Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 644627107 found under Disc Brake by Duffnorton Co Inc. The National Stock Number assigned to this part is 3040011523015, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 644627107.