Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M66-137A found under by Siemens Telecomunicazioni Spa. The National Stock Number assigned to this part is 5940002319647, and the Federal Supply Class is 5940 Lugs Terminals And Terminal Strips. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M66-137A.