Torque wrench comparison 2018

Purchase advice on the torque wrench comparison or test 2018

  • A torque wrench is mainly used in mechanical engineering. Here are glands that require a certain torque, widespread.
  • In everyday life, the torque wrench is often used for bicycles and cars. With the help of the tool, the screw is bolted with a precise torque.
  • A screw can also be over-turned. To prevent this from happening, the torque wrench provides auditory and haptic feedback in the form of clicks and clicks, which you can feel as well.

Torque wrench comparison 2018: wrench

Almost 13 million Germans describe themselves as home improvement experts (source: Statista). They give advice and tips and regularly inform themselves about certain topics. Such a hobby craftsman of course has a lot of tools at home and there must not be missing a torque wrench.

Just like the open-end wrench, ring spanner or socket wrench, the torque wrench should tighten a bolt or nut. You can, however, use this tool adjust how tight the bolt or nut should be pulledso she does not overdo. What you should look for when buying, how to use the torque wrench correctly and what types there are, we explain in our purchase advice for torque wrench 2018.

1. What is a torque wrench?

The size is what matters

Torque wrenches are available in different sizes or with different lever lengths - but maximum up to 1.50 meters. Of course, this would be way too long for working on a two-wheeler. Here a device of maximum 30 cm is sufficient. If you work on the car, then you need already a length of about 45 cm, so that the force is not too big.

The torque wrench is mainly used in mechanical engineering to tighten bolts and nuts at a specific torque. In aerospace engineering, medicine or assembly technology, it is important to provide screws with a certain clamping force. He often finds his application in everyday life Tire changes on cars or screwing on the bike.

Torque wrench comparison 2018: torque

In everyday life, the torque wrench is often used for tire replacement.

Of course, there are other tools, such as the jaw, ring or socket wrench that can tighten or loosen a screw. The torque wrench, however, ensures a precise torque. This can not be achieved with other tools. As a result, sensitive connections that are not allowed to be screwed tightly can be safely processed. The required torque is set in advance in the tool and when it is reached, you get a signal in the form of a click or click.

The best torque wrench will not work if you do not have the right attachments. Therefore, it is worthwhile to buy a nut set when buying a torque wrench to have as much choice as possible. But be careful that the nuts also fit on the torque wrench, otherwise you will not be able to use your tool properly.

1.1. Structure of the torque wrench

Torque wrench comparison 2018: 2018

A longer rod provides greater leverage to achieve higher torque with less force.

Whether mechanical or electrical - every torque wrench consists of one Ratchet head for the various attachments, a switch for the right-left run, a lever arm and a scale, on which you adjust the torque.

Most torque wrenches are rarely made with a longer lever arm than 1.50 m. The maximum tightening force is not limited by the tool, but by the power of the user. This results in most cases a maximum torque of 1500 Nm (Newton meters).

If you need a higher torque, you can use a tool with torque multipliers or grab a hydraulic screwdriver.

Danger:Never over-tighten a screw. It is believed that it is better that it is stronger than too loose, but both the screw and the material can be damaged. These damages can loosen the screw or cause the material to break and stop the screw. So be sure to pay attention to the correct torque.

1.2. Advantages and disadvantages of a torque wrench

  • Tightening nuts and bolts with precise force
  • pretty tough
  • low probability that screwing will loosen when accurate torque is used
  • Variety of plug-in attachments
  • high price for good tool
  • Nut set should be purchased separately

2. What types of torque wrenches and types are available?

Although you can choose between a mechanical and an electronic model with this tool, you still have to apply force to both. What distinguishes the two variants, you can see in the following table.

mechanical torque wrench

Torque wrench comparison 2018: 2018

electronic torque wrench

Torque wrench comparison 2018: comparison

  • recognizable trigger signal
  • Knack key: gives crackling or clicking when torque is reached; Tightening the screw should be stopped immediately
  • Torque wrench: after reaching the desired torque, the tool buckles; Force application is automatically stopped
  • slipper: Tool slips when torque is reached, preventing overcoating
  • digital display and strain gauges
  • Strips pass certain signals to the measuring amplifier
  • Measuring amplifier converts signals into the measuring unit and outputs them
  • Setting several values ​​possible

3. Purchase criteria for torque wrenches

3.1. material

Most torque wrenches in our comparison are forged from a chrome-vanadium steel alloy. Many tools are made from them today to protect them from rust and are very sturdy.

The handles are mostly off Rubber or plastic, so they fit well in your hand and you do not slip off, when you tighten the nuts and bolts. Using your own torque wrench test, you can check how the tool is in your hand and whether another might be better.

3.2. drive

Torque wrench comparison 2018: 2018

The drive of a torque wrench looks something like this.

When driving is called at a torque wrench the pin on the ratchet head, which "drives" the essay. Common inches are here 1/4 "and 1/2".

Make sure that your socket wrenches fit on this drive. Especially if you buy more nuts, you should make sure that they are also usable with the torque wrench.

3.3. torque

Depending on the area for which the torque wrench is to be used, various tightening torques should be aimed at. Car rims usually require a torque between 80 and 200 Newton meters. When cycling, 6 to 30 Nm are enough.

When changing a tire, be sure to pay attention to the manufacturer's information on torque, as the fittings for alloy wheels, for example, require a slightly lower value.

3.4. length

The length of the torque wrench should meet your needs. When you screw on your bike, a length of about 30 cm is enough. However, if you want to work on your car, we recommend at least a length of 45 cm.

Tip:The longer the torque wrench lever, the better the leverage. That is, a higher torque can be achieved even if the effort is the same.

4. How do you use a torque wrench?

Torque wrench comparison 2018: 2018

Correct use of a torque wrench also requires the correct plug-in attachments.

To really save on tire replacement costs, you need the right tool in the torque wrench category. So that the screws are not over-tightened, the tightening torques can be adjusted, so that when the desired torque is reached a sound sounds. If you hear this cracking, you should stop screwing to prevent over-tightening.

The manufacturers of the various car brands have listed the tightening torques for their vehicle models, which one must adhere to when changing tires. Especially in the automotive sector, you should be careful and in case of uncertainties such work better left to a professional before an accident occurs because of a loose screw.

5. Torque wrench comparison at Stiftung Warentest

Torque wrench comparison 2018: comparison

Make sure your tool cart has an Englishman tool of good quality.

Stiftung Warentest has not yet carried out a torque wrench test. However, in 2009 there was a message about the recall of the torque Torcofix from the manufacturer Gedore.

Here were around 250,000 products affected by a material defect, which made sure that the screws are tightened too tight or too loose.

6. Questions and answers around the topic of torque wrenches

6.1. Do I have to relax the torque wrench?

After use, the torque wrench should be relaxed, so that the spring is protected in the core. After use simply turn the torque wrench back to the lowest value, to increase the life of the tool. If the spring is permanently tensioned, it can lose tension. As a result, screws can be tightened with a wrong torque because the key is unable to accurately indicate the correct moment.

6.2. How often should the torque wrench be calibrated?

Torque wrench comparison 2018: wrench

A torque wrench needs some accessories. In order for him to live long, he should be relaxed after use.

The initial calibration of the tools is of course the manufacturer. With daily use, the torque wrench can wear out and should be recalibrated annually. Although this calibration can be expensive, but it is usually cheaper than a new tool. Most manufacturers or test centers like Dekra offer such a calibration.

6.3.How often should the torque wrench crack?

The torque wrench should crack only once, because then the desired torque is reached. The sound is not only audible, but also noticeable. If you continue to turn despite the signal, a higher tightening torque is achieved and the clamping force is no longer optimal. You can loosen the screw and readjust the torque wrench to regain torque.

6.4. How many Newton meters does a torque wrench need?

To find your personal torque wrench test winner, you should know in which area the tool is used. For the bike you need the least torque with 6 to 30 Nm. For work on the motorcycle torques between 30 and 50 Nm are recommended. Screwdriving on the motor vehicle requires between 80 and 200 Nm. For example, spark plugs need a torque of 10 to 45 Nm, but rims on a car already 80 Nm.

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Video Board: 10 Best Torque Wrenches 2018