AXLE NUT USES COTTOR KEY. FITS Z50A'S 1968-78 AND CT70'S 1969-76.
COTTER_PIN 3MM_X_45MM BRAKE_PEDAL RETAINER AXLE_NUT_RETAINER 7/17A ( XR5_138 )
This pin is used on a lot of different Hondas to help hold the brake pedal on the shaft that it pivots on.
This pin is also used on a lot of axle nuts. All ATC 70s 90s and 110'S for sure use this.