Value Collection 721032PR Flat Socket Cap Screw 4-40

Product Description

The VALUE COLLECTION 721032PR is a flat socket cap screw designed for precision fastening applications where a flush or countersunk head profile is required. Sized at 4-40 x 5/16 inches with full threading, it features an 82-degree flat head and a 1/16 inch hex socket drive. The alloy steel construction with black oxide finish provides solid mechanical strength and moderate corrosion resistance. This fastener is fully threaded along its overall length and conforms to ASME/ANSI B18.3 and ASTM F835 standards. It is installed by machinists, maintenance technicians, and assemblers working in light mechanical, electronic, and precision equipment environments.

This screw is suited for applications where a low-profile or flush-mount fastener is needed on metal or rigid assemblies. The 4-40 UNC thread size makes it common in instrument panels, electronics enclosures, small machine components, and fixture assemblies. The black oxide finish blends with dark anodized or finished surfaces and provides light surface protection in dry or controlled environments. Sold individually with a minimum order quantity of 100 units, making it practical for production runs and bulk assembly operations.

Key Features

• 82-degree flat head for countersunk, flush-mount installation
• 1/16 inch hex socket drive for use with standard hex keys
• Fully threaded along overall length for maximum thread engagement
• Alloy steel construction meets ASTM F835 mechanical requirements
• Black oxide finish for light corrosion resistance and reduced reflectivity
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard inch-series flat socket cap screw for any application requiring a 4-40 UNC threaded, 82-degree countersunk socket fastener per ASME/ANSI B18.3.

Installation Notes

Installation requires a properly sized countersunk hole to seat the 82-degree flat head flush with the mating surface. Use a calibrated 1/16 inch hex key or ball-end driver to avoid stripping the socket. Power down or de-energize any equipment before fastener service when working near electrical components. Follow applicable assembly torque guidelines from the equipment manufacturer or relevant ASME standards.