Value Collection 872041PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 872041PR is a hex socket cap screw designed for precision fastening in mechanical assemblies, fixtures, and equipment. It features a 4-40 UNC thread form and a 3/4-inch length under head with full threading from shoulder to tip. The 3/32-inch internal hex drive accepts a standard Allen key or hex bit driver. Constructed from alloy steel with a zinc-plated finish, this fastener delivers solid tensile strength alongside basic corrosion resistance for indoor and light-duty industrial applications. Machinists, millwrights, and mechanical assemblers use this screw where a low-profile cap head and flush-clearance drive are required.

This screw is suited for light-gauge metal fabrication, precision instrument assembly, electronics enclosures, and general mechanical assembly where a 4-40 UNC thread pitch is specified. The fully threaded shank allows engagement along the full grip length, which is useful in thin-material applications. The zinc coating provides a barrier against mild oxidation during storage and service in non-harsh environments. This fastener is sold individually per package, with a minimum order quantity of 100 pieces.

Key Features

• 4-40 UNC thread form — fine pitch for secure engagement in light-gauge and thin-wall materials
• 3/4-inch length under head with full threading along the entire shank
• 3/32-inch hex socket drive for Allen key or hex bit installation
• Alloy steel construction meets ASME B18.8 and ASTM A574 fastener standards
• Zinc-plated finish for corrosion resistance in standard indoor service conditions

Compatibility

Designed as a standard 4-40 UNC hex socket cap screw suitable for use wherever ASME B18.8 or ASTM A574 compliant fasteners are specified in mechanical and light industrial assemblies.

Installation Notes

Installation is performed by mechanical assemblers or machinists using a 3/32-inch hex key or hex bit driver. Ensure mating threaded holes are tapped to 4-40 UNC specification and free of debris before driving. Do not exceed the rated drive engagement by using an oversized or worn key, as this can damage the socket recess. Follow applicable ASME or equipment manufacturer torque guidelines for 4-40 alloy steel fasteners when torque requirements are specified by the application.