On Mon, 24 Aug 2015 18:27:42 -0700 (PDT), firstname.lastname@example.org wrote:
Not necessarily true. Metric bolt head size differs depending on the
standard - JIS, DIN,ISO or ANSI/ ISO or DIN/ISO.
A 10mm DIN uses 17mm, while ISO uses 16 and JIS uses 14mm. That's why
tool kits for European, Japanese, and American vehicles etc contain
different assortments of wrenches.
Only JIS (Japanese standard) uses 12mm and only DIN specific sets have
an 11mm (used on DIN 7mm bolts - no other standard even HAS a 7mm
bolt) Same for a 27mm wrench and 18mm bolt.
American vehicles tend to use DIN/ISO, so 11mm (same as 7/16) is
included in american sets for use on some 6mm bolts ---
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