First a little background:Ī screw is really a shaft with a helical groove or thread formed on its surface. Misinformation, incorrect illustrations, screwed up usage of terms on the Internet and elsewhere is rampant and part of the problem created by so many drives. If you disagree with any of the information or if I missed a related drive you know of, please let me know where I can validate the information. Maybe it will be the definitive guide with your help it could get close. This article contains a lot of information and pictures from the Internet. The Allan, Spline, Torx etc drives are not included and maybe neither should the Uni-Screw, it is just so darn new and interesting. Slot type are also included because that is where the screw began and a double slot becomes a cross drive, and the Robertson or square drive enter the story with recent combined Phillips/Square drives. Also presented are the advantages and disadvantages of each drive type. So, why all the confusion? Why all the damaged screw heads and drivers? Why is this screw and driver thing so awkward? Read on and be amazed while I unravel the mystery of screw drives and present some you may have never seen.įor each screw drive type, from ancient Slot through to space-age Lox we present a quick view of the screw head, the drive name, a picture of the appropriate drive bit, followed by an explanation of the type. There are a few other recessed drive screws presented that you also want to be aware. These screw types have a "+" shaped recess on the head and are driven by a cross-head screwdriver, designed originally for use with mass-production mechanical screwing machines. Cross-head, Cross-Point, Cruciform, Square Drive Screws and Drivers
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