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The steel thread rolling screw for use in plastic has a black oxide finish and a pan head with a Phillips drive. Steel is often used in applications where strength is the primary consideration. The black oxide finish offers mild corrosion resistance and lubricity. The pan head has a flat top and short vertical sides with a rounded top edge. 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.
Hobee
Reviewed in the United States on March 30, 2017
These are designed to screw into preexisting holes in plastic where there is enough plastic for the threads to cut into. I believe the brand name for this type of screw is Plastite. Amazon has a great price for these. I have actually seen these same screws for over a dollar each at some online sights. Amazon also has a good selection of finishes and drive types. My project needed them in black. If these are what you need then you found a good source that doesn't clean out your wallet.
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