4-40 x 5/16 Phillips Flat Undercut Machine Screw Fuly Threaded 18-8 Stainless Steel Black Ox 12-24-2 The threaded insert allows for

The threaded insert allows for easy attachment of screws or bolts

With their precise threads and sharp points

This lock nut is easy to install and remove

making it ideal for use in countersunk holes

4-40 x 5/16 Phillips Flat Undercut Machine Screw Fuly Threaded 18-8 Stainless Steel Black Ox 12-24-2 The threaded insert allows forThe 4 40 x 5 16 Phillips Flat Undercut Machine Screw is a fully threaded screw made of 18 8 stainless steel with a black oxide finish. It has a Phillips drive and a flat undercut head. This screw is designed for use in a variety of applications, including metal, plastic, and wood. It is corrosion resistant and has a high strength to weight ratio.