| Glossary | Machining Data | 
        
            | Ts (Nm) | Screw/bolt tightening torque | Recommended shaft & hub tolerances for full torque transmission are : | 
        
            | T   (Nm) | Torque transmissible with tightening torque Ts | All shafts 
 | h8except
 | All hubs 
 |  H8
 | 
        
            | F   (kN) | Force transmissible with tightening torque Ts | DL40 shaft DL50* shaft
 | h9 h6
 | DL40 hub DL50* hub
 | H9 H7
 | 
        
            |   P (N/mm2) | Hub/shaft surface pressure | * DL50 < 40mm diam. |