Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21276-10523 found under Insert Screw Thread by Selex Es Limited. The National Stock Number assigned to this part is 5325004119105, 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 21276-10523.