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2. 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).

3. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Below is a comprehensive drill and tap size chart for all drills and taps: Inch, 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.

4. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20 mm size screws. [84] Its primary advantage is its ability to resist cam-out , so it is used in high-torque applications, such as tamper-proof lug nuts , cylinder head bolts, and other engine bolts.

5. Width across flats - Wikipedia

   en.wikipedia.org/wiki/Width_across_flats

   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.

6. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   11 ⁄ 32 in (8.7313 mm) drill bits - long-series morse, ... A core drill bit may be used to double the size of a hole. ... An 1/8 inch left-hand drill bit.

7. Meccano - Wikipedia

   en.wikipedia.org/wiki/Meccano

   What has remained the same during all these years is the Imperial 1 ⁄ 2 inch (12.7 mm) perforation spacing and the 5 ⁄ 32 inch (4.0 mm) inch whitworth thread for nuts and bolts (and other threaded parts). These unchanged standards and complete interchangeability of parts results in many modern models functioning perfectly with Meccano ...