Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18363A found under Clip Spring Chain by Hercules Engine Co Inc. The National Stock Number assigned to this part is 3020002734066, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 18363A.