Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 145D0123-1 found under Locknut Transmissio by Mcmellon Bros Incorporated. The National Stock Number assigned to this part is 1615011130244, and the Federal Supply Class is 1615 Helicopter Rotor Blades Drive Mechanisms And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 145D0123-1.