Bolt torque is normally determined by the size and material type of the fastener, and the material it is threaded into. Can't do that with propellers because you have a hub composition/compression issue. A wood prop normally has a softer hub than a composite prop. Or at least should. One manufacturer found the previous out the hard way when they suggested a screw torque value in excess of 100 inch pounds for wood props with one of their engines. Crushed a lot of wood hubs...

Wood props can achieve maximum clamping force somewhere between 40 and 60 inch pounds, depending on the fastener, engine size, and hub density. Carbon props should achieve max clamping force in the area of 65 inch pounds. Their hubs permit greater screw torque without deforming the hub. Never exceed a fastener's maximum suggested torque value. From 60cc and down, 40-45 inch pounds works for both wood and composite props.

The link in the previous post cannot be accessed because it has been blocked by the administrator as "forbidden weapons". Seems the Second Amendment is not viewed kindly here. A standard inch pound torque wrench and 1/4"-3" drive hex keys works for everything that uses a multi bolt hub and allen head cap screws.

Pe:

Based on known usual hub compositions, we're talking about the same manufacturer. I will not post the makers name because it was a custom blade product.