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2. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.

3. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   Screwdrivers come in a large range of sizes to accommodate various screws—from tiny jeweller's screwdrivers up. A screwdriver that is not the right size and type for the screw may damage the screw in the process of tightening it. Some screwdriver tips are magnetic, so that the screw (unless non-magnetic) remains attached to the screwdriver.

4. Henry F. Phillips - Wikipedia

   en.wikipedia.org/wiki/Henry_F._Phillips

   After failing to interest manufacturers, Thompson sold his self-centering design to Phillips in 1935. [4] Phillips formed the Phillips Screw Company in 1934. After refining the design (U.S. Patent #2,046,343, U.S. Patents #2,046,837 to 2,046,840) for the American Screw Company of Providence, Rhode Island, Phillips succeeded in bringing the design to industrial manufacturing and promoting its ...

5. What That’s Really For: Items With Hidden Design Features - AOL

   www.aol.com/surprising-purpose-behind-everyday...

   It's common for screwdrivers to have flat-sided handles to improve grip. Many designs go beyond this with a hexagonal shape that fits neatly inside a wrench or ring spanner, which can then be used ...

6. Phillips screwdriver - Wikipedia

   en.wikipedia.org/?title=Phillips_screwdriver&...

   move to sidebar hide. From Wikipedia, the free encyclopedia

7. Cam out - Wikipedia

   en.wikipedia.org/wiki/Cam_out

   The Phillips screwdriver design has a tendency to cam out during operation due to angled contact surfaces, which create an axial force pushing the driver out of the recess as torque is applied. Despite popular belief, [ 2 ] there is no clear evidence that this was a deliberate design feature.