Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 91S45-1-1AA found under Clinch Plate Turnbutton Fastener by Alcoa Fastening Systems Ltd. The National Stock Number assigned to this part is 5325011775951, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 91S45-1-1AA.