Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MX40A found under Caliper Assembly Di by The Hilliard Corporation. The National Stock Number assigned to this part is 3040014817658, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MX40A.