6-20X1/4 Slotted Indented Hex Washer Thread Cutting Screw Type 25 Full Threaded Zinc Bake 10000 pcs

5/16-18X1 1/4 Six Lobe Pan Thread Cutting Screw Type 23 Fully Threaded Zinc Bake. Thread-Cutting Type-23 screws provide excellent chip clearance with minimum tightening torques. Steel: Used in cast iron and zinc, aluminum die castings, and plastics. Stainless: Material into which the screw is to cut threads should have a lower hardness. Pan head screws are a common style that can substituted in most applications for round, truss or binding heads.

1/4-20X1 1/4 Six Lobe Flat Thread Cutting Screw Type F Fully Threaded Zinc Bake. 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 head screws are used when protrusion of the fastener above the mating surface is unacceptable. Typically 100 degree flat or for fastening softer materials, 82 degrees flat.

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.

4X3/8 #3HD Six Lobe 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.

3/8-16X1 Unslotted Indented Hex Washer 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. Indented hex washer head offers advantages of hex head, plus greater protection to mating surface.