Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 452 021 01 found under Sleeve Seal Seat by Rolls Royce Marine North America. The National Stock Number assigned to this part is 5365016020701, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 452 021 01.