Quote:
Originally Posted by Johnmed
Mental isn’t it!
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Yep, that's what happens when you have a standard, and then change it but not every one follows.
The only one I know of is BA that has a fixed relationship factor of 1.75
Metric are common ISO sizes from around 1985 mostly the same as DIN standard, but from 1992 onwards ISO/ANSI have recommendations for some head sizes to be reduced, but not everyone followed. You may find some M10 with 16mm AF instead of 17mm and as you found out an M12 with 18mm AF.
19th February 2018, 04:41 PM
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