This document defines the dimensions and tolerances of the elements for fixing bracelets using spring bars. It also defines the dimensions and tolerances of the bracelets in terms of their attachment to the watch case.
NF S86-625:2017 history
2017NF S86-625:2017 Horlogerie - Bracelets et boîtes de montres - Dimensions de raccordement
1993NF S86-625:1993 Horlogy. Wristwatch cases. Dimensions of fastening elements for bracelets