Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QB99503-2 found under Capacitor Fixed Pla by Honeywell Intl Inc. The National Stock Number assigned to this part is 5910004041931, and the Federal Supply Class is 5910 Capacitors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like QB99503-2.