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Introduction to Torque Applying Tools

WHAT ARE THEY USED FOR?

  • Torque applying tools are used to apply a set torque to a fastener
  • The tool will slip, break or click to signal to the operator when the set torque is reached

WHAT TYPES ARE THERE?

  • Preset Tools are ideal in environments that require the same torque to be applied to a fastener time after time. These types of tool are tamperproof so are ideal for use by staff who are not highly skilled. The tools must be set using a Calibration Analyser
  • Calibrated Scale Tools have a visible scale that allows the user to adjust the tools to their desired torque setting. This tool is ideal for use in areas where a range of different torque settings need to be applied

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Different Torque Tool Mechanisms

Click Tools (overtightening Possible)

When the preset torque value is reached the operator will hear a click, feel an impulse and there will be approximately 3° of tool movement. Resetting takes place when the hand pressure is released. Work can then immediately continue.

These tools are length dependent – the position of the hand on the tool alters the torque produced. Continued application of force after the 3° of movement will cause the torque applied to increase above the required preset limit.

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Breaking Tools (overtightening Unlikely)

When the preset torque value is reached, these tools break at a specific point along the tool’s length – usually at a pivot point near the tool’s head. In most cases the movement is approximately 20°. The tool is automatically reset by allowing the handle to return to its in line position.

These tools are length dependent, with hand position altering the torque applied. Continued application of force after 20° of tool movement will increase the torque applied above the preset limit but with the greater angle of tool movement this is less likely.

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Slipping Tools (overtightening Impossible)

When the preset torque value is reached, a mechanism in the tool causes the application of torque to cease and the tool slips free for a short time until resetting occurs. Even if the application of force is repeated, the preset torque value will not be exceeded, therefore making it impossible to overtighten a fastener.

These tools are not length dependent.

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