Imao’s sprockets are available from a wide variety of materials and sizes.

SIS: Steel Idle Sprockets
・ Heavy-duty
・ Stable rotation with moulded-in ball bearing
・ Steel body with induction hardened teeth top for high wear resistance
・ Applicable to chain No. 35, 40, 50, 60, 80
・ For 10mm, 12mm, 15mm, 20mm diameter spindle
Use with PID Idler Pins.

Materials:
Sprocket body: S45C Steel, Induction hardened teeth top, Black oxide finish
Bearing: Steel

Datasheet: https://www.imao.co.jp/files/on-cat/pdf/en/sis-e.pdf

Parameter Name	Parameter Value
Teeth	straight-toothed
Other characteristics	for chains steel with ball bearing
Diameter (mm)	49 - 98