Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12X-198 found under Washerlock by Prestolite Electric Inc. The National Stock Number assigned to this part is 5310016753803, 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 12X-198.