Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6240-99-9959122 found under Lamp Filament by Nato Stock Number Assigned By An. The National Stock Number assigned to this part is 6240004483052, 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 6240-99-9959122.