Holo-krome 72026 Hex Socket Cap Screw 4-40 Unc Alloy Steel

Product Description

The HOLO-KROME 72026 is a hex socket cap screw designed for precision fastening in mechanical assemblies, tooling fixtures, and industrial equipment. It features a 4-40 UNC thread and a 3/4-inch length under head, with full threading along the shank. The 3/32-inch hex drive requires a standard hex key or Allen wrench for installation. Constructed from alloy steel with a black oxide finish, this screw offers improved corrosion resistance and a clean, low-reflectance appearance suitable for close-tolerance applications. Licensed trades and maintenance technicians working on precision machinery, instrumentation, and fabricated assemblies rely on this style of fastener for consistent clamping load in confined spaces.

This screw is suited for light-duty mechanical and instrumentation applications where a small-diameter, fine-pitch thread is required. The 4-40 UNC thread pitch is common in control panels, sensor housings, small motor assemblies, and electronic enclosures. The black oxide alloy steel construction makes it appropriate for indoor mechanical environments. Minimum order quantity is 100 pieces, sold as a package quantity of 1.

Key Features

• 4-40 UNC thread for precise engagement in fine-thread tapped holes
• Fully threaded shank provides maximum thread engagement along the full 3/4-inch length under head
• Alloy steel construction meets strength requirements for small-diameter socket cap screws
• Black oxide finish reduces surface corrosion and minimizes light reflection in instrumentation use
• 3/32-inch hex socket drive compatible with standard hex keys
• Meets ASME B18.3 and ASTM A574 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-supply hex socket cap screw for any application requiring a 4-40 UNC fully threaded alloy steel socket cap screw per ASME B18.3 and ASTM A574.

Installation Notes

Installation should be performed by a qualified technician or machinist familiar with small-diameter fastener torque limits. Use a properly sized 3/32-inch hex key to avoid rounding the socket drive. Always verify the mating tapped hole thread form and depth before installation to prevent cross-threading. Avoid applying thread-locking compounds unless the specific assembly requires it, as over-application can complicate removal of small-diameter fasteners.