GN 3975 Worm Gear Reducers Aluminum


GN 3975 Worm Gear Reducers, 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:
-4 °F to +140 °F (-20 °C to +60 °C)

RoHS compliant

Technical drawing

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GN 3975 Worm Gear Reducers, Aluminum sketch

Part Options / Table


AOutput on one side
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Dimensions in: Inch (change to Metric)
m1d1 ±0.0002Gear ratio ib1b2b3 ±0.0006d2 +0.001d3d4d5hl1l2l3l4t1t2t3t4m10
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Dimensions in: Inch (change to Metric)
0.79M 40.17M 51.021.970.690.
* Usable thread depth: min. 1.6 x d6 / d8

Build & Price

3D Product Configurator
Center distance m1

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 68 °F (20 °C)

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m1Gear ratioMax. input torque in Nm*
at 100 rpm
at 500 rpmat 1000 rpmMax. output torque in Nm*
at 100 rpm
at 500 rpmat 1000 rpm
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Gear ratioInput side
Max. radial force**
Max. axial force***Output side
Max. radial force**
Max. axial force***Efficiency
in %
1344.96 lbf (200 N)44.96 lbf (200 N)112 lbf (500 N)112 lbf (500 N)56
1556.2 lbf (250 N)56.2 lbf (250 N)112 lbf (500 N)112 lbf (500 N)52
1856.2 lbf (250 N)56.2 lbf (250 N)112 lbf (500 N)112 lbf (500 N)55x
2356.2 lbf (250 N)56.2 lbf (250 N)112 lbf (500 N)112 lbf (500 N)50x
3078.68 lbf (350 N)78.68 lbf (350 N)112 lbf (500 N)112 lbf (500 N)45x
4089.92 lbf (400 N)89.92 lbf (400 N)112 lbf (500 N)112 lbf (500 N)39x
65112 lbf (500 N)112 lbf (500 N)112 lbf (500 N)112 lbf (500 N)29x

*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 d7 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

Total US Dollars (net)
Call / Email for Delivery Time
Please note our quantity discounts (US Dollars).
≥ 50$309.52
Prop 65: Not compliant
Cancer and Reproductive Harm -
RoHS: Compliant
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)).
Weight: 0.930 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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Need Help?

Our service team is available from Monday to Friday between 7:30 AM and 5:00 PM Central Time: 800-877-8351

Special Requests | Contact our sales team

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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