This gearmotor is a powerful brushed DC motor with 18.75:1 metal gearbox intended for operation at 12 V. The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. Measuring 37 mm (1.46″) in diameter, these brushed DC gearmotors are the largest and most powerful we carry. They are available in a range of gear ratios from 6.3:1 to 150:1 and with 12 V or 24 V motors, and all versions are available with integrated 64 CPR quadrature encoders on the motor shafts. The 12 V and 24 V motors offer approximately the same performance at their respective nominal voltages, with the 24 V motor drawing half the current of the 12 V motor. See the 37D metal gearmotor datasheet (2MB pdf) for more information, including detailed performance graphs for each gearmotor version. You can also use our dynamically sortable 37D gearmotor comparison table to search for the version that offers the best combination of speed, torque, and current draw for your particular application. A more basic comparison table is available below. RatedVoltage StallCurrent No-LoadCurrent Gear Ratio No-Load Speed(RPM) ExtrapolatedStall Torque Max Power(W) Without Encoder With Encoder (kg ⋅ cm) (oz ⋅ in) 12 V 5.5 A 0.2 A 1:1 (no gearbox) 10,000 0.5 7 – – item #4750 6.3:1 1600 3.0 42 12 item #4747 item #4757 10:1 1000 4.9 68 12 item #4748 item #4758 19:1 530 8.5 120 12 item #4741 item #4751 30:1 330 14 190 12 item #4742 item #4752 50:1 200 21 290 10 item #4743 item #4753 70:1 150 27 380 10* item #4744 item #4754 100:1 100 34 470 8* item #4745 item #4755 131:1 76 45 630 6* item #4746 item #4756 150:1 67 49 680 6* item #2829 item #2828 24 V 3 A 0.1 A 1:1 (no gearbox) 10,000 0.55 8 – – item #4690 6.3:1 1600 3.5 49 14 item #4688 item #4698 10:1 1000 5.5 76 14 item #4689 item #4699 19:1 530 9.5 130 13 item #4681 item #4691 30:1 330 15 210 13 item #4682 item #4692 50:1 200 23 320 12 item #4683 item #4693 70:1 140 31 430 10* item #4684 item #4694 100:1 100 39 540 8* item #4685 item #4695 131:1 79 47 650 6* item #4686 item #4696 150:1 68 56 780 6* item #4687 item #4697 * Output power for these units is constrained by gearbox load limits; spec provided is output power at max recommended load of 10 kg⋅cm. Note: The listed stall torques and currents are theoretical extrapolations; units will typically stall well before these points as the motors heat up. Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The recommended upper limit for continuously applied loads is 10 kg-cm (150 oz-in), and the recommended upper limit for instantaneous torque is 25 kg-cm (350 oz-in). Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes; a general recommendation for brushed DC motor operation is 25% or less of the stall current. In general, these kinds of motors can run at voltages above and below the nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. The gearboxes are composed mainly of spur gears, but they feature helical gears for the first stage for reduced noise and improved efficiency: 37D Gearmotor (Helical Pinion) with the gearbox removed showing the helical pinion gear and first mating gear. Details for item #4741 This gearmotor is a powerful brushed DC motor with 18.75:1 metal gearbox intended for operation at 12 V. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available with an integrated encoder. Key specifications: voltage no-load performance stall extrapolation 12 V 530 RPM, 200 mA 8.5 kg⋅cm (120 oz⋅in), 5.5 A Exact gear ratio: 25×30×3010×10×12=18.75:125×30×3010×10×12=18.75:1 Dimensions Dimensions of the 37D metal gearmotors (without encoders). Units are mm over [inches]. Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no more than 3mm (0.12″) into the screw hole.
