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GN 3975 Worm Gear Reducers Housing Aluminum


GN 3975 Worm Gear Reducers, Housing Aluminum

Product description


Worm gear reducer GN 3975 can transmit high torque despite their very compact dimensions. They can readily be used for a multitude of applications, such as incline adjustments or to change the direction of shaft rotation.

The numerous fastening holes allow for simple mounting in any orientation or position. The parallel keys can take any angular positions.

Depending on the gear ratio, there may be no static self-braking between the worm screw and worm wheel, meaning that the worm wheel can be turned out of a resting state by a torque coming from the output end.


  • Aluminum
  • Sealed to prevent dust entry
  • Anodized, natural colorAN

Worm screw, steel
Worm wheel, brass
Ball bearing
  • Steel
  • Sealed (sealing disks 2RS)

Temperature range: -20 °C to +60 °C


Technical drawing

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GN 3975 Worm Gear Reducers, Housing Aluminum sketch

Article options / Table


AOutput on one side
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m1d1 j6Gear ratio ib1b2b3 JS9d2 H7d3d4d5hl1l2l3l4t1t2t3t4m10
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20M 44,2M 5265017,51,5312642,522,5
* Usable thread depth: min. 1.6 x d6 / d8

Build & Price

Open 3D configurator

Diameter d1
Gear ratio i

Mechanical Features

Circumferential backlash at the drive shaft

1° ± 0.5°

Shaft direction of rotation


Worm wheel set design


Life expectancy (guide value)

1,000 hours under full load and rotational speed of 500 rpm,
assuming the gear box is operating for 20% of every 5 minutes
(1 minute of operation + 4 minutes break) at an ambient temperature of 20 °C

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m1Übersetzungmax. Antriebsdrehmoment in Nm*
bei 100 min-1
bei 500 min-1bei 1000 min-1max. Abtriebsdrehmoment in Nm*
bei 100 min-1
bei 500 min-1bei 1000 min-1
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max Radialkraft in N**
max. Axialkraft in N***Abtriebsseite
max Radialkraft in N**
max. Axialkraft in N***Wirkungs-
grad in %

*Input side speed, **at axial force = 0, ***at radial force = 0

Assembly Instructions

Do not exert any forces onto the housing or into the bearings during assembly. Use of the threaded holes d8 in the shaft is recommended.

The use of a corresponding coupling is recommended to compensate for manufacturing-related shaft offsets and runout tolerances as well as for damping vibrations and shocks.

Application Examples


Selected Part (How to order)

Total (net)
plus VAT 40,49 €
gross 253,59 €
In stock
Weight: 0,422 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone +49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances).
Please note our order discounts.
With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 50,00 €
All prices in accordance with our price list No. 55, valid from 1 September 2022, plus VAT only valid for Germany.

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Our service team is available from Monday to Friday between 7:00 AM and 5:30 PM: +49 7723 6507 - 0

To the customised elements | To the contact persons

GN 3975-20-A-12-13-ANGN 3975-20-A-12-15-ANGN 3975-20-A-12-18-ANGN 3975-20-A-12-23-ANGN 3975-20-A-12-30-ANGN 3975-20-A-12-40-ANGN 3975-20-A-12-65-AN

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