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GN 3971 Bevel Gear Boxes Housing Aluminum


GN 3971 Bevel Gear Boxes, Housing Aluminum

Product description


Bevel gear boxes GN 3971 can transmit high torque despite their very compact dimensions. They can readily be used for a multitude of applications, such as height 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.



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

Bevel gear wheels
Steel, case-hardened

Ball bearing

  • Steel
  • Sealed (sealing disks 2RS)

Temperature range: -20 °C to +60 °C


Technical drawing

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GN 3971 Bevel Gear Boxes, Housing Aluminum sketch

Article options / Table


LAngular gear 90°
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b1d1 j6b2d2d3**hl1l2l3l4m1t1t2
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183,1M 3M 3M 368,51311
203,1M 3M 3M 37101510
244,1M 4M 4M 48121816
264,1M 4M 4M 59132016
304,1M 4M 4M 511152216
324,1M 4M 4M 512172416
354,1M 4M 4M 513,517,52616
* Deviating from DIN 6885

** Theoretically usable hub diameter

*** Usable thread depth: min. 2 x d5 / d6

**** Usable thread depth: min. 1.6 x d6

Build & Price

Open 3D configurator


Mechanical Features

Gear ratio i


Circumferential backlash at the drive shaft

3° ± 0.5°

Shaft direction of rotation


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


Permanent lubrication with grease, maintenance-free

Show / Hide columns
b1Max. torque in Nm
at 100 rpm

at 500 rpm

at 1000 rpm
Max. radial force
in N*
Max. axial force
in N**

*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 d6 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 Example


Selected Part (How to order)

Total (net)
plus VAT 25,40 €
gross 159,06 €
In stock
Weight: 0,055 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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