Holo-krome 60140 Flat Socket Cap Screw 1/2-13 X 3 in

Product Description

The HOLO-KROME 60140 is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. Sized at 1/2-13 UNC x 3 inches overall length, it features an 82-degree flat head with a 5/16-inch hex socket drive and a partially threaded shank. Manufactured from alloy steel with a black oxide finish, it carries a hardness rating of 39-44 HRC, making it suitable for high-strength mechanical assemblies. It conforms to ASME B18.3 and ASTM F835 standards. Licensed trades and industrial maintenance technicians install this fastener wherever a recessed drive and low-profile head are required.

This screw is used in mechanical, structural, and equipment assembly applications where a countersunk head must sit flush with or below the mating surface. The partially threaded shank provides a smooth bearing surface in the unthreaded portion, which is useful in applications with close-tolerance bores or where shank strength matters. It is appropriate for ferrous and non-ferrous assemblies in industrial, commercial, and heavy-duty equipment contexts. The black oxide finish provides mild corrosion resistance and reduces light reflection in precision tooling and machinery environments.

Key Features

• 82-degree flat head profile for countersunk flush-mount installations
• 5/16-inch hex socket drive for high torque input with standard hex keys or Allen drivers
• Alloy steel construction with 39-44 HRC hardness for high-strength service
• Black oxide finish for mild corrosion resistance and reduced reflectivity
• Partially threaded shank with 1/2-13 UNC thread fit class 3A
• Conforms to ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or service fastener for mechanical assemblies requiring a 1/2-13 UNC flat socket cap screw per ASME B18.3 specification.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with socket cap screws and countersunk hole preparation. Ensure the mating countersink is machined to the correct 82-degree included angle before installing. Torque to the value specified by the equipment manufacturer for the applicable joint material and lubrication condition. Use a properly sized 5/16-inch hex key or driver to avoid rounding the socket drive.