3.2.1-16 Key Force

The maximum force required to depress keys should be between 0.9 and 5.4 ounces (0.25 and 1.5 N); a key force of between 1.8 and 2.2 ounces (0.5 and 0.6 N) is preferred.

Additional Information:
The force required for key displacement should be 1.1 to 2.7 ounces (0.3 to 0.75 N) for repetitive keying tasks.