GN 3971 Bevel Gear Boxes Aluminum


GN 3971 Bevel Gear Boxes, 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 finish, natural colorAN

Bevel gear wheels
Steel, case-hardened

Ball bearing

  • Steel
  • Sealed (sealing disks 2RS)

Temperature range:
-4 °F to +140 °F (-20 °C to +60 °C)


Technical drawing

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GN 3971 Bevel Gear Boxes, Aluminum sketch

Part Options / Table


LAngular gear 90°
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Dimensions in: Inch (change to Metric)
b1d1 ±0.0002b2d2d3**hl1l2l3l4m1t1t2
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Dimensions in: Inch (change to Metric)
0.710.12M 3M 3M 30.240.330.510.43
0.790.12M 3M 3M 30.280.390.590.39
0.940.16M 4M 4M 40.310.470.710.63
1.020.16M 4M 4M 50.350.510.790.63
1.180.16M 4M 4M 50.430.590.870.63
1.260.16M 4M 4M 50.470.670.940.63
1.380.16M 4M 4M 50.530.691.020.63
* Deviating from DIN 6885

** Theoretically usable hub diameter

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

**** Usable thread depth: min. 1.6 x d7

Build & Price

3D Product Configurator
Width b1

Diameter d1

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 68 °F (20 °C)


Permanent lubrication with grease, maintenance-free

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b1Max. torque in Nm
at 100 rpm

at 500 rpm

at 1000 rpm
Max. radial force*Max. axial force
180.350.10.0513.49 lbf (60 N)13.49 lbf (60 N)
200.750.30.1522.48 lbf (100 N)22.48 lbf (100 N)
242.510.526.98 lbf (120 N)26.98 lbf (120 N)
2641.50.7531.47 lbf (140 N)31.47 lbf (140 N)
3052153.95 lbf (240 N)53.95 lbf (240 N)
32831.5124 lbf (550 N)124 lbf (550 N)
351042124 lbf (550 N)124 lbf (550 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

Total US Dollars (net)
In Stock: 2
In Stock
Please note our quantity discounts (US Dollars).
≥ 50$198.63
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: 0.055 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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