Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 900059 found under Ring Lock Serrated by Will Burt Company The. The National Stock Number assigned to this part is 5365016019533, 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 900059.