Axle Rotary Shaft Torque (\( T \)):

\[ T = F \times L \]

Where:

• \( T \) is the shaft torque, in kilogram-meters (kg-m).
• \( F \) is the axle or rotary shaft load, in kilograms (kg).
• \( L \) is the length of the pony brake arm, in meters (m).