Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NN40-J45 found under Stone Set Honing by Sunnen Products Company. The National Stock Number assigned to this part is 5345012678582, and the Federal Supply Class is 5345 Disks And Stones Abrasive. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NN40-J45.