Makita GA5020 SJS Angle Grinder 5 in
- 10.5 AMP motor, 11,000 RPM
- SJS clutch slips if the wheel binds
- Electric brake
- Rear trigger, no lock-on
- Tool-less wheel guard, side handle, 36 grit wheel included
- 120 V, 1260 W
- 1-year warranty
Last refreshed Jun 24, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A tough corded grinder for fabricators and contractors who want gear protection when a wheel catches. The rear trigger without lock-on adds control but tires the hand on long cuts.
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ASIN: B002BA5YNKModel: GA5020Category: Angle Grinders
Overview
Makita builds this grinder around its Super Joint System, a mechanical clutch that lets the drive shaft slip if the wheel jams, sparing the gears. An electric brake stops the wheel quickly, and labyrinth seals shield the motor and bearings from grit.
Clutch protection and dust sealing aim at long service life in metal shops and on job sites. The trigger has no lock-on, and the weight differs between the specs and the description.
Who it's for
Metal workers, welders and tradespeople who grind, cut and finish steel often. Occasional DIY users may not need the clutch and brake.
Pros and cons
- Clutch protects the gears
- Electric brake stops the wheel
- Sealed against dust
- Tool-less guard adjustment
- No lock-on switch
- Weight listed two ways
Performance notes
If the wheel catches, the clutch slips instead of passing the shock to the gears, which reduces kickback strain. Labyrinth seals keep grinding dust out of the motor, a common cause of early failure.
Specifications
| Brand | Makita |
|---|---|
| Model | GA5020 |
| Dimensions & fit | |
| Wheel Diameter | 5 inches |
| Item weight | 5 pounds (description says 5.9) |
| Item Dimensions L X W X H | 14"L x 1"W x 1"H |
| Capacity & performance | |
| Maximum Rotational Speed | 11000 RPM |
| Wattage | 1260 watts |
| Power & efficiency | |
| Voltage | 120 Volts |
| Amperage | 10.5 A |
| Power Source | Corded Electric |
| Construction & materials | |
| Color | Green,black |
| Material Type | Zirconia |
| Included components | |
| Included Components | 5 inch tool-less wheel guard, 5 x 1/4 x 7/8 inch 36 grit grinding wheel, inner flange, lock nut, wrench, side handle |
| Unit Count | 1.0 Count |
| Warranty & support | |
| Manufacturer Warranty Description | 1-year warranty |
| Other details | |
| Features | SJS clutch, electric brake, labyrinth seals |
| Switch | Rear handle trigger, no lock-on |
| Item Type Name | Makita GA5020 5" SJS™ Angle Grinder, with AC/DC Switch |
| Style Name | Angled |
Frequently asked questions
How do I adjust the guard on the Makita GA5020?
It comes with a 5 inch tool-less wheel guard, so it adjusts without a wrench.
What happens if the wheel binds on the Makita GA5020?
The SJS mechanical clutch lets the drive shaft slip to help prevent motor and gear damage.
Does the Makita GA5020 have a lock-on switch?
No. It has a rear handle trigger switch with no lock-on.
What wheel comes with the Makita GA5020?
A 5 x 1/4 x 7/8 inch Inox grinding wheel, 36 grit.