Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WM77B-117830 found under by General Sheet Metal Co. The National Stock Number assigned to this part is 2520010734118, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like WM77B-117830.