Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W211 16-42 found under Washer Flat by Rolls Royce Marine As Avd Norwinch. The National Stock Number assigned to this part is 5310251502008, 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 W211 16-42.