Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TH31-963(28 found under Lamp Incandescent by Campk Components. The National Stock Number assigned to this part is 6240011869751, 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 TH31-963(28.