Holo-krome 65028 Button Socket Cap Screw 5/16-24

Product Description

The HOLO-KROME 65028 is a button head socket cap screw designed for applications where a low-profile fastener with high clamping strength is required. It features a 5/16-24 unified fine thread (UNF) with a 3A thread fit class and is driven by a 3/16 inch hex socket. Manufactured from alloy steel with a black oxide finish, this screw delivers hardness rated at 38 HRC, making it suitable for demanding mechanical assemblies. The button head profile reduces snag points in tight clearance installations. Licensed HVAC, plumbing, and mechanical contractors rely on fasteners like this for equipment panel assembly, bracket mounting, and structural component attachment.

This screw is suited for general industrial and mechanical assembly work where a fully threaded, fine-pitch alloy steel fastener is specified. The black oxide finish provides moderate corrosion resistance and reduces light reflection in service environments. Common applications include machine frames, motor mounts, access panels, and equipment enclosures across HVAC, refrigeration, and light industrial equipment. The fine thread pitch offers improved torque-to-tension performance compared to coarse thread equivalents.

Key Features

• Button head profile provides low-profile, snag-resistant installation in tight clearance areas
• 5/16-24 UNF thread with 3A fit class for precise engagement and secure clamping
• Alloy steel construction with 38 HRC hardness for high-strength fastening
• Black oxide finish for moderate corrosion resistance and reduced reflectivity
• Fully threaded shank maximizes thread engagement across the full grip length
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a direct-fit alloy steel button socket cap screw for mechanical assemblies requiring a 5/16-24 UNF fine-thread fastener conforming to ANSI/ASME B18.3 and ASTM F835 standards.

Installation Notes

Installation requires a 3/16 inch hex socket driver or Allen key; ensure the driver is fully seated before applying torque to avoid rounding the socket. Power down or de-energize any equipment before fastener removal or replacement on live assemblies. Follow applicable ANSI and equipment manufacturer specifications for fastener torque requirements. Inspect threads and mating tapped holes for damage or contamination before installation.