Tightening and loosening torques describe the force required to tighten or loosen a screw connection.

The torque (force) applied during commissioning of a bolt.

Torque is a physical quantity and has the designation rotational force.
A common unit of torque is the newton-metre (abbreviated to Nm).
One newton-metre represents the rotational force required to rotate an object with a lever arm about a specific point.

[Wikipedia / Further explanation: de.wikipedia.org/wiki/Torque]

We distinguish between

• tightening torque: to avoid overloading the bolt with excessive force, the precise ‘tightening’ of a bolt should, where possible, be carried out using a torque wrench.
  The tightening torque specifies the range (Nm or lbf·ft) within which the torque wrench should ideally be used.
• Loosening torque: an impact wrench can help to loosen a tightly seated bolt. The loosening torque indicates how much ‘power’ the tool has.
• But be careful! Whether you’re loosening or tightening – the saying‘Since tight comes loose’should be taken seriously. A stripped screw means extra work.
  If it does happen, HAZET has suitable tools in its range

Applies to HAZET impact wrenches:

Maximum tightening torque

(Tightening the screw connection – clockwise)

• Experience shows that, in terms of duration, the tightening torque only increases up to a certain point. The torque curve rises until a trigger duration of X seconds is reached and then flattens out sharply.
  The maximum tightening torque is determined over a period during which the torque corresponds to the highest point of the steep rise in this curve.
  Continuous operation in this range places the maximum strain on the component and affects its service life. The time taken to reach the desired torque is sensibly limited to prevent extreme wear.
  In our laboratory tests, this time is a maximum of 30 seconds.

Recommended tightening torque

(Tightening the screw connection – clockwise)

• The recommended tightening torque represents the value reached after a limited application time. This value offers a good balance between performance and service life. The product is not subjected to maximum stress here. Adhering to this value / actuation time ensures optimum wear performance. This time is approx. 5 to 10 seconds

Maximum loosening torque

(Loosening the screw connection – anticlockwise)
The method for determining the maximum loosening torque is similar to that for the maximum tightening torque, but in the loosening direction. In this case, the micrometer screw is first tightened in a controlled manner using a torque. The maximum loosening torque is then the value that the impact wrench can achieve under laboratory conditions within a maximum of 30 seconds.

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