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  2. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    The bolt circle diameter is typically expressed in mm and accompanies the number of bolts in your vehicle's bolt pattern. One example of a common bolt pattern is 5x100 mm. This means there are 5 bolts evenly spaced about a 100 mm bolt circle. The picture to the right is an example of a 5×100 mm bolt pattern on a Subaru BRZ. The wheel has 5 lug ...

  3. Toyota R engine - Wikipedia

    en.wikipedia.org/wiki/Toyota_R_engine

    R. 1953 Toyota R engine. The 1.5 L (1,453 cc) R family was produced from 1953 through 1964, and was originally manufactured at the Toyota Honsha plant . Bore and stroke was 77 mm × 78 mm (3.03 in × 3.07 in). [1] In common with new engines of the time, it was made from cast iron (both the block and the head), water cooled, used a three bearing ...

  4. Wrench size - Wikipedia

    en.wikipedia.org/wiki/Wrench_size

    Sizes that may interchange, depending on the precision needed, include 2 mm (close to 5 ⁄ 64 inch (1.98 mm)), 4 mm (close to 5 ⁄ 32 inch (3.97 mm)) and 8 mm (close to 5 ⁄ 16 inch (7.94 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.

  5. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Schematic of a machine tap. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter.. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

  6. Worm drive - Wikipedia

    en.wikipedia.org/wiki/Worm_drive

    Therefore, regardless of the worm's size (sensible engineering limits notwithstanding), the gear ratio is the "size of the worm wheel - to - 1". Given a single-start worm, a 20-tooth worm wheel reduces the speed by the ratio of 20:1. With spur gears, a gear of 12 teeth must match with a 240-tooth gear to achieve the same 20:1 ratio.

  7. Anzio 20mm rifle - Wikipedia

    en.wikipedia.org/wiki/Anzio_20mm_rifle

    4,572 meters (15,000 ft; 2.841 mi) [1] Feed system. 3-round detachable box magazine. The Anzio 20mm rifle [1] is an American anti-materiel rifle designed and marketed by Anzio Iron Works. It is the first American anti-materiel rifle designed and mass-produced for public sale with a bore diameter in excess of .50 caliber in over 80 years. [2]

  8. PGM Hécate II - Wikipedia

    en.wikipedia.org/wiki/PGM_Hécate_II

    Sights. Telescopic sights. The Hécate II is the standard heavy sniper rifle and anti-materiel rifle of the French Army, sometimes known as the FR-12.7 ( French: Fusil à Répétition de calibre 12.7 mm or "12.7 mm calibre repeating rifle"). It is manufactured by PGM Précision of France. This is the largest weapon manufactured by PGM ...

  9. Blowback (firearms) - Wikipedia

    en.wikipedia.org/wiki/Blowback_(firearms)

    With these angles the geometrical transmission ratio of the bolt carrier to the bolthead became 3:1, so the rear bolt carrier was forced to move 3 times faster than the bolthead. The rearward forces on the bolt carrier and receiver were 2:1.

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