The bolt-on style prop adapters that come with the Cobra motors are machined from very durable 7075 grade aluminum stock, so they will last quite a long time. However, every so often on a "Not so Perfect" landing you may bend one. For those cases we offer these replacement prop adapters.
The Cobra 41mm Extra-Long Bolt-On Prop Adapter is designed to fit all of the original series Cobra 4120 and 4130 size motors that had 3 cooling holes on the front end. Included with each prop adapter is a prop washer and nut, along with 3 new screws to mount the prop adapter to your motor.
The Extra-Long Prop Adapter is designed to be used in applications where you are using a prop with a thicker than normal hub along with a plastic spinner with a thick backplate. In these unique applications, the stock prop adapter is just not long enough.
The prop adapter has a metric M8x1.25mm thread, and has a threaded shaft which is 41mm in length, 12mm longer than the stock prop adapter. With the included prop washer and nut, this prop adapter will fit props with hub thicknesses ranging from 8.5mm to 31mm or from 3/8 inch to 1-1/4 inches.
For more information about this product and the rest of the Cobra Motors product line, please check out the Cobra Brushless Motors web site.