Product characteristics
• Double-cardanic all-steel coupling
• High torques at small overall dimensions
• The coupling complies with the AGMA Standard "9008-B00"
• Range of use from - 20°C up to + 80°C
• Application area, e. g. general engineering
• pump drive
• compressors
• steel mill sector
• Short-designed
• Both hubs turned inwards
• Shortest shaft distance dimension
Coupling description
GEARex® couplings made from steel with grease lubrication and toroidal sealing ring correspond to the international 
standard. Being flexible shaft connections they are suitable for a positive torque transmission. In addition, they 
ensure to compensate for axial, radial and angular shaft displacements.
GEARex® couplings are used in every range of general engineering requesting for high operating safety and a long 
service life resulting from the reliable grease lubrication of the crowned spline. The couplings are suitable for 
horizontal assembly. As special solutions they are suitable for vertical assembly, too.
Numerous coupling sizes for a torque transmission from 930 Nm to 820.000 Nm with shaft dimensions up to a 
maximum of Ø 450 mm are available. The coupling torques may be increased by using special materials.
GEARex® couplings are in correspondence with the AGMA standard (American Gear Manufacturer Association). 
Small dimensions and a low weight along with a small mass moment of inertia result in a wide range of applications 
of GEARex® couplings.
Click on image to enlarge

Operating Principle

According to the operating principle of the well-known crowned gear edge pressure in the spline is avoided in 
case of angular and radial displacements. Moreover, permanent grease lubrication produces a better friction ratio 
of the spline with an operation almost free from wear along with a long service life of the coupling.
In order to ensure a regular and verified lubrication in assembled condition, two connections for hydraulics are 
arranged opposite to each other radially on each coupling sleeve. As a result a complete GEARex® coupling has 
four connections being offset to each other by 90°.
The interior of the coupling is sealed by means of toroidal sealing rings (NBR 70 ShA).
The feather keys have to be sealed against escape of lubricants during the assembly.