Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2521-F found under Splicer Fiber Optics Conductor by 3 M Federal Systems Dept. The National Stock Number assigned to this part is 6060014542402, and the Federal Supply Class is 6060 Fiber Optic Interconnectors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2521-F.