Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XSM-5-178X found under Parts Kit Universal by Blue Tee Corp. The National Stock Number assigned to this part is 2520013687974, 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 XSM-5-178X.