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2. Width across flats - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ⁄ 32 inch (3.97 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.

3. Propane, butane, and LPG container valve connections

   en.wikipedia.org/wiki/Propane,_butane,_and_LPG...

   Quick coupling 21 mm (G.53) EN 15202 21 mm 0.827" No thread INT Quick coupling 21.7 mm threaded (G.57) EN 15202 21.7 mm 0.858" No thread Quick coupling 22 mm (G.54) EN 15202 22 mm 0.866 No thread Quick coupling 24.4 mm (G.58) EN 15202 24.4 mm 1" No thread Quick coupling 24.5 mm (G.55) EN 15202 24.5 mm 1" No thread

4. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   The major minus pitch also works for inch-based threads, but you must first determine the pitch by looking at the number of treads per inch (TPI; for example, 1 ⁄ 20 = 0.050 and 1 ⁄ 13 ≈ 0.077), and your result will only land near a tap drill size (not directly on one). Example (inch coarse): For 7 ⁄ 16-14, 1 in ÷ 14 = 0.071 in; 0.437 ...

5. Preferred metric sizes - Wikipedia

   en.wikipedia.org/wiki/Preferred_metric_sizes

   For each size bolt or screw and type of head, there is a corresponding size driver prescribed by various ISO standards, including: Internal hex drive: ISO 2936:2014 "Assembly tools for screws and nuts—Hexagon socket screw keys" [5] External hex drive: ISO 4014, 4016, 4017, and 4018 [6]

6. Lug nut - Wikipedia

   en.wikipedia.org/wiki/Lug_nut

   The tool size needed for removal and installation depends on the type of lug nut. The three most common hex sizes for lug nuts are 17 mm, 19 mm, and 21 mm, while 22 mm, 23 mm, 11 ⁄ 16 inch (17.5 mm), and 13 ⁄ 16 inch (20.6 mm) are less commonly used.

7. Socket wrench - Wikipedia

   en.wikipedia.org/wiki/Socket_wrench

   These drive fittings come in four common sizes: 1 ⁄ 4 inch, 3 ⁄ 8 inch, 1 ⁄ 2 inch, and 3 ⁄ 4 inch (referred to as "drives", as in "3 ⁄ 8 drive"). Despite being denominated in inches, these are trade names ( common product name ), and manufacturers construct them to 6.3 mm, 9.5 mm, 12.5 mm and 19 mm, having been rounded to a ...