Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ALS4-428-165 found under Insert Screw Thread by Alcoa Fastening Systems Ltd. The National Stock Number assigned to this part is 5325015755523, 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 ALS4-428-165.