Torque wrench for air conditioning systems
Flare nuts need a defined tightening torque. Too tight damages the flare or deforms the sealing face; too loose leads to slow leaks. The values come from the system manufacturer, the spanner sizes follow the line size.
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All torque wrenches in the range (19 items)
What matters when choosing
- Matching spanner sizes What is meant are the spanner sizes for pipe sizes 1/4", 3/8", 1/2" and 5/8", plus 3/4" on larger systems. Check whether the set covers the sizes on your systems, not only the nominal torque values.
- Preset or adjustable Wrenches preset per size are quick on site and cannot be adjusted by accident. An adjustable wrench is more flexible when manufacturer values differ from the standard figures, but has to be set every time.
- A cleanly defined break point The wrench has to break noticeably before the flare takes damage. Look at the stated accuracy and at whether the break point can be felt clearly in an awkward position too.
- Keep calibration in view A torque wrench is a measuring instrument. After long use, after a drop, or if it has been stored permanently under tension, the value drifts. Anyone using it to back up a warranty should keep to the manufacturer test interval.
Refrigerant and safety group
Frequently asked questions
Which torque for which flare nut?
The installation manual of the system always governs. The values differ noticeably between manufacturers. As orientation: the larger the line, the higher the torque; from 1/4" to 5/8" it rises several times over. If you work without the manual, look it up rather than guess.
Would an ordinary spanner not do?
For holding back, yes; for tightening, no. Incorrectly tightened flare connections are a classic cause of leaks, in both directions. At this point the torque wrench is the tool with the best ratio of cost to trouble avoided.
How do I store a torque wrench properly?
Wind adjustable wrenches back to the lowest value after use so the spring is not left permanently tensioned. Do not use it to loosen fittings or as a striking tool; that costs accuracy.