Holo-krome 60060 Flat Socket Cap Screw 1/4-20 X 5/8 in

Product Description

The HOLO-KROME 60060 is a flat socket cap screw designed for flush or countersunk fastening applications in mechanical assemblies, fixtures, and precision equipment. It features an 82-degree flat head with a 5/32-inch hex socket drive and a 1/4-20 UNC fully threaded shank measuring 5/8 inches in overall length. Manufactured from alloy steel with a black oxide finish, it meets ASME B18.3 and ASTM F835 standards and carries a hardness rating of 39 to 44 HRC. Machinists, millwrights, and maintenance technicians working in industrial and commercial settings regularly specify this fastener where a low-profile head is required.

This flat socket cap screw is suited for metal fabrication, machine building, tooling plates, and equipment maintenance where a countersunk profile keeps the fastener surface flush with or below the mating material. The 1/4-20 thread size and fully threaded shank make it compatible with a wide range of standard tapped holes in steel, aluminum, and similar structural materials. The black oxide finish provides moderate corrosion resistance and reduces light reflection, which is useful in precision or optical setups. Thread Fit Class 3A ensures close tolerances and reliable thread engagement in production applications.

Key Features

• 82-degree flat head profile for flush or countersunk installations
• 5/32-inch hex socket drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction with 39 to 44 HRC hardness for high-strength applications
• Black oxide finish for moderate corrosion resistance and low-glare surface
• Fully threaded 1/4-20 UNC shank with Thread Fit Class 3A tolerances
• Meets ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard-inch replacement flat socket cap screw for 1/4-20 UNC tapped holes requiring an 82-degree countersunk head per ASME B18.3 and ASTM F835.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 5/32-inch hex key or Allen driver. Ensure the mating countersink is machined to 82 degrees for proper head seating before installation. De-energize, depressurize, or otherwise isolate the equipment before fastener replacement or removal. Do not exceed the torque capacity of the fastener by using extensions or cheater bars on the hex driver.