Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8373-19 found under Washer Seal by Cef Industries Inc. The National Stock Number assigned to this part is 5310015595957, 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 8373-19.