Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28NP0 found under Washer Lock by Bunn B H Co Inc. The National Stock Number assigned to this part is 5310009148203, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 28NP0.