Value Collection 721038PR Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 721038PR is a flat socket cap screw designed for precision fastening applications where a flush or countersunk head profile is required. Made from alloy steel with a black oxide finish, this screw provides corrosion resistance and a clean, low-profile appearance once installed. It uses a 1/16 inch hex socket drive and features an 82-degree flat head angle, conforming to ASME/ANSI B18.3 and ASTM F835 standards. The 4-40 UNC thread and 1-1/4 inch overall length make it suitable for light-duty mechanical assemblies. The threading is partial, which is standard for longer fasteners at this size. Installers working on precision equipment, enclosures, or fixtures will find this screw appropriate for countersunk hole applications requiring a clean seating surface.

This screw is well suited for use in electrical enclosures, instrument panels, light mechanical assemblies, and fabricated components where a flush fastener is required. The 4-40 UNC thread is commonly found in small-format applications across electrical, HVAC control board mounting, and general trade work. The black oxide finish reduces glare and provides mild corrosion protection in indoor environments. This part is sold individually but requires a minimum order quantity of 100 units per order.

Key Features

• 82-degree flat head angle for flush countersunk seating per ASME/ANSI B18.3
• 1/16 inch hex socket drive for precise torque application with standard Allen keys
• Alloy steel construction provides strength suitable for light mechanical fastening
• Black oxide finish offers mild corrosion resistance and low-glare appearance
• Partial threading along the shank, standard for this fastener length and thread size
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard 4-40 UNC flat socket cap screw suitable for countersunk hole applications in light mechanical assemblies, enclosures, and fabricated components that require ASME/ANSI B18.3 conforming fasteners.

Installation Notes

Installation requires a 1/16 inch hex key or Allen driver. Ensure the mating countersink is machined to an 82-degree angle to achieve proper flush seating. Power down any electrical equipment before installing or removing fasteners in live panels or enclosures. Do not overtighten small-diameter screws such as 4-40; use a calibrated torque driver where fastener integrity is critical.