Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Z11MC4D52-1 found under Coupling Set by Zurn Industries Inc. The National Stock Number assigned to this part is 1615009389994, 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 Z11MC4D52-1.