Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FX3521 found under Lamp Incandescent by Pauluhn Electric Manufacturing Llp. The National Stock Number assigned to this part is 6240016102938, 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 FX3521.