Bosch HD21-2

Bosch HD21-2

Bosch HD21-2 review: specs and price

Bosch HD21-2

Why is Bosch HD21-2 better than the average?

  • Height

  • Voltage

  • Chuck diameter

  • Hammering speed

  • Maximum drilling speed

  • Amperage


Price comparison

General info

1.Is a hammer drill
Bosch HD21-2
A hammer drill contains a hammer clutch or a hammer-like mechanism which provides a circular rotation and a forward driving force. A hammer drill is capable of performing heavy-duty tasks, but it can also be used as a regular power drill.
2.Is reversible
Bosch HD21-2
A reversible drill can alter its rotations from a clockwise direction to a counter clockwise direction, a feature that makes it suitable for both drilling and driving.
The height represents the vertical dimension of the product. We consider a smaller height better because it assures easy maneuverability.


The width represents the horizontal dimension of the product. We consider a smaller width better because it assures easy maneuverability.


We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.
A drill with a pistol grip handle is usually compact and lightweight, making the tool suitable for a large variety of apps and easy to use.
A long cable ensures more freedom of movement.
When covered under the manufacturer’s warranty it is possible to get a replacement in the case of a malfunction.


The chuck holds the drill bits or other rotary tools and its diameter determines the types of bits and tools that the drill can use. A larger chuck is compatible with a wider range of bits and tools.


A tool/machine with a higher voltage produces more power.
The hammering action provides short, rapid hammer thrusts that make drilling faster and easier. The hammering action is measured in blows/beats per minute (bpm) when the drill has no-load.
Higher speeds work better for drilling holes in certain types of material, such as steel, aluminium, concrete, etc. The drill speed is measured in rotations per minute (rpm) when the drill has no-load.
4.Has variable speed
Bosch HD21-2
A drill with variable speed allows you to switch between low and high speeds, giving you the possibility to take on a wider range of tasks.


The amperage is the strength of an electric current, and it is measured in amperes (amps).

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