Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 666123 found under Shaft Assembly by Gould Instrument Systems Inc. The National Stock Number assigned to this part is 3040011808426, 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 666123.