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The steel self-drilling screw with zinc plating has a wafer head and a star drive. Steel is often used in applications where strength is the primary consideration. The zinc plating offers corrosion resistance and has a reflective appearance. The wafer head has a flat top, a 70-degree cone-shaped bearing surface, and a small slope between the top and the bearing surface that helps create a flush fit. The star drive, also called a Torx drive, has a six-pointed indentation that provides a large contact area for the driver, resisting slippage better than a Phillips or slotted drive. A star drive requires use of a Torx driver for installation and removal.
Self-drilling screws, a type of self-tapping screw, are threaded fasteners that drill their own hole and thread it as they are installed. Usually only recommended for use with metal, self-drilling screws are available with wings that enable use when fastening wood to metal. The drill point length should be long enough to penetrate both materials being fastened before the threading portion reaches the material.
chris
Reviewed in Canada on September 17, 2024
I would not buy these again, they broke off when drilling , had to pre drill the hole so I could finish the jobPoor quality
vern c.
Reviewed in Canada on July 19, 2024
good
Dan Barriger
Reviewed in the United States on July 11, 2024
Hex is smaller than I had hoped. Strips easily. Not what I had hoped.
SGMilkman
Reviewed in the United States on May 7, 2024
The price was ok and they are strong, but the design doesn’t work for self-tapping wood-on-metal. Tek screws like this, while pricier, have “wings” on the drilling tip (see photos) that break off after drilling through the wood and hit metal, preventing the threads from biting into the wood thus allowing the self-tapping tip to drill freely through the metal you are mounting to. These screws do not. I was able to make these work only by pre-drilling the holes through both the wood and metal, defeating the purpose of self-tapping screws.
Customer
Reviewed in the United States on March 28, 2024
I used these on 14 gauge steel tube and about every third one of these had the tip break off, making it useless. I'm not a big metal guy, so maybe this is normal? When they worked, they worked really well! And if it weren't for the star drive, I probably would have thrown the whole bag in the trash! If you don't use a lot of self-tappers, or you need them for a lighter gauge sheet metal, these are fine, just buy more than you need!
Dan Charron
Reviewed in Canada on November 4, 2024
Used to mount foam insulation in enclosed trailer screwed in with ease
Joe
Reviewed in Canada on November 20, 2024
No issues yet will advise if there is any problem with these fasteners. Glad the required size was available.
Customer
Reviewed in the United States on April 13, 2024
I use these to hold down the plywood decking on my trailer. I like them because they go And nice and smooth so the head doesn’t stick up
BTRettig
Reviewed in the United States on October 29, 2023
When you need a self-tapping screw with a large head on it this is the way to go these work great would buy again
Yvan Berthiaume
Reviewed in Canada on September 14, 2022
Excellent
Scott in Florida
Reviewed in the United States on March 1, 2021
Absolute junk. I've just gone through 30 screws to achieve 8 fastened points. Self drilling function isn't working in cold rolled steel. Either they just spin or the TORX starts stripping out. Now job is held up.
Beau Fam
Reviewed in the United States on February 7, 2017
I used these to install new 5/8" marine grade plywood to my snowmobile trailer. It uses a T20 bit. Worked great! My advice, pre-drill the wood only and install.
THEFIXMAN
Reviewed in the United States on November 26, 2017
great screw, used them to re-deck my snowmobile trailer, did a great job
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