Introduction
GRI rigid couplings are designed for high torque applications, offering a robust and maintenance-free connection. Made from fully turned steel with a phosphating treatment, these couplings provide a compact and extremely rigid connection with finished bores adhering to ISO H8 tolerance.

Specifications
- Torque: Up to 860 Nm
- Bore: 50 mm
- Material: Steel with phosphating treatment
- Surface Finish: Ra=1.6 µm
- Tolerance: h6

Customization Options
Custom bore sizes, single or two-piece clamp hubs with or without keyways, and anti-corrosive surface treatments are available upon request.

Dimensioning and Fitting
The couplings are designed to connect two shafts of the same diameter without allowing significant misalignment. The nominal torque must exceed the motor's maximum torque. Proper alignment and surface finish of the connecting shafts are crucial.

Technical Data
Various sizes are available, each with specific torque, weight, inertia, and maximum speed ratings. Locking types B and C are available, with specific tightening torques for each size.

Application Example
Locking types B and C are used for different applications, with specific screw sizes and tightening torques provided.

Order Example
Model: GRI GR.20, Bore Ø20 H7, Locking Type B.

Conclusion
GRI rigid couplings offer a reliable solution for high torque applications, with customizable options to meet specific needs.