Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6503 CENTRAL found under Square Combination by Kipper Tool Company. The National Stock Number assigned to this part is 5210014356916, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6503 CENTRAL.