Value Collection 201143PR Button Socket Cap Screw 5/16-24

Product Description

The VALUE COLLECTION 201143PR is a button socket cap screw designed for applications requiring a low-profile fastener with high tensile strength. Manufactured from alloy steel with a black oxide coating, this screw features a 5/16-24 UNF thread and measures 3/8 inches under the head. The button head profile reduces the overall installed height compared to a standard socket cap head. Drive engagement is provided by a 3/16 hex socket. This fastener meets ANSI/ASME B18.3 and ASTM F835 standards and carries a hardness rating of 36 to 43 HRC. It is a fully threaded, right-hand thread fastener suited for precision mechanical assemblies in industrial and manufacturing environments.

This screw is appropriate for use in machine tool fixtures, equipment enclosures, jigs, and mechanical assemblies where a flush or near-flush fastener head is required. The fine 24-thread-per-inch UNF pitch provides strong thread engagement and resistance to vibration loosening, making it well suited for metal-to-metal connections in tight tolerances. The black oxide finish offers mild corrosion resistance and a low-reflectance surface. This fastener is typically installed by machinists, millwrights, and maintenance mechanics working in manufacturing and industrial settings.

Key Features

• Button head profile provides a low-profile, rounded appearance with reduced installed height
• 5/16-24 UNF fully threaded for maximum thread engagement in short-grip applications
• 3/16 hex socket drive for use with standard hex keys and ball-end drivers
• Alloy steel construction with 36 to 43 HRC hardness for high-strength fastening
• Black oxide coating for mild corrosion resistance and reduced surface reflectance
• Meets ANSI/ASME B18.3 and ASTM F835 dimensional and mechanical standards

Compatibility

Designed as an OEM-style or replacement fastener for mechanical assemblies requiring a 5/16-24 UNF button socket cap screw per ANSI/ASME B18.3 and ASTM F835 specifications.

Installation Notes

Install using a 3/16 inch hex key or ball-end driver; ensure the socket is fully seated before applying torque to avoid rounding the drive. Thread fit class 3A indicates a standard close-tolerance fit — verify the mating tapped hole is compatible before installation. Black oxide screws are not rated for outdoor or high-humidity environments without additional lubrication or sealant. This fastener carries a minimum order quantity of 100 pieces; confirm quantity requirements before ordering.