- Has SJSII, designed to reduce vibration felt by the user
- SJSII Technology Reduces Vibration for User Comfort
- Tool has a 1-year limited warranty from date of purchase
- See More Details
Frequently Bought Together
Price:
$19900
Product Overview
The Makita 5 in. SJS II High Power Angle Grinder (GA5042C) combines power, convenience, comfort and motor-protection features for longer-lasting industrial performance. It is ideal for cutting, grinding ferrous metal, paint and rust removal, shipyard maintenance, metal polishing, general steel grinding, auto repair work, cutting brick and masonry, restoration work and more. The GA5042C is equipped with SJS II, a mechanical gear drive system to help prevent motor and gear damage by dampening the force on the gear when the wheel is forced to stop. SJS II is also features a leaf spring and cam gear drive mechanism that is engineered to reduce vibration for increased operator comfort during extended use. The 12 Amp motor delivers 2,800-11,000 RPM for versatility and maximum productivity. Labyrinth construction protects the motor with a complex set of channels, prohibiting dust and contamination from entering the motor. Additional protection features include a Zig-zag epoxy applied to both sides of the armature coil and a powder-coating to the field. This forms a barrier under rotation and is engineered to protect from dust and debris penetration for longer tool life.
- California residents
- SJS II provides a mechanical gear drive system to help prevent motor and gear damage by dampening the force on the gear when the wheel is forced to stop
- SJS II provides a leaf spring and cam gear drive mechanism that is engineered to reduce vibration for increased operator comfort during extended use
- Vibration absorbing side handle provides increased comfort on the job
- Electronic controller provides constant speed control which automatically applies additional power to the motor to maintain speed under load
- Electronic controller provides soft start which suppresses start-up reaction for smooth start-ups and longer gear life
- Electronic controller provides an electronic current limiter which helps protect the motor from overload
- Variable speed control dial enables user to match the speed to the application
- Labyrinth construction seals and protects the motor and bearings from dust and debris for longer tool life
- Zig-zag varnish protects the armature coil from dust and debris for longer tool life
- Spiral bevel gears for smoother rotations and a more efficient transfer of energy
- Tool-less wheel guard for easy adjustment
- Slide switch with lock-on for continuous use
- Shop all Makita products
- Click here for more information on Electronic Recycling Programs
Product Overview
- Has SJSII, designed to reduce vibration felt by the user
- SJSII Technology Reduces Vibration for User Comfort
- Tool has a 1-year limited warranty from date of purchase
Compare Similar Angle Grinders
 | |  |  | |
| Brand | Makita | Makita | Makita | Makita |
| Name | 12 Amp 4-1/2 in. SJS II High-Power Angle Grinder | 12 Amp 5 in. SJS II High-Power Angle Grinder | 18- -Volt 5.0Ah LXT Lithium-Ion Brushless Cordless 4-1/2 in. /5 in. Paddle Switch Cut-Off/Angle Grinder Kit | 18-Volt 5.0Ah LXT Lithium-Ion Brushless Cordless 4-1/2 / 5 in. Cut-Off/Angle Grinder Kit |
| Price | $16551 | $19900 | $31039 | $42684 |
| Ratings | (15) | (7) | (8) | (251) |
| Cordless/ Corded | Corded | Corded | Cordless | Cordless |
| Wheel Diameter (in.) | 4.5 | 5.0 | 5 | 5 |
| Power Tool Features | Adjustable Handle Position,Grinding Wheel Included,Lock On Switch,Second Handle Included,Spindle Lock,Variable Speed | Adjustable Handle Position,Grinding Wheel Included,Lock On Switch,Second Handle Included,Spindle Lock,Variable Speed | Bag Included,Grinding Wheel Included,Spindle Lock | Bag Included,Grinding Wheel Included,Lock On Switch,Spindle Lock |
| Amperage (amps) | 12 | 12 | 0.0 | 0.0 |
| Voltage (volts) | 18 | 18 | ||
| Battery Amp Hours | 5 Ah | 5 Ah | ||
| Motor Type | Brushless | Brushless | ||
| View Product | View Product | View Product | View Product |
Compare Similar Angle Grinders
| | | | |
| Brand | Makita | Makita | Makita | Makita |
| Name | 12 Amp 4-1/2 in. SJS II High-Power Angle Grinder | 12 Amp 5 in. SJS II High-Power Angle Grinder | 18- -Volt 5.0Ah LXT Lithium-Ion Brushless Cordless 4-1/2 in. /5 in. Paddle Switch Cut-Off/Angle Grinder Kit | 18-Volt 5.0Ah LXT Lithium-Ion Brushless Cordless 4-1/2 / 5 in. Cut-Off/Angle Grinder Kit |
| Price | $16551 | $19900 | $31039 | $42684 |
| Ratings | (15) | (7) | (8) | (251) |
| Cordless/ Corded | ||||
| Wheel Diameter (in.) | ||||
| Power Tool Features | ||||
| Amperage (amps) | ||||
| Voltage (volts) | ||||
| Battery Amp Hours | ||||
| Motor Type | ||||
| View Product | View Product | View Product | View Product |
Specifications
Dimensions
Product Depth (in.)
11.87
Product Height (in.)
4.56
Product Width (in.)
5.5
Wheel Diameter (in.)
5.0
Details
Amperage (amps)
12
Arbor Size
5/8" - 11 UNC
Color Family
Teal
Condition
New
Cord Length (ft.)
8.2
Corded Tool Type
Angle Grinder
Cordless/ Corded
Corded
Electronic Speed Control
Yes
Grinding Wheel Included
Yes
Maximum Speed (rpm)
11000
Power Tool Features
Adjustable Handle Position,Grinding Wheel Included,Lock On Switch,Second Handle Included,Spindle Lock,Variable Speed
Product Weight (lb.)
5.4
Returnable
180-Day
Spindle Lock
Yes
Tools Product Type
Power Tool
Variable Speed
Yes
Warranty / Certifications
Certifications and Listings
UL Listed
Manufacturer Warranty
1-year warranty
Questions & Answers
4Questions7Answers
Can this be used as a polishing wheel also .
Asked by whatever42 November 8, 20172
AnswersPolishing what? I have several polishers, and I would never think of using this to polish. But when it comes to grinding it is the best.
Could we adjust the speed?
Asked by Nature June 19, 20192
AnswersThank you for your question. Yes, the GA5042C 5" SJS™II High-Power Angle Grinder is equipped with a variable speed control dial enables user to match the speed to the application.
Besides the wheel dia., what are other differences between GA4542C and GA5042C? Thank you
Asked by John December 27, 20192
AnswersThank you for your question. The difference between the GA4542C 4-1/2" SJS™II High-Power Angle Grinder and the GA5042C 5" SJS™II High-Power Angle Grinder is the size of the wheel diameter.
What is the arbor size? The specs here say 5.0 which I'm assuming is actually the max disc diameter.
Asked by John April 25, 20191
AnswerThank you for your question. The GA5042C 5" SJS™II High-Power Angle Grinder has a 5/8" - 11 UNC spindle thread.
Customer Reviews
Overall Ratings
great tool!!!
June 25, 2019
great tool!!!
My 30-year-old 4.5” Makita died in the middle of a...
March 6, 2019
My 30-year-old 4.5” Makita died in the middle of a project. I purchased a Bosch which seemed to be the best my local HD was offering. Not good. I ordered this on line. It is great. Powerful, smooth, relatively quiet. Reliable. Ergonomic. Can’t say enough how much I like it.
Great grinder!
November 6, 2018
Great grinder!
Grinder is smooth with less vibration that other grinders I...
December 5, 2017
Grinder is smooth with less vibration that other grinders I have used. It can cut 1/4” steel quickly as well as light sanding or blending. I purchased this grinder from HD because they offer an extended warranty. Past grinders only lasted 2 years tops.
I bought this grinder because of the variable speed adjustment and I'm glad I did. Different grin...
August 26, 2017
I bought this grinder because of the variable speed adjustment and I'm glad I did. Different grinding and polishing wheels have ideal RPM levels or limits and cheaper grinders may exceed limits or dance across a work piece and damage it. I needed to grind porcelain tile and found the mid range setting on this powerful grinder to be much more predictable than any I had used before. It just does not bog down at all.
The on-off switch easily locks on for extended grinding. I tried a diamond cupping wheel, polishing flap style disk and a 4.5" diameter diamond cutting blade. The Makita played well with all of them. This is something you need in your toolbox.
Upgraded to this one to do grout removal and the extra amperage works great compared to the previ...
April 19, 2017
Upgraded to this one to do grout removal and the extra amperage works great compared to the previous 4.5" one I had before.
Makita makes great tools!
October 18, 2016
This grinder is solid and high quality like other Makita tools we've purchased. It is a little on the heavy side because the motor is 12 amp. Considered buying a paddle switch model, but bought this one because of the variable speed. The speed feature is huge for me and something I don't want to do without after having had it with other tools. As a service plumber, I use this to cut soft metal like brass and don't want to be under a sink with a grinder going over 10k rpm. If you're grinding heavy steel everyday, perhaps you could care less and will have it on full speed all the time, but I really like the variable speed. Not the cheapest grinder, but I gave up on cheap tools years ago; you should to!
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