Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B12-257R found under Blade Circular Saw Woodcutting by Ingersoll Rand Corp. The National Stock Number assigned to this part is 3230015427389, and the Federal Supply Class is 3230 Tools Attachments For Woodwork Machinery. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B12-257R.