ISO 4753:2011 Preview
Fasteners -- Ends of parts with external ISO metric thread
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
ISO 4753:2011 specifies the form and dimensions of ends of parts with external ISO metric screw thread (e.g. bolt, screw and stud ends) recommended for use. They apply to standardized or non-standardized threaded parts.
For each end type, a symbol is specified and it is intended that these symbols be used when specifying one of the ends for threaded fasteners.