Gearboxes

Compare planetary, round and flat spur, and worm gearboxes for the speed reduction and mounting arrangement your mechanism needs.

GEARBOXES

A gearbox trades motor speed for output torque, allowing a smaller or faster motor to drive a slower mechanism. The useful output depends on the ratio and transmission losses, while the gearbox itself has load limits that must be respected.

Choose the geometry first: planetary units provide an inline arrangement, flat spur housings suit spaces with restricted height, round spur units fit cylindrical mounting spaces, and worm gearboxes offer a different input-to-output layout. Confirm the input interface and shaft arrangement for the specific model before mating it to a motor.

Check the selected gearbox against:

Required output speed and reduction ratio
Continuous and peak output loads
Motor input speed and mounting compatibility
Housing dimensions, output shaft and available clearance

If you need a motor and gearbox together, compare the listed gearmotor combinations. A calculated motor output does not override the gearbox's continuous torque limit.

Model	GB Ø (mm)	Ratio (:1)	Cont. torque (mN·m)	GB length (mm)	Shaft Ø (mm)	Net mass (kg)	Specification	CAD	3D CAD
PG16	16	4 – 1024	98.07 – 392.27	13.7 – 28.1	3	0.0141 – 0.027		—
PG22	22	4.4 – 812	294.2 – 980.67	13.9 – 24.7	4	0.03 – 0.0528	—	—	—
PG25	25	4 – 1026	294.2 – 980.67	25 – 40.3	6	0.0501 – 0.0976	—	—	—
PG28	28	5 – 1319	1961.33 – 9806.65	25.9 – 52.1	6	0.0666 – 0.139		—
PG32	32	5 – 1844	4903.33 – 9806.65	25.9 – 52.1	6	0.096 – 0.196	—	—	—
PG36	36	5 – 2578	1961.33 – 9806.65	29.9 – 56.1	8	0.1449 – 0.2917		—	—
PG42	42	3.7 – 1590	4903.33 – 19613.3	29 – 76.4	8	0.25 – 0.7		—	—
PG45	45	3.7 – 1590	4903.33 – 19613.3	30.8 – 78.2	10	0.256 – 0.707		—	—
PG52	52	3.7 – 1896	9806.65 – 39226.6	38.2 – 100.7	12	0.32 – 0.906		—	—
PG56	56	3.7 – 1896	9806.65 – 39226.6	38.2 – 100.7	12	0.431 – 1.226		—	—

Model	GB Ø (mm)	Ratio (:1)	Cont. torque (mN·m)	GB length (mm)	Shaft Ø (mm)	Net mass (kg)	Specification	CAD	3D CAD
SG37A	37	10 – 2430	98.07 – 588.4	22.5 – 29	6	0.064 – 0.096		—	—
SG37B	37	10 – 2430	98.07 – 588.4	23.5 – 30	6	0.064 – 0.096		—	—
RG50A	50	7.2 – 3415	980.67 – 2942	26.4 – 37.7	8	0.171 – 0.177		—	—
RG50B	50	7.5 – 3532	980.67 – 2942	26.4 – 37.7	8	0.171 – 0.177		—	—
SG27	27	30 – 610	98.07 – 196.13	17.8 – 25.1	4	0.035 – 0.038		—	—
SR28	28	8 – 108	49.03 – 117.68	22.5	4	0.057 – 0.059	—	—	—
SR25	25	8 – 783	29.42 – 147.1	23.5 – 31.5	4	0.044 – 0.047	—	—	—
SR32	32	10 – 550	98.07 – 294.2	24.5 – 32	6	0.075 – 0.081	—	—	—
SR37	37	9.5 – 1154	196.13 – 588.4	30.5 – 38	6	0.108 – 0.126		—	—
TG40	40	10 – 1666.2	294.2 – 1471	32	6	0.133 – 0.141		—	—

Model	Ratio (:1)	Cont. torque (mN·m)	GB length (mm)	GB width (mm)	GB height (mm)	Shaft Ø (mm)	CAD	3D CAD
AF	13.6 – 529	294.2 – 980.67	73	47	21	8	—	—
VF	36 – 833	980.67 – 2942	76.2	69.8	18	8	—	—
MG	13 – 718	980.67 – 2942	70	70	18	8	—	—
TT	36 – 1166	294.2 – 980.67	95	60	16	8	—	—
GF	127 – 5078	2942 – 9806.65	119	70	25	9.5	—	—
TA	35 – 777	14709.98 – 29419.95	133	60	25.5	8	—	—