This standard specifies the interchangeable dimensions of propeller hubs and propeller shaft ends with a taper of 1:16 and shaft diameters from 20mm to 160mm installed on recreational and commercial inboard boats.
GB/T 19309-2003 history
2008GB/T 11699-2008 Small craft with inboard engine.Propeller shaft ends and bosses
2003GB/T 19309-2003 Small craft with inboard engine--Propeller shaft ends and bosses with 1:16taper
GB/T 19309-2003 Small craft with inboard engine--Propeller shaft ends and bosses with 1:16taper was changed to GB/T 11699-2008 Small craft with inboard engine.Propeller shaft ends and bosses.