Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11-491-180-00 3 found under Catch by Ahearn And Soper Co Inc. The National Stock Number assigned to this part is 5342011091217, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 11-491-180-00 3.