Torque
Torque is a twisting force — how hard something is being turned around an axis, rather than pushed in a straight line. It is the rotational equivalent of force, and it is the single number that decides whether an engine can turn a wheel, a bolt, or a bucket wheel the size of a building.
01Definition
Torque is a twisting force — how hard something is being turned around an axis, rather than pushed in a straight line. It is the rotational equivalent of force, and it is the single number that decides whether an engine can turn a wheel, a bolt, or a bucket wheel the size of a building.
02Physical Principle
Torque depends on two things: how hard you push, and how far from the pivot you push it. The same 50 kg push on a 2-metre wrench produces twice the twisting effect of the same push on a 1-metre wrench — the force hasn't changed, only its leverage has. Every gearbox, final drive, and hydraulic motor on this site exists to change that lever arm without changing the force at the source.
03Mathematical Foundation
04Interactive Diagram — Lever & Torque
Slide the applied force and the lever-arm length to see how the torque at the pivot responds.
τ = F × r — the same force produces more torque the farther it acts from the pivot.
05Interesting Facts
- A diesel engine's torque, not its horsepower, is what actually gets a loaded haul truck moving from a dead stop — horsepower only matters once the truck is already rolling.
- Torque and power are linked by rotational speed: P = τ × ω, which is why a low-revving diesel and a high-revving turbine can produce the same power from very different torque figures.
- Torque wrenches exist because a bolt is really a very short, very stiff lever — over-torque it and you don't push it in further, you shear the threads.