Overview • The FANUC M-900iB/400L is the long arm variant of the heavy payload M-900iB series, an articulated six-axis robot rated at 400 kg at the wrist with a 3704 mm reach. • Its 3150 kg structure carries the extended arm without sacrificing stiffness, which is what allows a 400 kg payload robot to lift a complete car body panel or a large welded structure at the far end of the envelope. • The extra arm length is the main difference from the M-900iB/700: reach grows from