Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H42409-6-A06 found under Washer Flat by John Crane Inc. The National Stock Number assigned to this part is 5310013245766, 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 H42409-6-A06.