This Adapter is Designed Specifically for the YS-140DZ, YS-160DZ and Especially the Big YS-170DZ. These new motors have a "Longer Prop Shaft" and do not need the short shaft kit.
This Double Jam Nut Kit #TT-0809-A includes a larger 1-1/4' Dia. Prop Washer for the Big Props.
This Adapter will work well on other applications requiring the 8x1.0mm Threaded Shaft.
8x1.0mm LONG SHAFT DOUBLE JAM NUT Adapter Kit