Holo-krome 61058 Flat Socket Cap Screw 1/2-20 X 1-3/4 in

Product Description

The HOLO-KROME 61058 is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features a 82-degree flat head driven by a 5/16-inch hex socket, and is fully threaded along its 1-3/4-inch overall length. The thread specification is 1/2-20 UNF, conforming to ASME B18.3 and ASTM F835 standards. Constructed from alloy steel with a black oxide finish, this screw delivers reliable clamping strength and moderate corrosion resistance in mechanical assemblies, tooling fixtures, and industrial equipment.

This screw is suited for residential and commercial mechanical applications where a low-profile, countersunk fastener is required. It is commonly installed in machine components, precision fixtures, and structural assemblies where a flush surface finish is necessary. The 1/2-20 UNF fine thread pitch provides strong thread engagement and is typically used in applications demanding tight tolerances and vibration resistance. Machinists, millwrights, and maintenance technicians are the primary installers of this fastener type.

Key Features

• 82-degree flat head geometry provides a flush, countersunk installation profile
• 5/16-inch hex socket drive for standard Allen wrench or hex bit installation
• 1/2-20 UNF fully threaded for maximum thread engagement along the full 1-3/4-inch length
• Alloy steel construction for high tensile strength in demanding mechanical applications
• Black oxide finish offers mild corrosion resistance and reduced surface glare
• Conforms to ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-specification fastener for any application requiring a 1/2-20 UNF flat socket cap screw per ASME B18.3.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 5/16-inch hex key or hex socket driver. Ensure the mating countersink is machined to an 82-degree angle to achieve proper head seating. Apply appropriate thread lubricant or thread-locking compound as required by the assembly specification. De-energize and lock out any powered equipment before fastener replacement or service.