Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FCR-51-3 8 found under Valve Calibrated Flow by Brand Hydraulics. The National Stock Number assigned to this part is 4820012959558, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FCR-51-3 8.