Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AKS4-420-165B found under Insertscrew Thread by Avk Industries Products Inc. The National Stock Number assigned to this part is 5325016972913, 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 AKS4-420-165B.