Value Collection 872401PR Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 872401PR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, fabrication, and industrial maintenance. Manufactured from alloy steel with a zinc-plated finish, this fastener resists corrosion while delivering the tensile strength needed in demanding service environments. The screw uses a 3/8-inch hex drive and is fully threaded with a 1/2-20 UNF thread form along its 2-inch length under head. It conforms to ASME B18.8 and ASTM A574 standards, making it appropriate for safety-critical and precision-tolerance applications. Machinists, millwrights, and maintenance technicians are the primary installers.

This fastener is suited for use in machine frames, motor mounts, tooling fixtures, and general mechanical assemblies where a flush or recessed cap-screw head is required. The fine 1/2-20 UNF thread pitch provides a tighter thread engagement than coarse-thread equivalents, which is advantageous in applications requiring precise clamping force control or where vibration resistance is a priority. The fully threaded configuration maximizes thread engagement along the full grip length, supporting applications with thin mating materials or close-tolerance bore depths.

Key Features

• 1/2-20 UNF fine thread for precise clamping and vibration resistance
• Fully threaded shank — 2 inches length under head
• 3/8-inch internal hex (Allen) drive for high torque input in tight clearances
• Alloy steel construction meets ASTM A574 high-strength requirements
• Zinc-plated finish provides corrosion protection in general indoor and controlled environments
• Conforms to ASME B18.8 and ASTM A574 fastener standards

Compatibility

Designed as a standard replacement or new-installation hex socket cap screw for mechanical assemblies requiring a 1/2-20 UNF fully threaded fastener with a 2-inch length under head and alloy steel construction.

Installation Notes

Installation is performed with a 3/8-inch hex key or Allen socket driver. De-energize and lock out any machinery before replacing fasteners in live mechanical assemblies, per applicable OSHA lockout/tagout procedures. Do not exceed the rated torque range for the fastener grade and thread size as specified in ASME or OEM documentation. Inspect mating threads for damage or contamination before installation to ensure full thread engagement and proper clamping force.