Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number N-LAK18 (729542 found under Lens Optical Instrument by Glassfab Inc. The National Stock Number assigned to this part is 6650015215895, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like N-LAK18 (729542.