Fully threaded shank along the 1-1/8 inch length under head
• 3/16 inch hex socket drive for use with standard hex keys or Allen drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish reduces corrosion and minimizes surface glare
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 inch-series hex socket cap screw suitable for use in any application requiring a 1/4-28 UNF fully threaded fastener with a socket cap head profile.

Installation Notes

Install using a 3/16 inch hex key or Allen driver; ensure threads and mating holes are free of debris before driving. De-energize and lock out any equipment before accessing fastened components on electrical or mechanical assemblies. Follow applicable torque guidelines for 1/4-28 alloy steel fasteners per the governing mechanical code or equipment service manual. Avoid over-torquing, which can strip fine threads in softer base materials.