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2. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2 mm, 4.6 mm, 6.4 mm and 7.7 mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DTC-20 and ...

3. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/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 .

4. 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 ...

5. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   Proper use requires that the screwdriver's tip engage the head of a screw of the same size and type designation as the screwdriver tip. Screwdriver tips are available in a wide variety of types and sizes (List of screw drives). The two most common are the simple 'blade'-type for slotted screws, and Phillips, generically called "cross-recess ...

6. Torx - Wikipedia

   en.wikipedia.org/wiki/Torx

   An External Torx version exists, also known as Inverted Torx, where the screw head has the shape of a Torx screwdriver bit, and a Torx socket is used to drive it. The external "E" Torx nominal sizing does not correlate to the "T" size, (e.g. an E40 socket is too large to fit a T40 Torx bit, while an E8 Torx socket will fit a T40 Torx bit [6]).

7. Yankee screwdriver - Wikipedia

   en.wikipedia.org/wiki/Yankee_screwdriver

   Drill points for the smallest 133/135 size screwdriver; adapters to adapt push drill size drill point sets to the three sizes of screwdriver chuck size; countersinks; screwdriver tips holding with screw holding feature; Phillips screwdriver tips in various sizes (Ph#1 to Ph#3 in 5/16" and 9/32" shank models, Ph#1 and Ph#2 sizes only for the 7/ ...