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The 18-8 stainless steel thread cutting screw has a plain finish, a Type F point style, and a hex washer head. 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. The 18-8 stainless steel material provides strength and offers good corrosion resistance in many environments. The material may be slightly magnetic. The hex washer head has six flat sides that a wrench can grip to turn from the side, enabling use when there is no space above the head for a screwdriver. The flange acts like a washer to increase the fastener's bearing surface and distribute the clamping force over a larger area, providing grip and reducing damage to mating surfaces.
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.
Luis Calixto Lopez
Reviewed in the United States on May 8, 2023
Don’t use impact
Bruce Graham
Reviewed in the United States on January 5, 2023
I used these on a strip 6mm hole in an aluminum cover. I would not use stainless as a self-tapping bolt on steel. Might work on cast iron or sheet metal.
Craig Hoffmann
Reviewed in the United States on June 19, 2022
Just what I needed can always count on amazon
Surfnhbusa
Reviewed in the United States on March 9, 2019
The cutting edges on these "self-tapping" bolts were so soft that the cutting edges and threads sheared off before starting to thread into the pre-drilled holes. Very poor quality. The ones I purchased at my local hardware store cost slightly more but were of much better quality.
Mallory and Annette
Reviewed in the United States on April 10, 2019
These bolts worked great for holding a spare tire to the frame of an RV. Simply drilling hole and inserting self tapping bolt was all it took to secure as needed.
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