Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SYL31 found under Lamp Cartridge by Osram Sylvania Inc. The National Stock Number assigned to this part is 6240013119751, 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 SYL31.