Holo-krome 720000370 Hex Socket Cap Screw 5-40 Unc

Product Description

The HOLO-KROME 720000370 is a hex socket cap screw designed for precision fastening applications requiring a compact drive profile and reliable clamping strength. It features a 5-40 UNC thread size with a 1-inch length under head and is partially threaded along the shank. The 3/32-inch hex socket drive accepts a standard Allen key or hex bit driver. Constructed from alloy steel with a black oxide finish coating, this screw provides moderate corrosion resistance and reduces light reflection in low-visibility or finished assemblies. It conforms to ASME B18.3 and ASTM A574 standards, making it suitable for controlled torque applications where dimensional consistency is required.

This screw is used in light mechanical assemblies, instrumentation, electronics enclosures, and precision machine components where fine-thread engagement and a low-profile socket head are needed. The 5-40 UNC thread is a fine-pitch designation typically found in small-bore tapped holes in metal substrates. The partial threading allows for a smooth shank section that aids in alignment during assembly. Machinists, millwrights, maintenance technicians, and electronics assembly professionals typically source this fastener for OEM builds and equipment repairs.

Key Features

• 5-40 UNC thread size for fine-pitch engagement in small tapped holes
• 1-inch length under head with partial threading along the shank
• 3/32-inch hex socket drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and a matte appearance
• Conforms to ASME B18.3 dimensional standards for consistent fitment

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application with a 5-40 UNC tapped hole requiring a 1-inch length under head fastener.

Installation Notes

Installation is performed using a 3/32-inch hex key or hex bit driver. Ensure the mating tapped hole is clean and free of debris before driving to avoid cross-threading in the fine 5-40 UNC thread form. Do not use power tools at high torque settings without a calibrated torque limiting attachment, as small-diameter alloy screws are susceptible to over-torque shear. Follow applicable equipment manufacturer torque specifications for the assembly.