Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CA2021 21B found under Post Snap Fastener by Alcoa Global Fasteners Inc. The National Stock Number assigned to this part is 5325014359346, 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 CA2021 21B.