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The steel thread cutting screw has a black oxide finish, a Type F point style, and an 82-degree flat undercut head with Phillips drive. The type F point is suitable for heavy gauge sheet metal, aluminum, cast iron, brass, and plastic. The screw has machine screw threads that taper down to a blunt point with multiple cutting edges and chip cavities. Steel is often used in applications where strength is the primary consideration. The black oxide finish offers mild corrosion resistance and lubricity. The flat undercut head has a flat top with an 82-degree cone-shaped bearing surface and is undercut to a lower head height for use in shallow countersunk holes. The Phillips drive has an x-shaped slot that accepts a Phillips driver and is designed to allow the driver to slip out of the head to help prevent over-tightening and damage to the thread or fastener.
Thread cutting and thread rolling screws, two types of self-tapping screws, are threaded fasteners that create a mating thread in the wall of a hole. The two screws differ from each other in the way that they create the threads. Thread cutting screws cut the wall of the hole to create the thread, creating material chips that need to be cleared away from the hole to prevent clogging. Thread rolling screws, also called thread forming screws, do not remove material but instead press against the wall of the hole to displace the material and form the threads.
Rob B.
Reviewed in the United States on May 15, 2024
The screws are of typical quality and what I needed. I could buy a lifetime supply of these for what a dozen would cost at the local hardware.
teri anderson
Reviewed in the United States on March 20, 2024
Limited ability to cut threads in stainless steel and would not hold once screw was fully seated (I did not overtighten). Seemed as if the diameter of threads decreased near the head. AVOID!
Dorn W. Stickle
Reviewed in the United States on October 4, 2017
Works as they should
Customer
Reviewed in the United States on May 27, 2016
Great product for the proce.
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