Haydon Kerk Pittman (AMETEK, USA) G51A is a Ø51 mm spur gearbox with stock ratios 5.9:1-4,732.5:1 in a compact 34.9-38.8 mm length, max load 1.236 Nm (175 oz-in) standard or 2.118 Nm (300 oz-in) in the HT high-torque version, efficiency 0.48-0.81 and weight 167.3-231.9 g; the very high ratios serve heavy low-speed joints, rotary tables and winding mechanisms when paired with Pittman DC/BLDC motors.
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