Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BDN-1-7D PIECE 30 found under Disk Meter by Singer Co The. The National Stock Number assigned to this part is 6680012929666, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BDN-1-7D PIECE 30.