Holo-krome 78010 Hex Socket Cap Screw 4-40 Unc Stainless

Product Description

The HOLO-KROME 78010 is a hex socket cap screw designed for precision fastening in applications requiring a compact, recessed-drive profile. Threaded 4-40 UNC with a 1/4 inch length under head, this fastener is fully threaded and driven by a 3/32 inch hex key. Manufactured from 18-8 stainless steel with a bright, uncoated finish, it resists corrosion without added surface treatments. It meets ASME B18.3 and ASTM F837 standards, making it suitable for controlled-environment assemblies, equipment enclosures, and light mechanical fixtures where dimensional consistency and material integrity are required.

This screw is used wherever a low-profile, socket-drive fastener is needed in tight clearance conditions. Typical applications include instrument panels, electronic enclosures, HVAC equipment brackets, and precision mechanical assemblies. The 4-40 UNC thread pitch is common in small-scale equipment where fine thread engagement and controlled clamping loads matter. Licensed trades including HVAC technicians, electricians, and mechanical contractors use these fasteners during equipment assembly, panel work, and component replacement on both residential and light commercial systems.

Key Features

• 4-40 UNC thread size with full threading along the 1/4 inch shank length under head
• 3/32 inch hex socket drive for use in confined or recessed locations
• 18-8 stainless steel construction provides corrosion resistance without plating
• Bright, uncoated finish maintains dimensional tolerance per ASME B18.3
• Meets ASTM F837 for stainless steel socket cap screws

Compatibility

Designed as a standard 4-40 UNC hex socket cap screw per ASME B18.3, compatible with any tapped hole or threaded insert meeting 4-40 UNC specifications in mechanical, electrical, or HVAC equipment assemblies.

Installation Notes

Install using a calibrated 3/32 inch hex key or Allen driver. Ensure the mating threaded hole is clean and free of debris before engagement. Power down and de-energize any electrical or mechanical system before accessing fastener locations on live equipment. Avoid over-torquing stainless steel fasteners, as galling can occur without lubrication on fine-thread stainless applications.