Holo-krome 61024 Flat Socket Cap Screw 1/4-28 X 1 in

Product Description

The HOLO-KROME 61024 is a fully threaded flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head driven by a 5/32-inch hex socket and is manufactured from alloy steel with a black oxide finish. The 1/4-28 UNF thread and 1-inch overall length make it suitable for close-tolerance assemblies where a standard cap screw head would protrude. Hardness is rated at 39 to 44 HRC, meeting ASME B18.3 and ASTM F835 standards. This fastener is installed by machinists, maintenance technicians, and mechanical contractors working on precision equipment and structural assemblies.

This screw is used in applications where a flush surface is required after installation, such as machine frames, fixtures, tooling plates, and mechanical assemblies across industrial, commercial, and manufacturing environments. The 1/4-28 fine thread provides higher thread engagement and vibration resistance compared to coarse-thread equivalents, making it well suited for metal-to-metal joints where torque retention is critical. It is sold in minimum order quantities of 100 pieces.

Key Features

• 82-degree flat head seats flush in standard countersunk holes per ASME B18.3
• 5/32-inch hex socket drive for use with standard Allen keys or hex bit drivers
• Fully threaded 1/4-28 UNF shank over 1-inch overall length
• Alloy steel construction with 39 to 44 HRC hardness rating
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Thread fit class 3A for close-tolerance, high-strength applications
• Meets ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed for use in countersunk holes machined to 82-degree included angle per ASME B18.3 specifications, compatible with standard 1/4-28 UNF tapped holes in metal assemblies and fixtures.

Installation Notes

Installation is performed by machinists or mechanical technicians using a 5/32-inch hex key or socket driver. Ensure the mating countersink is machined to the correct 82-degree angle and depth before driving the fastener. De-energize and lock out any equipment before replacing fasteners in live assemblies. Follow applicable torque guidelines for 1/4-28 Grade 8 or equivalent alloy steel fasteners as specified by the equipment manufacturer or applicable industry standards.