Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KSSB20-18 found under Bearing Plain Self by Dover Engineered Systems Inc. The National Stock Number assigned to this part is 3120001219450, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KSSB20-18.