12-24X1/2 Phillips Flat Undercut Thread Cutting Screw Type F Fully Threaded Zinc. Thread-Cutting Type-F threaded screws are used in heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic. In stainless steel, material into which the screw is to cut threads should have a lower hardness by 10-20 Rockwell hardness. Flat undercut heads are used when a flat head is desired on shorter length screws.

8X1/4 Phillips Truss Thread Cutting Screw Type 25 Fully Threaded Zinc Bake. Thread-Cutting Type-25 screws provide excellent chip clearance. Steel: Used in molded or through holes in plastics and other soft materials. Stainless: Material into which the screw is to cut threads should have a lower hardness by 10-20 Rockwell hardness. Truss head screws are weaker than pan or round heads but preferred in applications where minimal clearance exists above the head. Modified truss heads offer low clearance and an extra large bearing surface. Commonly used to attach metal lathe to metal studs.

6X3/8 Phillips Pan Self Tapping Screw Type A B Fully Threaded Zinc Bake. Type AB thread for use in the thinner sheet metal like used in appliances. Pan head screws are a common style that can substituted in most applications for round, truss or binding heads.

12X3/4 #10HD Phillips Pan High Low Screw Fully Threaded Zinc Bake. High-Low thread for use in plastic, nylon, wood or other low-density materials. Thread design reduces driving torques, enhances resistance to thread stripping, improves pullout strength and lessens the risk of cracking the work piece. Pan head screws are a common style that can substituted in most applications for round, truss or binding heads.

14X1 Phillips Flat Undercut Full Thread Self Drilling Screw Zinc Bake. Self drilling screws have point to cut through material and eleiminate the need to drill a pilot hole. Flat undercut heads are used when a flat head is desired on shorter length screws.