Worm gearmotors and worm gear reducers
Worm gearmotors transmit drive at 90° through a worm gear. They offer a high ratio in a compact housing, quiet running and — at high ratios — self-locking (161 pcs in stock). They are popular in gates, feeders, agitators and wherever simplicity and low cost matter.
We offer complete gearmotors (used and inspected, or new) as well as worm gear reducers without a motor. We also stock worm gear reducers in sizes 30–150 and assemble them into a gearmotor with a motor matched to your machine.
NewSTOJAN
Gear reducer / worm gearbox 25 and=20 56B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=7,5 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=30 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=25 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=60 63B14/B5
UnusedIntec
Gear reducer / worm gearbox INV 44P
NewSTOJAN
Gear reducer / worm gearbox 30 and=20 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=7,5 56B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=50 56B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=50 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=10 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=80 56B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=80 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=15 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 30 and=40 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=15 71B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=40 71B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=10 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=20 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=60 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=30 71B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=50 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=30 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=20 71B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=10 71B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=80 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=15 63B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=25 71B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=5 71 B14/B5
NewSTOJAN
Gear reducer / worm gearbox 40 and=40 63B14/B5
Size 30–150 worm gear reducers — gearmotors assembled to order
Besides complete gearmotors, we stock worm gear reducers with an IEC motor flange: sizes 30–90 with an aluminium housing, and 110, 130 and 150 in cast iron. We assemble them into complete gearmotors with new or used motors from our warehouse, with a B14 or B5 flange. Assembly is included in the price, and if both the reducer and the motor are in stock, we assemble the set straight away.
On the reducer page you choose the size, ratio and motor, and the shop immediately shows the output speed.
For sizes 30–130 we also have accessories: torque arms, output shafts and side flanges.
| Reducer size | Shaft diameter | Accessories in the shop |
|---|---|---|
| 30 | Ø 14 mm | torque arm, single output shaft, double output shaft, FA flange |
| 40 | Ø 18 mm | torque arm, single output shaft, double output shaft, FA flange, FB flange |
| 50 | Ø 25 mm | torque arm, single output shaft, double output shaft, FA flange, FB flange |
| 63 | Ø 25 mm | torque arm, single output shaft, double output shaft, FA flange, FB flange |
| 75 | Ø 28 mm | torque arm, single output shaft, double output shaft, FA flange, FB flange |
| 90 | Ø 35 mm | torque arm, single output shaft, double output shaft, FA flange, FB flange |
| 110 | Ø 42 mm | torque arm, single output shaft, double output shaft, FA flange |
| 130 | Ø 45 mm | torque arm, single output shaft, double output shaft, FA flange |
How to choose a worm gear ratio
The output speed is the motor speed divided by the ratio. The table shows the output speed (rpm) for 700, 900, 1400 and 2900 rpm motors. We only combine 2900 rpm motors with ratios up to 1:15. A faster motor does not make a stronger gearmotor — it only changes the output speed.
| Ratio | 700 rpm motor | 900 rpm motor | 1400 rpm motor | 2900 rpm motor |
|---|---|---|---|---|
| 1:7.5 | 93 | 120 | 187 | 387 |
| 1:10 | 70 | 90 | 140 | 290 |
| 1:15 | 47 | 60 | 93 | 193 |
| 1:20 | 35 | 45 | 70 | |
| 1:25 | 28 | 36 | 56 | |
| 1:30 | 23 | 30 | 47 | |
| 1:40 | 18 | 23 | 35 | |
| 1:50 | 14 | 18 | 28 | |
| 1:60 | 12 | 15 | 23 | |
| 1:80 | 9 | 11 | 18 | |
| 1:100 | 7 | 9 | 14 |
The higher the ratio, the higher the torque on the output shaft, but the lower the efficiency of the worm gear.
Frequently asked questions
Is a worm gearmotor self-locking?
At a sufficiently high ratio, yes: the worm cannot be turned from the output shaft, so the position is held without a brake. For low ratios this has to be confirmed for the specific model.
Can I buy a worm gear reducer with a motor?
Yes. We stock worm gear reducers in sizes 30–150 and assemble them with motors from our warehouse, with assembly included in the price. You choose the motor on the reducer page and the shop shows the output speed.
What output speed does a 1:50 worm gear reducer give?
With a 1400 rpm motor approx. 28 rpm at the output, with a 900 rpm motor approx. 18 rpm. The output speed is always the motor speed divided by the ratio. We only combine 2900 rpm motors with ratios up to 1:15.
What is the difference between a worm gear reducer and a worm gearmotor?
A worm gear reducer is the gear unit alone, without a motor — it is mounted on a motor with a matching flange. A gearmotor is the complete set: gear unit and motor together.