Parallel key calculator
Shaft dia + torque → key shear & bearing stress, strength check, length hint.
How to use
- Enter the calculation conditions
Enter the dimensions, loads, speeds or operating conditions requested by the form.
- Run the calculation
The tool applies the formulas shown on this page to the entered values.
- Review the result
Review the resulting specification and checks, then verify them against the cited source, current standard and real operating conditions before use.
Core formula
F = 2 · T / d
Example using default values
F = 2 · 120 · 1,000 / 30 = 8,000 N (8 kN)
Source: Shigley Mechanical Engineering Design / JIS B 1301.
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