Gearmotor with bracket and hub.

Gearmotor Dimensions:

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. You can use our custom-designed 37D metal gearmotor bracket (pictured to the right) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.

Please note that unlike our smaller metal gearmotors, these 37D mm gearmotors have output shafts with a diameter of 6 mm. The hub in the picture to the right can be used to mount custom wheels and mechanisms to the gearmotor’s output shaft.

The picture below shows the dimensions (in mm) of the 37D mm line of gearmotors. The value of X is 22 mm for the 19:1 37Dx52L mm and 29:1 37Dx52L mm versions, 24 mm for the 50:1 37Dx54L mm and 67:1 37Dx54L mm versions, and 26.5 mm for the 100:1 37Dx57L mm and 122:1 37Dx57L mm versions.

37D mm metal gearmotor dimensions (units in mm).

Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no further than 3mm (1/8") into the screw hole.

These motors are intended for use at 12 V, though the operational specs listed in the table below were measured at 6 V. At 12 V, the no-load RPM, stall current, and stall torque will all be approximately twice their 6V values. To see the motor specs for 12V operation, please see the short description at the top of this page.

19:1 metal gearmotor 37Dx52L mm next to a micro metal gearmotor for size comparison.

Specs for the metal gearmotors running at 6 V:

gearmotor	gear ratio	free-run RPM	free-run current	stall current	stall torque%22 (oz-in / kg-cm)	weight (oz / g)
5:1 Micro	5:1	2500	50 mA	360 mA	1 / 0.1	0.35 / 10
10:1 Micro	10:1	1300	40 mA	360 mA	2 / 0.2	0.35 / 10
30:1 Micro	30:1	440	40 mA	360 mA	4 / 0.3	0.35 / 10
50:1 Micro	50:1	250	40 mA	360 mA	6 / 0.4	0.35 / 10
100:1 Micro	100:1	120	40 mA	360 mA	10 / 0.7	0.35 / 10
150:1 Micro	150:1	85	40 mA	360 mA	15 / 1.1	0.35 / 10
210:1 Micro	210:1	60	40 mA	360 mA	19 / 1.3	0.35 / 10
250:1 Micro	250:1	50	30 mA	360 mA	22 / 1.6	0.35 / 10
298:1 Micro	298:1	45	30 mA	360 mA	25 / 1.8	0.35 / 10
5:1 Micro HP	5:1	6000	120 mA	1600 mA	2 / 0.1	0.35 / 10
10:1 Micro HP	10:1	3000	120 mA	1600 mA	4 / 0.3	0.35 / 10
30:1 Micro HP	30:1	1000	120 mA	1600 mA	8 / 0.6	0.35 / 10
50:1 Micro HP	50:1	625	100 mA	1600 mA	15 / 1.0	0.35 / 10
100:1 Micro HP	100:1	320	80 mA	1600 mA	25 / 1.8	0.35 / 10
150:1 Micro HP	150:1	200	70 mA	1600 mA	45 / 3.2	0.35 / 10
210:1 Micro HP	210:1	140	70 mA	1600 mA	65 / 4.7	0.35 / 10
250:1 Micro HP	250:1	120	70 mA	1600 mA	75 / 5.4	0.35 / 10
298:1 Micro HP	298:1	100	70 mA	1600 mA	90 / 6.5	0.35 / 10
24:1 Mini	24:1	410	70 mA	420 mA	4 / 0.3	0.80 / 27
100:1 Mini	100:1	140	90 mA	800 mA	15 / 1.0	0.80 / 27
35:1 Mini	35:1	350	70 mA	1500 mA	35 / 2.5	0.80 / 27
25:1 20Dx42L mm LP	25:1	470	60 mA	580 mA	7 / 0.5	1.70 / 48
25:1 20Dx44L mm	25:1	500	250 mA	3300 mA	40 / 2.9	1.70 / 48
67:1 20Dx45L mm	67:1	210	250 mA	3300 mA	57 / 4.1	1.80 / 51
154:1 20Dx47L mm	154:1	90	250 mA	3300 mA	122 / 8.8	1.85 / 52
19:1 37Dx52L mm	19:1	256	250 mA	2500 mA	40 / 2.9	6.40 / 180
29:1 37Dx52L mm	29:1	175	250 mA	2500 mA	55 / 4	6.40 / 180
50:1 37Dx54L mm	50:1	101	250 mA	2500 mA	85 / 6	6.60 / 187
67:1 37Dx54L mm	67:1	75	250 mA	2500 mA	100 / 7	6.60 / 187
100:1 37Dx57L mm	100:1	50	250 mA	2500 mA	110 / 8	6.80 / 193
122:1 37Dx57L mm	122:1	41	250 mA	2500 mA	125 / 9	6.80 / 193

%22 The stall torque should only be considered a rough estimate.

People often buy this product together with:

Pololu Universal Aluminum Mounting Hub for 6mm Shaft Pair

Pololu 37D mm Metal Gearmotor Bracket Pair