Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4270 22R found under Cap Protective Dust And Moisture by 3M Company. The National Stock Number assigned to this part is 5340013040463, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4270 22R.