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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.
Chris T.
Reviewed in the United States on September 14, 2023
These were just the screws I was looking for to repair the commercial doors.
roxxman
Reviewed in the United States on April 28, 2023
Worked out very well for my needs. Thanks!
S Pierre Jacques
Reviewed in the United States on March 14, 2022
perfect screw for metal door jam
Andrew J.
Reviewed in the United States on September 11, 2021
I went to 4 local hardware stores looking for a suitable screw for our commercial door frames at my fire station and came up empty handed. This screw fit perfectly and solved our issue of loose hinges.
Daniel Kenney
Reviewed in the United States on August 8, 2021
Needed so dif color screws and these worked for me.
RT7765 BOB
Reviewed in the United States on December 9, 2021
I used these in a commercial steel door frame and was very impressed with their durability and their refusal to let you strip their heads.
Christopher Desrochers
Reviewed in the United States on January 11, 2020
Standard thread/length/ undercut head screws for commercial grade door hinges, but they're really hard to find for some reason. These work great!
NoName
Reviewed in the United States on November 24, 2017
These are a perfect fit for commercial door hinge into steel door frame, 12/24 thread size with undercut countersink. I can't find them at any of the local big box store. I was not sure if these were the correct thread size when I bought them, but glad I did.
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