Value Collection 872039PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 872039PR is a hex socket cap screw designed for precision fastening in mechanical assemblies and structural applications. Manufactured from alloy steel with a zinc-plated finish, this fastener provides corrosion resistance and mechanical strength suitable for demanding environments. It features a 4-40 UNC thread size, a length under head of 0.625 inches, and is fully threaded along its entire shank. The 3/32-inch hex drive accepts standard hex keys and Allen wrenches for installation and removal. Installers in manufacturing, maintenance, and machine assembly rely on this size for fine-thread applications where precise torque control and vibration resistance are required.

This screw is suited for use in light machinery, instrumentation panels, electronic enclosures, and small mechanical assemblies requiring a 4-40 UNC fine-thread fastener. The zinc plating adds a layer of protection against oxidation in both indoor and moderate-exposure environments. The fully threaded design maximizes thread engagement along the full length of the screw, which is particularly useful in thin-material and blind-hole applications. Maintenance technicians and machine assemblers commonly specify this fastener for repair and original equipment builds alike.

Key Features

• 4-40 UNC thread size for fine-thread fastening applications
• Fully threaded shank maximizes thread engagement in thin materials
• Alloy steel construction for high tensile strength
• Zinc-plated finish provides corrosion and oxidation resistance
• 3/32-inch hex socket drive compatible with standard hex keys
• Meets ASME B18.8 and ASTM A574 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-use fastener for assemblies requiring a 4-40 UNC hex socket cap screw with a 5/8-inch length under head and fully threaded shank.

Installation Notes

Installation is performed with a 3/32-inch hex key or Allen wrench. Confirm the mating thread is clean and free of debris before driving the screw to prevent cross-threading. De-energize any electrical or mechanical equipment before replacing fasteners on active assemblies. Follow applicable ASME torque guidelines for 4-40 UNC alloy steel fasteners to avoid stripping the socket or over-stressing the thread.