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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. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   A screwdriver is classified by its tip, which is shaped to fit the driving surfaces (slots, grooves, recesses, etc.) on the corresponding screw head. 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.

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. Computer case screws - Wikipedia

   en.wikipedia.org/wiki/Computer_case_screws

   All three patterns may also be combined with a slot for a flat-blade screwdriver. Usually they are provided with a 1/4 in (0.25 inches (6.4 mm)) flanged hex head. Non-standard metricized 5.5 millimetres (0.22 in) flanged hex heads can also be encountered. Also common are pan head screws - a low disk with a chamfered outer edge.

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Concrete screws are commonly blue in color, with or without corrosion coating. They may either have a Phillips flat head or a slotted hex washer head. Nominal (thread) sizes range from 0.1875 to 0.375 in (4.763 to 9.525 mm) and lengths from 1.25 to 5 in (32 to 127 mm).

7. Every Farmer Needs This Solar-Power Phone Charger

   www.aol.com/lifestyle/every-farmer-needs-solar...

   From pint-size stocking ... but especially for farmers. It's a pen that doubles as a ruler, level, stylus, and Phillips head and Flathead screwdriver. ... Rechargeable 4V Cordless Screwdriver.