Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FS-B4012-01 found under Processor File Server by Siemens Industry Inc. The National Stock Number assigned to this part is 7025015344090, and the Federal Supply Class is 7025 Adp Input Output And Storage Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FS-B4012-01.