Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ANSI B74.18 found under Stone Sharpening by American National Standards Inst. The National Stock Number assigned to this part is 5345002475948, 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 ANSI B74.18.