GN 2246

Bore code

Type B: without keyway

Version in Aluminum AL

  • anodized, natural color
  • temperature resistant up to 150 °C
  • Socket cap screws DIN 912, Steel blackened

Version in Stainless Steel NI

  • AISI 303
  • temperature resistant up to 200 °C
  • Socket cap screws DIN 912, Stainless Steel AISI 304 Cu

Beam couplings GN 2246 transmit angle positions and torques with extreme precision and no backlash. They are manufactured of a single piece and offer high torsional stiffness thanks to the alternating slits. The clamping hubs make beam couplings very easy to assemble.

They are used in applications where precise position and movement transmission is required, such as in the drive systems of position measuring systems and in test benches.

The Stainless Steel version can also be used in environments requiring high corrosion resistance, such as in medical technology (CAT scanners) and food-processing equipment (confectionary machines).

  • Bore with keyway

  • ISO-Fundamental Tolerances 
  • Stainless Steel characteristics 

Version in Aluminum
d1Rated torque in NmMax. speed (min-1)Moment of inertia in kgm2Static torsional stiffness in Nm/radMax. shaft misalignment
lateral in mmaxial in mmangular in ˚
120.452.0007.8 x 10-8450.1± 0.32
160.539.0003.4 x 10-7800.1± 0.42
20131.0009.1 x 10-71700.1± 0.42
25225.0002.6 x 10-63800.15± 0.52
32419.0009.7 x 10-65000.15± 0.52
Version in Stainless Steel
d1Rated torque in NmMax. speed (min-1)Moment of inertia in kgm2Static torsional stiffness in Nm/radMax. shaft misalignment
lateral in mmaxial in mmangular in ˚
120.352.0002.2 x 10-7640.1± 0.22
160.539.0009.0 x 10-7850.1± 0.32
20131.0002.5 x 10-62500.1± 0.32
25225.0007.1 x 10-63300.15± 0.42
323.519.0002.7 x 10-58500.15± 0.52

Like all mechanical parts, shafts are subjected to manufacturing and assembly tolerances that generally cannot be entirely eliminated even with extensive technical measures. If these deviations are not taken into account in the design, the result can be vibrations, running noises, and wear or damage to the shafts and their bearings. Suitable couplings not only are able to effectively compensate for misalignment and runout errors, they also greatly simplify the assembly process, thereby reducing the overall labor required. Shaft misalignment and runout errors can vary in nature and should always be taken into consideration when selecting the appropriate coupling.

Error typeMisalignment diagram
Lateral: The axes of the shafts are in fact parallel, but they are offset laterally and do not line up.____logo__2240-BL-36192-0__
Angular: The axes of the shafts do not lie in the same plane, they meet at a certain angle.____logo__2240-BL-36663-0__
Axial: The shafts move axially along the axis of rotation.____logo__2240-BL-36669-0__
Runout: The shafts move radially out of the center of the axis of rotation.____logo__2240-BL-36671-0__

For correct fastening of the coupling hubs, the shaft must be installed according to the recommended shaft insertion depth l2. The shaft insertion depth l2 is specified in the standard sheet of the respective coupling. If the insertion depth is too low, the shaft could slip out of the coupling, or the clamping hub could break. If the shaft is inserted too far, this can cause interference within the coupling, leading to damage.


The diagrams show the change in static torsional stiffness within the permissible operating temperature range, under the assumption that the static torsional stiffness at 20 °C is 100 percent. The torsional stiffness of the couplings decreases with increasing temperature.


When the shaft ends are installed in eccentric arrangements, the coupling constantly attempts to return to its neutral position. The resulting force is referred to as restoring force. If the couplings are installed with the lowest possible eccentricity, the resulting restoring forces are lower. This also reduces the force acting on the shaft bearing.


If the coupling is under pressure, subject to compressive load in the axial direction, it will strive to return to its neutral position. The force that counteracts the compressive force is referred to as restoring force. Lowering the compression acting on a coupling results in a lower restoring force and less force exerted axially. This must always be taken into account in dimensioning the coupling.



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