Value Collection MP72018 Hex Socket Cap Screw 4-40 Unc 50pk

Product Description

The VALUE COLLECTION MP72018 is a hex socket cap screw designed for precision fastening applications requiring a compact drive profile and reliable clamping force. Sized at 4-40 UNC with a 1/4 inch length under head and a 3/32 inch hex drive, this screw is fully threaded and manufactured from alloy steel with a black oxide finish. The black oxide coating provides a degree of corrosion resistance while reducing light reflection, which is useful in instrumentation, electronics enclosures, and close-tolerance mechanical assemblies. This package contains 50 screws. Machinists, maintenance technicians, and electromechanical assembly workers are the typical installers.

These socket cap screws are suited for applications where a low-profile, high-strength fastener is needed in tight clearance conditions. The 4-40 UNC thread designation is common in light-duty machine assemblies, electronic chassis, jigs, fixtures, and precision instruments. The 3/32 inch hex drive requires a matching hex key or Allen driver for installation. Fully threaded along the shank length, these screws provide maximum thread engagement for their size, making them appropriate for shallow through-hole and tapped-hole applications in metal and rigid plastic components.

Key Features

• 4-40 UNC thread size for use in standard inch-series tapped holes
• 1/4 inch length under head — fully threaded for maximum thread engagement
• 3/32 inch hex socket drive for use with standard Allen keys
• Alloy steel construction for higher strength than standard steel fasteners
• Black oxide finish for mild corrosion resistance and low-reflectance appearance
• Meets ANSI B18.3, ANSI B18.8.2, ANSI B2.2, and MS16555 fastener standards
• Sold in a 50-piece package — practical quantity for small-batch production or repair stock

Compatibility

Designed as a standard inch-series socket cap screw compatible with any application requiring a 4-40 UNC tapped hole and a 1/4 inch length under head fastener per ANSI B18.3 specification.

Installation Notes

Installation requires a 3/32 inch hex key or T-handle Allen driver. Ensure the mating tapped hole conforms to 4-40 UNC thread form before driving the screw to avoid cross-threading. Torque to the assembly specification established for the application and base material — do not exceed the rated capacity of the alloy steel fastener or the strength of the mating material. Depressurize, de-energize, or otherwise make safe any assembly before removing or replacing fasteners in service.