16.8V / 21V19,500 RPM3″ Mini Angle Grinder
3 in disc · 2 x 2.0 Ah batteries
7 colors
4.0 out of 5 · 1,165 ratings
from $26.99
Tool Up on AmazonGrinders and cut-off tools
Cut bolts and rod, clean welds, trim tile and drywall. We sell all three cordless tools as kits, so you get batteries, a charger and discs with each one.
3 tools9 optionsfrom $26.99

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3 tools
16.8V / 21V19,500 RPM3 in disc · 2 x 2.0 Ah batteries
7 colors
4.0 out of 5 · 1,165 ratings
from $26.99
Tool Up on Amazon
21V20,000 RPM3 in disc · 2 x 4.0 Ah batteries
3.4 out of 5 · 32 ratings
$71.98
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21V8,500 RPM4-1/2 in and 5 in disc · 2 x 4.0 Ah batteries
4.7 out of 5 · 20 ratings
$76.49
Tool Up on AmazonNot sure which grinder or disc fits your job? Mini grinder vs 5-inch grinder
Side by side
All three are cordless and come with two batteries. They differ in disc size, speed and how you hold them.
| Compared | 3″ Mini Angle Grinder | 5″ Brushless Angle Grinder | 3″ Mini Circular Saw |
|---|---|---|---|
| Power | Cordless | Cordless | Cordless |
| Voltage or motor | 16.8 V or 21 V, by version | 21 V brushless | 21 V brushless, 450 W |
| Top speed | 19,500 RPM | 8,500 RPM | 20,000 RPM |
| Disc, bit or blade | 3 in | 4-1/2 in and 5 in | 3 in |
| Batteries | 2 x 2.0 Ah | 2 x 4.0 Ah | 2 x 4.0 Ah |
| Options | 7 | 1 | 1 |
| Buyer rating | 4.0 out of 5 · 1,165 | 4.7 out of 5 · 20 | 3.4 out of 5 · 32 |
| Price | from $26.99 | $76.49 | $71.98 |
| Better choice when | You cut in tight places with one hand, at 19,500 RPM | You grind welds and rust and want 4-1/2 or 5 in discs | You want a straight, shallow cut with a base and a depth stop |
Best TEENO pick for…
For bolts and threaded rod
A 3 in cut-off disc at 19,500 RPM fits around a bolt head where a big grinder will not.
from $26.99
For welds and rust
It takes 5 in grinding and flap discs, has three speeds and stops the wheel with an auto-brake when you let go.
$76.49
For drywall and thin tile
The plunge base and the 1/2 in depth stop keep the cut straight and shallow, and the dust port takes a shop vac.
$71.98
Other ways to cut metal
A 3-inch mini grinder like the 3″ Mini Angle Grinder cuts bolts and rod in seconds with one hand. A full-size 4-1/2 or 5-inch grinder reaches deeper and grinds wider. A hacksaw is quiet and sparkless, but slow.
| Compared | Mini grinder, 3 in | Grinder, 4-1/2 or 5 in | Hacksaw |
|---|---|---|---|
| Disc or blade | 3 in disc | 4-1/2 or 5 in disc | 10 or 12 in blade |
| How you hold it | One hand | Two hands, side handle | Two hands |
| Sparks and noise | Yes | Yes | No |
| Better choice when | The cut is small or in a tight spot | You grind welds or cut thick stock | Sparks are not allowed or you have no power |
Questions
At least 19,500 RPM, the top speed of the 3″ Mini Angle Grinder. The 6 discs in the kit are made for it. Check the rating printed on any disc you buy later.
Yes. The 5″ Brushless Angle Grinder takes 4-1/2 in and 5 in discs on its 5/8″-11 spindle with a 7/8″ arbor.
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