40 inch pounds for prop torque. Most people do not realize they are seriously over torquing the prop bolts. Most prop bolts are one of the following sizes: 8-32, 10-32, and 5mm. McMaster-Carr sells some very nice 1/4" drive, short allen key sockets in the right sizes. [link]http://www.mcmaster.com[/link] You get to do your own search for the product, but the link will get you started. Then locate a 1/4" drive inch pound torque wrench somewhere. Harbor Freight frequently sells them for about $20.00.

Please don't write that all that stuff costs too much. Tossing a prop in a hover or shearing off the bolts and having the hub repaired costs a lot more.