ToolsArmenia Knowledge Base

Choosing Handheld Power Tools: Frequently Asked Questions (FAQ)

Which tool suits the job, how should power, rotational speed, torque and impact energy be compared, and what should be checked before purchase? This practical FAQ provides clear answers to the questions most often asked when choosing corded handheld power tools.

Reading time: about 15 minutesUpdated: July 2026ToolsArmenia Editorial Team

What should be established before comparing tool models?

The right choice begins with the job, not with watts or price. “I need a tool for home use” is not specific enough: home projects may involve driving screws into wood, drilling metal, boring concrete, cutting tile or breaking a wall. Each operation requires a different tool design, operating mode and accessory.

What operation will you perform?

Define the task: drilling, driving, cutting, grinding, demolition, mixing or another operation.

Which material?

Wood, metal, brick, concrete, stone and ceramic require different tools and accessories.

What size?

Specify the required hole, fastener, disc or cut diameter and depth.

How often?

Occasional work lasting a few minutes and prolonged daily use require different tool classes.

Practical ruleBefore viewing models, describe the task in one line: material + operation + size + duration + frequency of use.

How can you determine which type of tool is required?

A similar appearance does not mean an identical purpose. A conventional drill, a percussion drill and a rotary hammer can all make holes, but their impact mechanisms, permitted loads and efficient applications differ. Likewise, an angle grinder does not become a circular saw, and a drill does not become a construction mixer merely because a similar-looking accessory has been fitted.

Main task	Usually the correct tool	What to verify
Holes in wood and metal	Corded drill	Chuck capacity, speed control and permitted drilling diameter.
Occasional drilling in brick or light masonry	Percussion drill	Material, hole diameter and volume of work.
Repeated drilling in concrete	SDS Plus rotary hammer	Impact energy, operating modes and permitted bit diameter.
Heavy demolition	Demolition hammer	Impact energy, attachment system, weight and vibration.
Cutting and grinding	Angle grinder or a specialised cutting or grinding tool	Disc diameter, speed, guard and workpiece material.

ImportantThe presence of an operating mode does not mean the tool is designed to perform that work continuously or under heavy load. Always verify the intended use stated by the manufacturer.

How should the main technical specifications be read?

Technical data must be considered together. A large number alone does not guarantee fast, accurate or safe work. High speed may be useful with a small drill bit, for example, but a larger diameter or higher resistance also requires sufficient torque and suitable gearing.

Specification	What it indicates	How to use it when choosing
Power, W	The rated electrical input power drawn from the mains.	Compare tools of the same type while also considering design and workload.
Rotational speed, rpm	The number of spindle revolutions per minute.	Match it to the material, accessory size and operation.
Torque, N·m	The rotational effect available at the spindle.	Assess it for driving, drilling or mixing against high resistance.
Impact energy, J	The energy transferred by each impact.	Compare rotary and demolition hammers with regard to material and workload.
Impact rate	The number of impacts delivered per minute.	Do not confuse it with energy per impact: both affect the character of the work.

The correct comparison methodCompare only tools of the same type, intended purpose and similar class. Directly comparing wattage or maximum values across different types of tool can be misleading.

What should you know about chucks, SDS and HEX systems?

The attachment system determines which accessory can be fitted directly and what type of work the tool is designed to withstand. Choosing the wrong system may require adapters, remove access to certain operating modes or make the required accessory impossible to use.

Keyless chuck allows rapid changing of drill bits and driver bits within the permitted diameter range.
Keyed chuck is tightened using a separate key and requires correct, even clamping.
SDS Plus is widely used on light and medium rotary hammers for drilling and limited chiselling.
SDS Max is intended for heavier rotary hammers, larger bits and more intensive work.
HEX is often used on demolition hammers and specialised tools subjected to high loads.
Disc mounting must match the spindle, guard and maximum permitted tool size.

An adapter is not always the solutionAn adapter can alter working length, accuracy and permitted operating modes. Use one only when the manufacturer explicitly permits the particular combination.

When should you choose a DIY tool and when a professional tool?

The difference between DIY and professional classes is not limited to power or appearance. Intended operating duration, repeated load, cooling, component durability, serviceability and the cost of downtime are also important.

DIY class

A rational choice for occasional, short and comparatively light work when simplicity, low weight and a justified price are priorities.

Semi-professional class

Suitable for periodic medium loads when the operating limits of the exact model match the task.

Professional class

Required for daily, repetitive or production work when consistent performance, service support and minimum downtime matter.

Overspecification

A heavier and more expensive tool is not always advantageous: it can reduce control during precise or overhead work.

Why are weight, ergonomics and safety technical specifications?

A tool should be assessed in working condition, with its accessory, side handle, guard and cable fitted. A seemingly small difference in weight can significantly affect fatigue and control during prolonged or overhead work.

The handle should allow stable control and a natural wrist position.
The switch, reverse control and speed adjustment should be accessible without a hazardous change of grip.
The cable should have adequate length and flexibility, and its entry point should be protected against repeated bending.
Check the guard, side handle, safety clutch, soft start and restart protection as appropriate to the tool type.
Vibration and noise data matter not only for comfort but also for acceptable working duration.

Safety boundaryProtective systems do not replace the manufacturer’s instructions, the correct accessory, the required guard or personal protective equipment.

What should be checked before buying a specific model?

Models with the same tool name or the same power rating can have different included equipment, operating limits and service conditions. Make the final choice only after checking the technical documentation for the exact model.

Confirm the rated data

Check voltage, mains frequency, power, speed, operating modes and permitted accessory sizes.

Verify the actual package contents

Establish whether the side handle, guard, chuck key, depth stop, mounting spanners and case are included.

Check compatible accessories

Verify the attachment system, size, permitted speed and material application.

Assess service support

Check the warranty, service-centre availability, spare parts and repair conditions.

Calculate the total cost

Add the cost of necessary accessories, consumables, PPE and potential service to the tool price.

Final checklist: are you ready to choose?

The material and operation have been clearly defined.
The correct type of tool has been selected for the task.
Power, speed, torque or impact energy are sufficient without being unnecessarily excessive.
The chuck or attachment system matches the required accessory.
The permitted tool sizes and operating modes will not be exceeded.
The working weight and handle suit the intended working position.
Protective systems and PPE match the risks of the work.
Warranty, service and spare parts are available.
The total cost of use, not only the purchase price, has been calculated.
The final data have been verified in the manufacturer’s documentation for the exact model.

Brief conclusionThe best tool is not the most powerful or the most expensive. It is the model whose type, operating limits, accessories, control and service support match your actual task.

Frequently asked questions

Can a tool be selected using wattage alone?

No. Wattage indicates rated electrical input power, but it does not fully describe torque, speed, mechanical efficiency, cooling or performance under load.

Does a higher speed always mean faster work?

No. The required speed depends on the material, operation and accessory diameter. Larger accessories or greater resistance often require lower speed and sufficient torque.

Can a percussion drill replace a rotary hammer?

It may be adequate for small, occasional holes in light masonry. For repeated drilling in hard concrete, an SDS rotary hammer is generally more efficient and better suited to the task.

Are SDS Plus and SDS Max accessories interchangeable?

No. They are not directly interchangeable because their sizes and designs differ. Select an accessory that matches the tool’s attachment system and avoid unapproved adapter solutions.

Is greater impact energy always better?

No. A higher joule rating is useful for heavy work but usually increases the size and weight of the tool. Impact energy should match the material, hole size or demolition volume.

Can a DIY tool be used for prolonged work?

Only within the duty pattern and rest intervals specified by the manufacturer. Repeated heavy loading calls for a tool of the appropriate class with suitable cooling.

How should tool weight be compared?

Compare working weight with the side handle, guard and typical accessory fitted. The stated weight of the bare tool does not always represent the actual load during use.

Can a larger-diameter accessory be fitted to the tool?

Only when the size is within the limits permitted by the manufacturer and matches the chuck, spindle and guard. Exceeding the limit can damage the tool and create a safety hazard.

Why is the accessory’s maximum permitted speed important?

If the accessory’s permitted speed is lower than the tool’s operating speed, it can be damaged or break apart during use. Its rating must at least match the tool’s working speed.

Are soft start and a safety clutch essential?

They are not required on every tool, but they can significantly improve control and reduce certain risks. Their importance depends on tool type, power and working conditions.

Is the most expensive tool always the best choice?

No. Price should be assessed together with suitability, design, included equipment, warranty and service support. Paying for capabilities that will not be used provides no practical advantage.

What is the most important final check before purchase?

Confirm that the exact model’s intended use, permitted accessories, operating limits and safety requirements match the work you actually need to perform.

Next article: How to choose handheld power tools: final checklist and conclusion.