Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AT256SS found under Riveting Machine Squeeze Type Pn by Snap On Incorporated. The National Stock Number assigned to this part is 3448005591433, and the Federal Supply Class is 3448 Riveting Machines. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AT256SS.