Holo-krome 60012 Flat Socket Cap Screw 5-40 X 1/4 in

Product Description

The HOLO-KROME 60012 is a flat socket cap screw designed for applications requiring a low-profile, flush-mounted fastener with high tensile strength. Manufactured from alloy steel with a black oxide finish, this screw features an 82-degree flat head and a 5/64-inch hex socket drive. It is fully threaded along its 1/4-inch overall length and carries a 5-40 UNC thread form with a Class 3A thread fit. Hardness is rated at 39-44 HRC, making it suitable for demanding mechanical assemblies where a countersunk seating profile is required. Machinists, tool and die technicians, and precision assembly professionals are the primary installers.

This screw is used in precision mechanical assemblies, machine tool fixtures, jigs, and equipment enclosures where the fastener head must sit flush with or below the mating surface. The 82-degree flat head geometry conforms to ASME B18.3 and ASTM F835 standards, making it a drop-in fit for standard countersunk hole patterns in inch-series applications. Its compact 5-40 thread size suits miniature and light-duty assemblies found in instrumentation, electronics enclosures, and small mechanical devices.

Key Features

• 82-degree flat head seats flush in standard countersunk holes per ASME B18.3
• Alloy steel construction with 39-44 HRC hardness for high-strength fastening
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• 5/64-inch hex socket drive for precision torque application in tight spaces
• Fully threaded 1/4-inch overall length maximizes thread engagement
• Class 3A thread fit per UNC standard ensures close-tolerance mating

Compatibility

Designed as an OEM-style replacement or standard-stock flat socket cap screw for inch-series countersunk fastener applications conforming to ASME B18.3 and ASTM F835 specifications.

Installation Notes

Installation requires a 5/64-inch hex key or socket driver. The mating workpiece must have an 82-degree countersunk hole sized to accept the 0.281-inch head diameter to achieve a proper flush seat. Power down and de-energize any equipment before fastener installation or removal when working on electrical or mechanical assemblies. Avoid over-torquing, as alloy steel screws at this thread size are subject to shear if torque limits are exceeded.