Cordless Angle Grinders for Sale? How to choose the best Angle Grinders

Last updated: September 18, 2024

Cordless angle grinders are indispensable tools for professionals and DIY enthusiasts, offering freedom from cords and the flexibility to work in tight or remote spaces. With many options available, choosing the best cordless angle grinder can be daunting. Here’s a guide to help you make an informed decision.

Table of Contents

Power and Performance

Voltage Matters

The voltage of a cordless angle grinder indicates its power. Most models range from 18V to 54V. Higher voltages typically provide more power and can handle tougher jobs. An 18V grinder offers a good balance of performance and portability for general use, while 40V or 54V models are better for more demanding tasks.

Motor Power

Look at the motor’s wattage or power rating. Higher wattage generally translates to more robust performance, allowing the grinder to tackle heavier grinding, cutting, and polishing tasks efficiently.

Battery Life and Charging

Battery Capacity

The battery’s capacity, measured in amp-hours (Ah), impacts how long you can use the grinder before recharging. Batteries with higher capacities, like 4.0 Ah or 5.0 Ah, provide longer runtimes and are ideal for extended work sessions.

Charging Time

Faster charging times are crucial for minimising downtime. Some models come with quick-charging features that significantly reduce the wait time between uses.

Disc Size and Compatibility

The grinder size is usually based on the application and compatibility of discs. If you choose a 115mm/4 ½“Grinder, you will be able to use 115mm discs, which are recommended for maximum safety and power tool efficiency!

Disc Diameter

Common disc sizes include 115mm and 125mm. Larger discs allow for deeper cuts and more substantial grinding but may need to be more manoeuvrable. Choose the size that best fits the type of work you’ll be doing.

Disc Compatibility

Ensure the grinder supports the types of discs you need, whether for cutting, grinding, or polishing. Some grinders come with tool-free guard adjustments, making it easier to switch out discs as needed.

Check our Abrasive Discs Range

Ergonomics and Design

Comfort and Handling

Features like ergonomic handles and adjustable side grips enhance comfort and reduce fatigue during extended use. A well-designed handle is crucial for ease of operation.

Weight

Lighter grinders are easier to handle, especially for prolonged tasks. However, ensure the weight doesn’t compromise the power needed for your work.

Safety Features

Safety Feature	Purpose	Feature Description
Safety Guard	Protects user from debris, sparks, and disc fragments	Adjustable guard covering half of the disc; should never be removed or disabled.
Spindle Lock	Allows safe and easy disc changes	A button or switch locks the spindle in place during disc changes, minimising injury risk.
Anti-Restart Function	Prevents accidental restarts after power interruption	Ensures the tool does not automatically turn back on after power loss, avoiding accidents.
Dead Man’s Switch	Stops the grinder if the user loses control	A trigger or paddle switch that requires constant pressure to keep the tool running, automatically shutting off if released.
Electronic Brake	Stops the disc quickly after turning off	The mechanism reduces the disc’s stopping time, preventing injuries from a spinning disc.
Soft Start	Reduces torque on startup	Gradual acceleration when starting the tool, providing more control and reducing kickback.
Overload Protection	Prevents overheating and tool damage	Shuts off the tool if it overheats or the motor is overloaded, extending tool life and preventing accidents.
Dust Protection	Protects internal components from dust	Sealed components, vents, and bearings are designed to block dust infiltration that can damage the tool and cause malfunction.
Vibration Reduction	Reduces user fatigue and improves comfort during prolonged use	Anti-vibration handles or damping mechanisms are built into the tool to lessen vibration.
Auxiliary Handle	It provides better grip and control	A detachable side handle that can be mounted on either side for better control, especially during heavy-duty tasks.

This table summarises the key safety features of angle grinders!

Brand and Warranty

Branded tools like Makita, DeWalt, Milwaukee and many more are recognised for their superior quality, reliability, and comprehensive support, making them invaluable to professionals and DIY enthusiasts. These brands invest in stringent quality control to ensure their tools meet high standards for performance and durability, providing users with dependable results in demanding tasks. Warranties and customer support services enhance their value, offering peace of mind and assistance when needed. Additionally, these tools are designed for compatibility with a wide range of accessories and parts while incorporating innovative features that improve efficiency and versatility. Although branded tools may come with a higher initial cost, their long-term value, durability, and ease of maintenance make them a worthy investment.

Applications

Angle grinders are among the most versatile power tools available! Typically offered in various sizes, with the most popular being 115mm, 125mm, and 230mm, their design enables users to switch attachments and tackle a wide range of tasks. These tools can easily handle numerous applications, from cutting through steel and concrete to polishing surfaces and removing rust. Here are some common uses:

Cutting bars, rods and bolts

Angle grinders are highly effective for cutting through bars, rods, and bolts. With the appropriate cutting disc, these tools can swiftly slice through metal materials like steel and iron, making them ideal for trimming rebar, shortening rods, or removing stubborn bolts during construction, repair, or demolition work.

Concrete, stones and tiles

Angle grinders with diamond blades are excellent for cutting through concrete, stones, and tiles. They are commonly used for tasks such as trimming tiles, shaping stones, or making precise cuts in concrete for construction and renovation projects. Their versatility allows for smooth, clean cuts in hard materials, making them ideal for heavy-duty construction and delicate tile work.

Grinding and Sharpening

Angle grinders are perfect for grinding and sharpening tasks. Equipped with a grinding disc, they can smooth rough metal edges, remove welds, and shape materials. For sharpening, angle grinders are commonly used to sharpen tools like lawnmower blades, axes, and chisels, restoring their cutting edge with precision. This makes them invaluable for both metalwork and tool maintenance.

Metal Cleaning

Angle grinders are highly effective for cleaning metal surfaces. Fitted with wire brush attachments or flap discs, they can remove rust, old paint, corrosion, and grime from metal objects. This makes them ideal for preparing metal surfaces for welding, painting, or refinishing, ensuring a clean and smooth surface is ready for further work.

Preparation and Polishing

Angle grinders are versatile tools for preparation and polishing tasks. They can grind and smooth surfaces for preparation, such as removing old coatings, cleaning concrete, or shaping materials. When polishing, angle grinders equipped with polishing pads or compounds can achieve a high-gloss finish on metals, stones, and other surfaces. This dual functionality makes them essential for achieving a clean, prepared surface and a professional-quality polished look.

Check our Diamond Blades Range

Corded vs. cordless Angle Grinders

When choosing between corded and cordless angle grinders, it’s important to consider the specific needs of your project and work environment. Here’s a comparison to help you decide:

Corded Angle Grinders

Advantages

Consistent Power: Provides uninterrupted power for extended use and heavy-duty tasks.
Higher Performance: They generally offer higher torque and RPM than cordless models, making them better suited for tough jobs.
No Battery Limitations: This eliminates concerns about battery life or charging times as long as access to a power outlet is available.

Disadvantages

Limited Mobility: Restricted by the length of the power cord, which can limit movement and access to certain areas.
Cord Management: The cord can get in the way and may be prone to tangling or damage.