What is the typical torque of a human's single hand?
2 Answers
The typical range of torque for a human's single hand is: 60N—120N. Introduction to Torque: Torque is a special moment that causes an object to rotate. The torque of an engine refers to the moment output from the crankshaft end of the engine. Under fixed power conditions, it has an inverse relationship with engine speed: the faster the speed, the smaller the torque, and vice versa. It reflects the load capacity of a car within a certain range. External torque is called external moment or external couple moment, while internal torque is called internal couple moment or simply torque. Engine Torque: The torque of an engine refers to the moment output from the crankshaft end of the engine. Under fixed power conditions, it has an inverse relationship with engine speed: the faster the speed, the smaller the torque, and vice versa. It reflects the load capacity of a car within a certain range.
I remember when I started DIY car repairs years ago, I tested how much torque I could apply. The average person can generate about 20-40 Newton meters of torque with one hand, depending on physical condition. For instance, as someone who exercises regularly, I can reach 35 Newton meters, while my wife only manages around 20 Newton meters. However, this level of force is far from sufficient in automotive repairs—lug nuts for wheel changes require a safe torque value of 80-120 Newton meters. Relying solely on hand strength can easily lead to misalignment or loosening. Once, when I had a flat tire on the highway, I tried tightening the nuts manually, only for the wheel to start wobbling after a few kilometers. Fortunately, I noticed it in time. Since then, I've insisted on using a torque wrench to ensure precision and prevent accidents. Car components are sensitive, so I recommend every car enthusiast understand their personal limits—safety first, never cut corners for temporary convenience.
