Pololu 19:1 Metal Gearmotor 37Dx52L mm (Helical Pinion)

SKU: POLOLU-4741 Brand: Pololu
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. This gearmotor is also available with an integrated encoder.
$55.95 AUD, inc GST
$50.86 AUD, exc GST

Available with a lead time
Expect dispatch between Nov 18 and Nov 20

Quantity Discounts:

  • 6-12 $49.34 (exc GST)
  • 12+ $48.32 (exc GST)
- +

0 from local stock, 1 supplier stock; your order will dispatch between Dec 1 to Dec 10. And yes, stock levels and lead times are accurate!

Shipping:

  • $7+ Standard (5+ days*, tracked)
  • $11+ Express (2+ days*, tracked)
  • FREE Pickup (Newcastle only - must order online*)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

Measuring 37 mm (1.46") in diameter, these brushed DC gearmotors are the largest and most powerful Pololu 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 Pololu's 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.

Rated
Voltage
Stall
Current
No-Load
Current
Gear Ratio No-Load Speed
(RPM)
Extrapolated
Stall 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=18.75:125×30×3010×10×12=18.75:1

Dimensions

Dimensions of the 37D metal gearmotors (without encoders). Units are mm over [inches].

This diagram is also available as a downloadable PDF (459k pdf).

Warning: Do not screw too far into the mounting holes as the screws can hit the gears. Pololu recommend screwing no more than 3mm (0.12") into the screw hole.

Gearmotor accessories

The face plate has six mounting holes evenly spaced around the outer edge threaded for M3 screws. These mounting holes form a regular hexagon and the centers of neighboring holes are 15.5 mm apart. Pololu carry two brackets for these gearmotors: a stamped aluminum L-bracket (sold in pairs) and a sturdier, tombstone-style machined aluminum bracket (sold individually):

37D mm gearmotor (without encoder) with L-bracket and 6mm universal mounting hub.

Pololu machined aluminum bracket for 37D mm metal gearmotors mounting a motor to a clear piece of acrylic.

The 6 mm diameter gearbox output shaft works with the Pololu universal aluminum mounting hub for 6mm shafts, which can be used to mount Pololu's larger Pololu wheels (80mm- and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft as shown in the left picture below. Alternatively, you could use Pololu's 6mm scooter wheel adapter to mount many common scooter, skateboard, and inline skate wheels to the gearmotor’s output shaft as shown in the right picture below:

Black Pololu Wheel 90×10mm on a Pololu 37D mm Metal Gearmotor.

A 37D mm gearmotor connected to a scooter wheel by the 6 mm scooter wheel adapter.

For a general-purpose hex adapter, consider Pololu's 12mm hex wheel adapter (also available in an extended version), which lets you use these motors with many common hobby RC wheels, including Dagu Wild Thumper Wheels:

12mm Hex Wheel Adapter for 6mm Shaft connecting a Wild Thumper Wheel to a 37D mm Metal Gearmotor.

Pololu have a number of motor drivers and motor controllers that work with these 37D mm metal gearmotors. Pololu generally recommend Pololu's High-Power Motor Drivers, which are available in various power levels and versions, including some dual-channel shields for Arduino and dual-channel expansion boards for Raspberry Pi. Additionally, Pololu's VNH5019-based motor drivers, which are also available as single and dual carriers, are a good match for these gearmotors.

Pololu Dual G2 High-Power Motor Driver 24v14 Shield for Arduino.

Pololu Dual G2 High-Power Motor Driver 24v14 for Raspberry Pi (assembled version) with included hardware.

Pololu dual VNH5019 motor driver shield for Arduino.

If you are looking for higher-level control interfaces, such as USB, RC, analog voltages, I²C, or TTL serial, consider Pololu's Simple Motor Controllers, Jrk motor controllers, or RoboClaw motor controllers; these controllers are available in various power levels several of which can handle these 37D mm metal gearmotors (we generally recommend a motor controller that can handle continuous currents above the stall current of your motor).

High-Power Simple Motor Controller G2 18v15.

Jrk G2 21v3 USB Motor Controller with Feedback.

RoboClaw 2×7A Motor Controller (V5B) in its included case.

Pololu have an assortment of Hall effect-based current sensors to choose from for those who need to monitor motor current:

ACS711EX current sensor carrier -15.5A to +15.5A.

ACS714 current sensor carrier -5A to +5A.

Selecting the Right Gearmotor

Pololu offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Pololu's metal gearmotor comparison table can help you find the motor that best meets your project’s requirements.

People often buy this product together with:

Pololu Universal Aluminum Mounting Hub for 6mm Shaft, #4-40 Holes (2-Pack)Pololu Universal Aluminum Mounting Hub for 6mm Shaft, #4-40 Holes (2-Pack)
Pololu Stamped Aluminum L-Bracket Pair for 37D mm Metal GearmotorsPololu Stamped Aluminum L-Bracket Pair for 37D mm Metal Gearmotors
Pololu Simple Motor Controller 18v7 (Fully Assembled)Pololu Simple Motor Controller 18v7 (Fully Assembled)

Dimensions

Size: 37D × 52L mm1
Weight: 185 g
Shaft diameter: 6 mm2

General specifications

Gear ratio: 18.75:1
No-load speed @ 12V: 530 rpm
No-load current @ 12V: 0.2 A
Stall current @ 12V: 5.5 A3
Stall torque @ 12V: 8.5 kg·cm3
Max output power @ 12V: 12 W
No-load speed @ 6V: 270 rpm4
No-load current @ 6V: 0.15 A4
Stall current @ 6V: 3.0 A4
Stall torque @ 6V: 5.0 kg·cm4
Motor type: 12V

Performance at maximum efficiency

Max efficiency @ 12V: 55 %
Speed at max efficiency: 470 rpm
Torque at max efficiency: 1.0 kg·cm
Current at max efficiency: 0.76 A
Output power at max efficiency: 5.0 W

General specifications

Encoders?: N

Notes:

1
Length measurement is from gearbox face plate to back of motor (it does not include the output shaft or motor terminals). See dimension diagram for details.
2
D shaft.
3
Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
4
This motor will run at 6 V but is intended for operation at 12 V.

File downloads

Recommended links

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

  • $3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
  • $7+ for Standard Post (typically 6+ business days, tracked)
  • $11+ for Express Post (typically 2+ business days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $12+ for Pack and Track (3+ days, tracked)
  • $16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!

Write Your Own Review

Videos

View All

Guides

Servos, Steppers or Solenoids? | Choosing an Actuator to Move Your Project

In this guide, we go over some common ways of adding motion to your project with actuators such as ...
In this guide, we go over some common ways of adding motion to your project with actuators such as ...

How To Control A Motor with the Raspberry Pi

In this tutorial, we are going to connect a Motor to the Raspberry Pi and create a hypnotic self-spi...
In this tutorial, we are going to connect a Motor to the Raspberry Pi and create a hypnotic self-spi...

The Maker Revolution

The Maker Revolution celebrates the creation of new devices and the modification of existing ones - ...
The Maker Revolution celebrates the creation of new devices and the modification of existing ones - ...

Motor Drivers vs. Motor Controllers

If you’ve ever built a robot with wheels, or any motorised parts really, you’ll have com...
If you’ve ever built a robot with wheels, or any motorised parts really, you’ll have com...

Projects

Micro:bit based GlowBit Car

I made this car because at school there was a Lego We-Do tug-of-war competition but the cars only d...
I made this car because at school there was a Lego We-Do tug-of-war competition but the cars only d...

Mini Desk Vacuum

Chances are if you are anything like me, being a maker is often an excuse to create as big of a mess...
Chances are if you are anything like me, being a maker is often an excuse to create as big of a mess...

DIY Pi Buggy

The motivation behind this project came from a robotics and engineering club that I've been going to...
The motivation behind this project came from a robotics and engineering club that I've been going to...
Feedback

Please continue if you would like to leave feedback for any of these topics:

  • Website features/issues
  • Content errors/improvements
  • Missing products/categories
  • Product assignments to categories
  • Search results relevance

For all other inquiries (orders status, stock levels, etc), please contact our support team for quick assistance.

Note: click continue and a draft email will be opened to edit. If you don't have an email client on your device, then send a message via the chat icon on the bottom left of our website.

Makers love reviews as much as you do, please follow this link to review the products you have purchased.