Shaft tapers
Hello Marco,The taper used on your vessel is a 1:10 Italia taper. All you need to do is to let the sales person you are dealing with know that you have Beneteau 351 with a 25mm shaft. Max-Prop will provide the correct taper bored to the props hub based on the vessel's make model and shaft diameter. The only time a person needs to go to the trouble of measuring a taper is when the vessel was produced in country’s that do not have a shaft taper standards, like Taiwan. Hope this helps Kevin.