Short answer: once. A click-type torque wrench clicks when the set torque has been reached, and that first click is the finish line. Pulling again to produce a second click applies the set torque a second time, which on a fastener that has already arrived means over-tightening it. Park Tool puts it plainly: once the head of the wrench deflects, the set torque value has been achieved, and turning the wrench past the point of deflection over-tightens the fastener.
What the click is
Inside a micrometer click wrench, a spring-loaded cam holds the head rigid against the handle. You set the scale, which sets the spring preload. When the torque you apply exceeds that preload, the cam slips over its detent — the head deflects a few degrees relative to the handle, and the detent re-seating is the noise. It is a mechanical threshold, not a counter, and it has no memory of whether it has fired before.
That is why the question matters. The wrench will click again, and again, every time you pull past the threshold, and each of those pulls is another torque application on a joint that is already at spec.
Why people hear two clicks
| What you heard | What it probably was | What to do |
|---|---|---|
| Two clicks close together | The cam slipping and the handle rebounding against the detent as you eased off | Nothing - the fastener reached spec on the first one |
| A click then a second click after you pulled again | Two separate torque applications | Stop at the first. The joint is now over-torqued; back it off and redo it if the spec is critical |
| A faint click you were not sure about, then a clear one | A low setting where the break is quiet, then an overshoot | Watch and feel for the head deflecting instead of listening |
| Clicking continuously as you pull | Cam slipping repeatedly because you are still applying force | Release pressure the instant the head breaks |
| A click almost immediately | Wrench set too low, or left wound up in storage and drifted | Check the setting, then check calibration |
The second row is the one worth taking seriously. Re-pulling to "confirm" is the most common torque wrench mistake, and on an aluminum component or a small fastener it is enough to do damage. The confirmation you want is visual: the head deflected, so the joint is at spec.
Feel it, do not listen for it
The short version
- At low settings the click is quiet - sometimes inaudible in a garage with a radio on. The deflection is always visible and always felt.
- Pull smoothly and slowly through the last part of the travel. A fast pull carries the fastener past the threshold through momentum before you can stop.
- One hand on the grip, at the grip. Pushing on the head or extending the handle changes the torque actually applied.
- Release pressure the moment the head breaks. Do not hold it there and do not nudge it again.
The full procedure, including setting the scale and the sequence for a wheel, is in how to use a torque wrench and how to torque lug nuts.
If it clicks immediately
A wrench that clicks as soon as you take up the slack is telling you one of three things. The setting is far lower than you think — check the scale and the lock ring, and check which unit you are in, because a wrench set to 40 Nm will click much earlier than one set to 40 ft-lb. The fastener is already at or above the set torque, which is common when you are checking something a shop tightened with an impact gun. Or the wrench has drifted.
Drift usually comes from storage. A click wrench left wound up to a high setting holds its spring compressed, and over months the relationship between the scale and the actual break point moves. Wind it down to the lowest setting on the scale after every use — not to zero if the manufacturer says otherwise, but to the bottom of the scale. A split-beam wrench is exempt from this, which is the main practical argument for owning one.
Checking whether the click is still honest
You cannot calibrate a wrench at home, but you can find out whether it has moved. A comparison check against a second wrench, or a known weight at a measured distance, will tell you whether the break point is roughly where the scale says. How to check torque wrench calibration sets out what that test can and cannot establish — and where to send the wrench if the answer is bad.
If the click has become something you squint at rather than trust, the honest fix is a mechanism that does not ask you to interpret anything. An electronic wrench signals the target with vibration, a buzzer and an LED simultaneously; click vs digital is the comparison.
The rule
One click, then stop, then move to the next fastener. Pull slowly so you can stop on the break. Watch for the head deflecting rather than waiting for a sound. Wind a click wrench down before it goes in the case. And if you find yourself pulling twice to feel sure, buy the mechanism that tells you properly rather than training yourself to guess better.