Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 424H1 found under Lamp Incandescent by Otis Elevator Co. The National Stock Number assigned to this part is 6240004562578, and the Federal Supply Class is 6240 Electric Lamps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 424H1.