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It is a self-locking (or self holding) taper of approximately 5/8" per foot [3] that allows the torque to be transferred to the drill bit by the friction between the taper shank and the socket. The tang at the end of the taper provides a positive drive of the drill when the taper fails to grip. [ 4 ]
Machine tool operators must be able to install or remove tool bits quickly and ... 8: 2.5: 6.5: 11.9: 1° 29' 15" ... It can replace conventional square or round ...
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).
Example (inch, fine): For 7 ⁄ 16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).
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Two spanners, both nominal size 5 ⁄ 8 in, with a diagram superimposed to show the logic that allows them both to be nominal size 5 ⁄ 8 in when their actual sizes are clearly different (across-flats distance vs screw diameter). The across-flats definition is the common standard today, and has been for many decades.