Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S12-10-1007 found under Washer Key by Sikorsky Aircraft Corporation. The National Stock Number assigned to this part is 5310005213771, 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 S12-10-1007.