Z72 B 9 Tooth Sprocket 12mm ID two set screws Counter Bore No keyway.
This has a counter bore that is .31" deep x .72" OD so a 13mm Socket will fit in the counter bore.
Use the two set screws to hold in place. The counter bore also allows you to use the nylon nut.
Fits the Unite Motor Model: MY1020 Voltage: 36VDC Rated speed: 2,250 rpm's Rated current: 13.0 Amps Output: 350 Watts with the 12mm OD Shaft.
Use Z72 Chain with 1/2" pitch x 3/32" width also can be used with 1/2" x 1/8" chain.