- I am replacing my prop which I assume is the original 19x15 LH.
I have measured the shaft at 1.3/8" but the taper and keyway do not
conform to SAE standard measurements. SAE taper is 3.7/8" with a
5/16" keyway, whilst my taper measures 3.5" with a 3/8" keyway. Can
anyone shed any light on this? Did any of you have to custom bore or