Value Collection 211020PR Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 211020PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head driven by a 1/16-inch hex socket, making it suitable for tight-clearance installations where a low-profile head is essential. Machined from alloy steel with a black oxide finish, it offers improved corrosion resistance and reduced light reflection. The screw is fully threaded at a 4-40 UNC thread specification and measures 5/8 inches in overall length. Licensed tradespeople and assembly technicians working on mechanical, industrial, or precision equipment installations are the primary users of this fastener.

This screw is appropriate for light-duty mechanical assemblies, jigs, fixtures, electronic enclosures, and precision instrument housings where a flush fastener surface is required. The 4-40 thread size is common in small-frame applications including electrical components, panel hardware, and instrumentation. The black oxide finish blends into dark substrates and provides a measure of surface protection in dry or mildly humid environments. Fully threaded construction ensures maximum thread engagement across the full fastener length, which is particularly useful in thin-material applications.

Key Features

• 82-degree flat head profile for flush or countersunk seating
• 1/16-inch hex socket drive for precise torque application in confined spaces
• Fully threaded along entire 5/8-inch length for maximum thread engagement
• Alloy steel construction for strength in small-diameter fastener applications
• Black oxide finish for surface protection and low-reflectance appearance
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard inch-series flat socket cap screw compatible with 4-40 UNC threaded holes in metal, plastic, and composite assemblies requiring a countersunk fastener per ASME/ANSI B18.3.

Installation Notes

Installation should be performed by a qualified mechanic, assembler, or technician using a properly sized 1/16-inch hex key or Allen driver. Ensure the mating threaded hole or insert is clean and free of debris before driving the fastener. Use a countersink bit matched to the 82-degree head angle to prepare receiving holes in non-pre-machined material. Do not exceed the rated drive engagement to avoid stripping the hex socket on this small-diameter fastener.