Mercury - Quicksilver Prop Nut Propeller Hardware Hardened Brass 161472. Overview. Every bit of power your engine makes depends on one small connection - the prop nut. The Mercury Marine 161472 Quicksilver Prop Nut keeps your propeller locked in tight, transferring all that torque to the water where it belongs. Made from hardened marine-grade brass, it's designed to handle years of vibration, pressure, and exposure without loosening or corroding. Simple as it is, this little part holds everythin