I am looking at servos to make a robot claw, and I want to make sure the one i am getting can turn under a specific amount of weight. The servos specify their torque in oz-in. I am not sure how to read this.

What i need to know is, how to I convert oz-in into the specific weight it can withstand in lbs.


1 Answer 1


If you are not familiar with the unit of measurement:

1 oz-in = 0.00706 Nm

if you are not familiar with torque:

1 Nm torque translates to 1N of force at a radial distance from the shaft of the motor of 1 m. As 1N gravitational force corresponds to an approx. 0.1kg weight, 1 Nm torque can lift* 0.1kg weight 1m away from the shaft, or 1 kg weight 0.1m away from the shaft.

*Lift in this case means that if such weight is attached to the rotor, the rotor would be in equilibrium, less weight then this would start to rotate.

  • $\begingroup$ So, if i had a length of 2M with 1Nm, would that make 0.5N? @50k4 $\endgroup$
    – X Builder
    Oct 21, 2020 at 22:54
  • $\begingroup$ exactly, 2m radial distance, 0.5N $\endgroup$
    – 50k4
    Oct 21, 2020 at 23:06

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.