From Amazon
Bosch 1.1mm Saw Chain for AKE 40/AKE 40-17S / AKE 40-18S / AKE 40-19S Chainsaws
Powertool World
Bosch Green Replacement Saw Chain 40cm for AKE 40 / AKE 40-17S / AKE 40-18S F016800258
This product is also available at 1 unverified merchant.