Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JM1931-107-40 found under Roller Carriage by Otis Elevator Co. The National Stock Number assigned to this part is 3960003182992, and the Federal Supply Class is 3960 Freight Elevators. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like JM1931-107-40.