Holo-krome 61034 Flat Socket Cap Screw 5/16-24 X 3/4 in

Product Description

The HOLO-KROME 61034 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 3/4-inch overall length. The 5/16-24 UNF thread specification and Thread Fit Class 3A ensure close-tolerance engagement suited to precision assemblies. Manufactured from alloy steel and finished in black oxide, it delivers a hardness rating of 39 to 44 HRC. Machinists, maintenance technicians, and mechanical assemblers working on industrial equipment, jigs, fixtures, and structural components are the typical installers.

This screw is well suited to industrial maintenance, mechanical assembly, and fabrication environments where a low-profile countersunk head is required. The fine 5/16-24 UNF thread pitch provides stronger thread engagement and better resistance to vibration loosening compared to coarse-thread equivalents. Black oxide finish offers mild corrosion resistance in dry indoor environments and reduces light reflectivity on tooling and machine surfaces. Conformance to ASME B18.3 and ASTM F835 makes it appropriate for applications requiring documented fastener standards.

Key Features

• 82-degree flat head countersunk profile for flush seating in chamfered bores
• 3/16-inch hex socket drive accepts standard Allen wrenches and hex-bit drivers
• Fully threaded 3/4-inch overall length for maximum thread engagement
• Alloy steel construction with 39 to 44 HRC hardness for high-strength fastening
• Black oxide finish provides mild corrosion resistance and a non-reflective surface
• Meets ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed for use in standard countersunk holes machined to accept 82-degree flat head socket cap screws per ASME B18.3, with 5/16-24 UNF Class 3A tapped threads.

Installation Notes

Installation is performed by machinists or mechanical assemblers using a 3/16-inch hex key or Allen-drive bit. Ensure the mating countersink angle matches the 82-degree head geometry before installation to avoid improper seating. De-energize or lock out any equipment before fastener replacement or maintenance per applicable OSHA lockout-tagout procedures. Do not exceed the rated hardness class by substituting lower-grade fasteners in the same application.