Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P28-J63 found under Stone And Holder Cylinder Hone by Sunnen Products Company. The National Stock Number assigned to this part is 3460010264781, and the Federal Supply Class is 3460 Machine Tool Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P28-J63.