... installation 2.low noise,high precision, big torque and long life helical gear boxes R series helical gear boxes,gear ... reducer,gear boxSpecificationsLOW NOISE, HIGH PRECISION, BIG TORQUE AND LONG ... TRANSMISSION RATIO AT A LOW OUTPUT ROTATIONAL SPEEDLOW NOISE, HIGH PRECISION, BIG TORQUE AND LONG LIFEWORKING ENVIRONMENTWORKING TEMPERATURE: -40° ...