Holo-krome 60002 Flat Socket Cap Screw 4-40 X 1/4 in

Product Description

The HOLO-KROME 60002 is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head with a 1/16 inch hex socket drive and is manufactured from alloy steel with a black oxide finish. The 4-40 UNC thread runs the full length of the 1/4 inch body, conforming to ASME B18.3 and ASTM F835 standards. With a hardness rating of 39-44 HRC, this screw is suited for precision mechanical assemblies, tooling fixtures, and equipment fabrication where a low-profile head and high fastener strength are required. Installation is performed with a standard 1/16 inch hex key.

This screw fits residential and commercial mechanical assemblies where countersunk socket fasteners are called for. Typical applications include precision instrument enclosures, jigs and fixtures, electrical panel hardware, and light mechanical subassemblies. The black oxide finish provides mild corrosion resistance and reduces light reflection, making it a common choice in industrial and electronic equipment environments. The fully threaded 1/4 inch length and 4-40 thread size are standard in small-format machined components.

Key Features

• 82-degree flat head profile seats flush in standard countersunk holes
• 1/16 inch hex socket drive for precise torque application in tight spaces
• Fully threaded 1/4 inch length for maximum thread engagement
• Alloy steel construction with 39-44 HRC hardness for high-strength fastening
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Meets ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-fit fastener for assemblies requiring a 4-40 UNC flat socket cap screw with an 82-degree countersink angle and 1/16 inch hex drive.

Installation Notes

Installation is performed by machinists, mechanical assemblers, or maintenance technicians using a 1/16 inch hex key or hex driver. Ensure the mating countersink is machined to an 82-degree included angle for proper head seating. Thread fit class 3A requires clean, debris-free threads in the mating hole. Follow applicable torque guidelines for 4-40 alloy steel fasteners from the relevant ASME standard for the assembly.