Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 387M4 found under Ring Retaining by Diamond Reo Truck Co. The National Stock Number assigned to this part is 5325007521285, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 387M4.