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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. Henry F. Phillips - Wikipedia

   en.wikipedia.org/wiki/Henry_F._Phillips

   Phillips screw head. Henry Frank Phillips (June 4, 1889 – April 13, 1958) was an American businessman from Portland, Oregon. The Phillips-head ("crosshead") screw and screwdriver are named after him. [1] The importance of the crosshead screw design lies in its self-centering property, useful on automated production lines that use powered ...

4. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   Screwdriver with rubber handle. The tool used to drive a slotted screw head is called a standard, common blade, flat-blade, slot-head, straight, flat, flat-tip, [ 6 ] or " flat-head " [ 7 ] screwdriver. This last usage can be confusing, because the term flat-head also describes a screw with a flat top, designed to install in a countersunk hole.

5. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   Robertson screw. A Robertson screw, also known as a square screw[1] or Scrulox, [2] is a type of screw with a square -shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper. The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly ...

6. Fractional-horsepower motor - Wikipedia

   en.wikipedia.org/wiki/Fractional-horsepower_motor

   Fractional-horsepower motor. A fractional-horsepower motor (FHP) is an electric motor with a rated output power of less than one horsepower (745.7 W) (the term 'fractional' indicates less than one unit). There is no defined minimum output, however, it is generally accepted that a motor with a frame size of less than 35mm square can be referred ...

7. Hex key - Wikipedia

   en.wikipedia.org/wiki/Hex_key

   A hex key (also, hex wrench, Allen key and Allen wrench or Inbus) is a simple driver for bolts or screws that have heads with internal hexagonal recesses (sockets). Hex keys are formed from a single piece of hard hexagonal steel rod, having blunt ends that fit snugly into similarly shaped screw sockets. The rods are bent to 90º, forming two ...