| Material of HB Hardness and R m Strength [MPa] | Type of Torsion Load | Values of Allowable Stresses τ At [MPa] | 
| 145< HB< 250 | constant | 40 | 
| 500< Rm< 850 | repeating | 28 | 
| - | alternating | 20 | 
| 250< HB< 350 | constant | 56 | 
| 850< Rm< 1200 | repeating | 40 | 
| - | alternating | 28 | 
| HB> 350 | constant | 80 | 
| Rm> 1200 | repeating | 56 | 
| - | alternating | 40 |