Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 312-000-205 found under Nrp Beam Expander A by Santa Barbara Infraredinc. The National Stock Number assigned to this part is 4920016138193, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 312-000-205.