Holo-krome 61030 Flat Socket Cap Screw 5/16-24 X 1/2 in

Product Description

The HOLO-KROME 61030 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 3/16-inch hex socket drive and is fully threaded along its 1/2-inch overall length. The thread is 5/16-24 UNF, a fine-pitch specification that provides stronger clamp load and better resistance to loosening under vibration compared to coarse-thread equivalents. Manufactured from alloy steel with a black oxide finish, the screw carries a hardness rating of 39-44 HRC and meets ASME B18.3 and ASTM F835 standards. It is installed by mechanical assemblers and maintenance technicians in precision equipment, fixtures, and structural assemblies where a recessed head is required.

This screw is suited for use in machine components, tooling fixtures, and industrial equipment where a flush seating surface is needed. The fine 5/16-24 UNF thread class 3A fit ensures tight tolerance engagement, making it appropriate for applications subject to vibration or dynamic loading. The black oxide finish provides moderate corrosion resistance and reduces light reflection in optical or precision mechanical assemblies. This fastener is sold in multiples of 100 units per order.

Key Features

• 82-degree flat head profile for flush or countersunk installations
• 3/16-inch hex socket drive for standard Allen wrench engagement
• 5/16-24 UNF fine-pitch thread with class 3A fit for tight tolerance applications
• Alloy steel construction rated 39-44 HRC for high-strength fastening
• Black oxide finish for moderate corrosion resistance and low reflectivity
• Meets ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or direct-use flat socket cap screw for machinery, fixtures, and assemblies requiring a 5/16-24 UNF countersunk hex socket fastener conforming to ASME B18.3.

Installation Notes

Installation is performed using a 3/16-inch hex key or Allen-drive bit; use calibrated torque equipment where fastener clamp load is critical. Ensure the mating countersink is machined to 82 degrees to achieve full head seating. De-energize all relevant equipment before performing fastener service on live assemblies. Do not reuse fasteners that show thread damage, galling, or deformation.