Type	GM11	GM12	GM13	GM14	GM15	GM16	GM17	GM18	GM19	GM20
Voltage (V)	4-6-12	6-12	12-24	12-24	12-24	12-24	24	12-24	12-24	12-24
Reductions	10÷392	12÷1470	10÷90	10÷90	15÷630	30÷630	30÷625	30÷625	3÷625	4÷625
Nominal Torque (Ncm)	20	50	15	25	100	100	300	250	300	900
Speed (Without load) RPM	255÷6	220÷1.8	315÷37	660÷75	440÷10	110÷5	1360÷8	2040÷11	1100÷6.4	1024÷6.7
Speed (Nominal Torque) RPM	165÷4	155÷1.6	220÷30	460÷62	300÷9	70÷4.5	880÷7.5	1340÷8.5	770÷6	640÷6.3
Dia. (mm)	27	34	30	30	39.6	39.6	40.5	30	40.5	42
Specifications

GM Gear Motors – Quick Selection Table

Series	Size & Weight	Torque Range	Key Features	Best For
GM11 / GM12	Ultra-compact, 40–55g	10–50 Ncm	Precious metal brushes, low noise	Robotics, medical devices, instruments
GM13 / GM14	Small/medium, ~100g	10–90 Ncm	Balanced torque/speed, robust	Automation, actuators, positioning
GM15 / GM16	Medium, 190g	30–630 Ncm	Higher load capacity, reliable	Pumps, conveyors, robotic joints
GM18	Compact planetary, 85g	60–625 Ncm	Planetary gear, high torque density	Heavy robotics
GM20	Larger, heavy duty	Up to ~1000 Ncm+	Continuous duty, robust design	Industrial automation, defense

GM20

Maximum radial shaft load: 300N
(10 mm from the fixing flange)
Maximum axial shaft load: 150N
Direction of rotation depending on polarity
Can be mounted in any position
Temperature working range: -20 °C/60 °C
Approx weight: 700/900g

GM19

Maximum radial shaft load: 200N
(10 mm from the fixing flange)
Maximum axial shaft load: 100N
Direction of rotation depending on polarity
Can be mounted in any position
Temperature working range: -20 °C/60 °C
Approx weight: 385/480g

GM18

Maximum radial shaft load: 200N
(10 mm from the fixing flange)
Maximum axial shaft load: 50N
Direction of rotation depending on polarity
Can be mounted in any position
Temperature working range: -20 °C/60 °C
Approx weight: 85g