Titanium Axle Nut. Machined with captive washer in grade 5 Titanium. This item fits many models of Aprilia as a wheel and/or swingarm axle Nut. It is highly corrosion resistant and an incredible 40% lighter than steel original! Listed in model specific bike sections where fitment has been established. Please note the colour finish on Titanium is not identical to our Aluminium range.