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  2. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    Flat-blade jeweler's screwdrivers and the tips found in 1 ⁄ 4-inch or 6.4-millimeter drive sets are generally hollow-ground. Note that it is this typical chisel shape which allows 9 screwdriver sizes to drive 24 different slotted screw sizes, with the drawbacks of not fitting as closely as a hollow-ground screwdriver would, and increasing the ...

  3. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.

  4. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    They have advantages over Forstner bits when boring into end grain. Bits are commonly available in sizes from 8–50 mm (0.3–2.0 in) diameter. Sawtooth bits are available up to 100 mm (4 in) diameter. Originally the Forstner bit was very successful with gunsmiths because of its ability to drill an exceedingly smooth-sided hole. [citation needed]

  5. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    Drill bit sizes are written as irreducible fractions. So, instead of 78/64 inch, or 1 14/64 inch, the size is noted as 1 7/32 inch. Below is a chart providing the decimal-fraction equivalents that are most relevant to fractional-inch drill bit sizes (that is, 0 to 1 by 64ths).

  6. List of floppy disk formats - Wikipedia

    en.wikipedia.org/wiki/List_of_floppy_disk_formats

    3 1 ⁄ 2 inch Double 1 80 9 512 soft 360 kB 300 MFM 2 720 kB High 18 1,440 kB Coleco ADAM: 5 1 ⁄ 4 inch Double 1 40 8 512 soft 160 kB 300 MFM Commodore 64 (8-bit) 5 1 ⁄ 4 inch Double 1 35 Variable (17-21) ZCAV: 256 soft 170 kB 300 GCR [NB 6] 2 340 kB Quad 1 77 Variable (23-29) ZCAV 521 kB 2 1,042 kB 3 1 ⁄ 2 inch Double 2 80 10 512 800 kB MFM

  7. Pentalobe screw - Wikipedia

    en.wikipedia.org/wiki/Pentalobe_screw

    Pentalobe screws were adopted by Apple starting in 2009, when they were first implemented in the 15-inch MacBook Pro. They have since been used on other MacBook Pro, MacBook Air and iPhone models. Apple attracted criticism upon the introduction of the pentalobe screw; it was seen by some as an attempt to lock individuals out of their devices. [2]

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