Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 673996 found under Washer Seal by Spicer Heavy Axle And Brake Inc. The National Stock Number assigned to this part is 5310015687358, 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 673996.