Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SLW40442M20BP found under Washer Key by Alkan. The National Stock Number assigned to this part is 5310013910469, 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 SLW40442M20BP.