Holo-krome 73020 Hex Socket Cap Screw 6-40 Unf Alloy Steel

Product Description

The HOLO-KROME 73020 is a hex socket cap screw designed for applications requiring a precise, high-strength fastener in a compact drive format. Threaded 6-40 UNF with a 3/8-inch length under head, this screw is fully threaded and accepts a 7/64-inch hex drive. Manufactured from alloy steel and finished with a black oxide coating, it meets ASME B18.3 and ASTM A574 standards. The black oxide finish provides mild corrosion resistance and reduces light reflection, making it suitable for both functional and semi-exposed installations. Licensed trades and production assemblers rely on this specification for close-tolerance mechanical assemblies.

This screw is used in light mechanical assemblies, instrumentation, and precision equipment where a fine-thread UNF fastener is required. The 6-40 UNF thread pitch is standard in applications demanding higher thread engagement strength than coarse-thread alternatives in thin or harder materials. Fully threaded construction allows maximum thread engagement across the entire 3/8-inch shank length. It is appropriate for both production-line assembly and field repair scenarios where controlled torque and thread integrity are critical.

Key Features

• 6-40 UNF fine thread for high thread engagement in tight tolerances
• Fully threaded 3/8-inch length under head for maximum grip across full shank
• 7/64-inch hex socket drive compatible with standard hex keys and ball-end drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application specifying a 6-40 UNF fully threaded socket head cap screw with a 3/8-inch length under head.

Installation Notes

Installation should be performed by a qualified mechanic or assembler using a calibrated hex key or torque driver sized to 7/64 inch. Power down and de-energize any equipment before fastener removal or replacement. Do not exceed the design torque specification for the mating material, particularly in aluminum or plastic housings where thread stripping is a risk. Ensure mating threads are clean and free of debris before installation.