This standard specifies the dimensions for attaching watch straps to watch cases with spring-loaded strap pins. This standard applies to two types of watch cases and three types of spring watch strap pins.
ISO 286-1 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits; Technical Corrigendum 1*, 2013-08-01 Update
GB/T 4048-2008 history
2008GB/T 4048-2008 Timekeeping instruments.Wristwaches.Dimensions of bracelet-to-case fastening elements
1983GB/T 4048-1983 Wristwatch cases--Dimensions of fastening elements for bracelets