Value Collection 581117PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 581117PR is a 4-40 UNC hex socket cap screw designed for precision fastening in tight clearance applications. It features a 3/32 inch hex drive and measures 5/16 inches under the head, with fully threaded engagement along the entire shaft. Manufactured from alloy steel with a black oxide coating, it delivers solid tensile strength and moderate corrosion resistance in controlled environments. Machinists, assembly technicians, and maintenance professionals use this fastener where a socket-drive cap screw is required at the small 4-40 thread size.

This screw is suited for light-duty mechanical assemblies, instrument enclosures, electronics chassis, and precision equipment requiring a compact, low-profile cap screw. The 4-40 UNC thread is a common standard in instrumentation, HVAC control panels, and small-equipment manufacturing. The black oxide finish is appropriate for indoor or protected environments where mild corrosion resistance meets aesthetic requirements. Full threading provides maximum thread engagement across short fastener lengths.

Key Features

• 4-40 UNC thread for standard small-fastener applications in precision assemblies
• 5/16 inch length under head with fully threaded shank for complete thread engagement
• 3/32 inch hex socket drive for use with Allen or hex key tooling
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide coating provides mild corrosion resistance and reduced light reflection

Compatibility

Designed as an OEM-style replacement or stock fastener for any assembly requiring a 4-40 UNC hex socket cap screw with a 5/16 inch under-head length and 3/32 inch drive.

Installation Notes

Installation is performed using a 3/32 inch hex key or Allen driver. Ensure mating threads are clean and free of debris before driving. Apply appropriate thread-locking compound if vibration resistance is required by the application. Follow torque specifications listed in the relevant ASME or equipment manufacturer guidelines for 4-40 alloy steel fasteners.