Last updated: August 11, 2021

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Welcome to our big straight grinder test 2021. Here we present all the straight grinders we have tested in detail. We have compiled detailed background information and added a summary of customer reviews on the web.

We would like to make your purchase decision easier and help you find the best straight grinder for you. You will also find answers to frequently asked questions in our guide. If available, we also offer interesting test videos. Furthermore, you will also find some important information on this page that you should definitely pay attention to if you want to buy a straight grinder.




Summary

  • A straight grinder is the best choice for you if you want to work on metal surfaces in steel construction or in the locksmith's shop.
  • Typical tasks for the straight grinder are grinding and fettling weld seams. For continuous operation, we recommend an air-powered straight grinder.
  • A high-quality straight grinder costs between 100 and 200 euros. When buying, you should consider the performance and handling.

The best Straight Grinder: Our Picks

Guide: Questions you should ask yourself before buying a straight grinder?

What do you need a straight grinder for?

Straight grinders are mainly used for surface finishing in steel construction and locksmithery. Thanks to its small and narrow grinding head, you can also reach places that are difficult to access with this grinding tool. In addition to grinding, a typical task for the straight grinder is fettling weld seams in the locksmith's trade and in the steel industry.

But you can also use the small grinder in tool and mould making, for example to restore bending tools. Depending on the situation and the material to be treated, different grit sizes of the grinding wheels are used.

A straight grinder is often used for surface treatment in steel construction and locksmithery.(Image source: 123rf.com / guruxox)

The big advantage you can't get with any other grinder than the straight grinder is the fact that you can get to almost any hard-to-reach place with the help of its slim shape.

When is an air straight grinder the better choice?

If you are facing longer sanding jobs and want to use the straight grinder for continuous operation, we recommend the air-powered sanders. To work with an air-powered straight grinder, you need an air compressor that drives the air turbine in the grinder.

Make sure that your compressed air system has enough power to achieve optimum performance with the straight grinder. The conventional straight grinder with an electric motor, on the other hand, is more useful for occasional work and is therefore only recommended for hobby craftsmen.

What is the price of straight grinders?

Due to the large number of different straight grinders on the market, the small grinders are available in all price categories. From 30 € to 500 € you can consider numerous offers. Entry-level models with little power and extras are available for as little as 50 €.

For reliable straight grinders with high quality, you usually have to spend more than 200 €. However, there are always good deals that allow you to buy good machines for between €100 and €200. The price ultimately depends on what you want to use the straight grinder for and how. The criteria listed in the next section can also be helpful in your purchase decision.

What is the difference between a straight grinder and a stick grinder?

The following table briefly shows the differences between a stick sander and a straight grinder:

Criteria Stick grinder Straight grinder
Drive Compressed air Electric motor
Speed Up to 25000 rpm Up to 25000 rpm
Advantages Good for long and regular work Only needs a power connection
Disadvantages Compressor necessary Usually not as powerful as stick grinders

Decision: What types of straight grinders are there and which one is right for you?

Basically, straight grinders can be differentiated according to the type of energy supply. A distinction is made between three different types:

  • Straight grinder with battery
  • Mains-powered straight grinders
  • Straight grinder with compressed air

Depending on how often and for what purpose you ultimately want to use the straight grinder, features such as manageability or power should play a role in your purchase decision. These are two of the decisive criteria on the basis of which the advantages and disadvantages of the respective models are measured in the following. But other reasons for and against a model should also be taken into account so that the decision makes the most sense.

How does a battery-powered straight grinder work and what are its advantages and disadvantages?

The battery-powered straight grinder differs in design in that there is no cable or hose attached to the rear end, which promises great mobility. So if you only work sporadically with a straight grinder and do not want to be restricted in your movements by a cable or a compressor, this is the right choice.

One drawback, however, is the significantly lower power compared to the competition, but this is not really a disadvantage for occasional use. Despite everything, the device fulfils its purpose. In any case, you should find out whether the battery is included in the scope of delivery or whether the associated and often high surcharges are worth the purchase before making a purchase.

Advantages
  • Handy
  • High flexibility and mobility
Disadvantages
  • Lower performance
  • Battery must be charged
  • Battery purchase often expensive
  • Relatively heavy

How does a mains-powered straight grinder work and what are its advantages and disadvantages?

To a certain extent, this variant lies between professional use and hobby use. As a result, the largest selection of models is available here. If there is a power socket nearby, the mains-powered straight grinder has the advantage over the battery-powered version of significantly greater performance and a longer operating time.

As a rule, it also weighs a little less. Compared to the compressed air version, it is characterised by its greater flexibility. The mains-powered straight grinder thus combines some of the best features and should be worth considering for all those who often have to mill, engrave or grind something.

Advantages
  • Handy
  • Good performance
Disadvantages
  • Tangle of cables
  • Low range

How does a straight grinder with compressed air work and what are its advantages and disadvantages?

If you are considering buying an air-powered straight grinder, the first question you should ask yourself is whether a compressor is available. Without this compressor, unfortunately, there is no compressed air. However, depending on the quality - which also determines the performance of the straight grinder - these devices can cost several hundred euros.

Furthermore, a compressor restricts your mobility somewhat, as you cannot take it with you for short jobs. That's why you are always tied to one place. However, all this should not distract you from the positive features. For people who work often and a lot with the straight grinder, this version definitely has its advantages. Particularly noteworthy are the high performance and the low weight (approx. 400 grams, compared to the approx. two-kilogram devices for battery and mains operation).

Advantages
  • High performance
  • Easy to hold
Disadvantages
  • Tied to compressor
  • Expensive

Buying criteria: Use these factors to compare and rate straight grinders

In the following, we show you which criteria you can use to compare and evaluate straight grinders. This will make it easier for you to get an overview and decide on a suitable straight grinder. In summary, these are the following criteria:

  • Power
  • Handling

In the following, you can read about the respective criteria and find out why it makes sense for you to purchase a straight grinder under these aspects or not.

Performance

The most important purchase criterion for technical tools is the performance of the machine. It is also worth taking a look at the wattage and speed of a straight grinder. We recommend that you buy a straight grinder with more than 500 watts if you want to be able to do all grinding work and weld seams without any problems.

If your work is more delicate, a power of up to 500 wat ts is perfectly adequate. Depending on the model, straight grinders can reach an idle speed of 5000 to 100,000 revolutions per minute. The high speeds are usually compressed air straight grinders. You can also get many self-regulating speed devices on the market.

The same applies to the wattage as to the speed: the more, the better.

Handling

In order to make your sanding work as easy and pleasant as possible, good handling of the hand-held power tool is a prerequisite. The housing of the straight grinder should be stable and the handle comfortable to hold. You should also make sure that the operating handle is easily accessible for you to ensure smooth work. We also recommend that you look at the manufacturer's specifications regarding a quick change of grinding tools and the operation of the locking system before buying.

Image source: 123rf.com / 91866402

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