Holo-krome 60080 Flat Socket Cap Screw 5/16-18 X 1 in

Product Description

The HOLO-KROME 60080 is a flat socket cap screw designed for applications where a flush or countersunk fastener is required. It features an 82-degree flat head with a 3/16-inch hex socket drive, allowing installation with a standard hex key in tight or recessed spaces. The screw is fully threaded along its 1-inch overall length with a 5/16-18 UNC thread form and a Class 3A thread fit for close-tolerance assemblies. Manufactured from alloy steel and finished in black oxide, it delivers hardness in the 39 to 44 HRC range with moderate corrosion resistance. Maintenance technicians, millwrights, and fabricators working across industrial, mechanical, and structural assemblies are the typical installers of this fastener.

This flat socket cap screw is suited for machine assemblies, jigs, fixtures, and structural components where a low-profile or flush-mount fastener is needed. The 82-degree countersink angle is standard for inch-series applications and aligns with common countersink tooling. Its fully threaded configuration makes it well-suited for through-hole applications or shorter-engagement threaded joints where partial threading would reduce grip. Black oxide finish provides a non-reflective surface and light corrosion protection, making it a practical choice in interior or protected industrial environments.

Key Features

• 82-degree flat head countersink angle — compatible with standard inch-series countersink tooling
• 3/16-inch hex socket drive for hex key installation in recessed or tight spaces
• Fully threaded along the entire 1-inch overall length
• Alloy steel construction with 39 to 44 HRC hardness rating
• Black oxide finish for non-reflective appearance and light surface protection
• Meets ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed for standard 5/16-18 UNC Class 3A threaded holes requiring an 82-degree countersunk flat head fastener in inch-series mechanical and structural assemblies.

Installation Notes

Install using a 3/16-inch hex key or hex bit driver; ensure the mating countersink is machined to 82 degrees for proper head seating and flush fit. De-energize, lock out, and tag out any equipment before fastener removal or installation on live machinery. Verify thread engagement depth meets design requirements for the application load before torquing. Follow applicable ASME or project-specific torque specifications for 5/16-18 alloy steel fasteners.