- Has SJSII, designed to reduce vibration felt by the user
- SJSII Technology Reduces Vibration for Operator Comfort
- Tool has a 1-year limited warranty from date of purchase
- See More Details
Frequently Bought Together
Price:
$18900
Product Overview
The Makita 4-1/2 in. SJS II High Power Angle Grinder (GA4542C) 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 GA4542C 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.
- Powerful 12.0 Amp motor delivers more output and variable (2,800 - 11,000) RPM
- 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
- 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
- California residents
Product Overview
- Has SJSII, designed to reduce vibration felt by the user
- SJSII Technology Reduces Vibration for Operator Comfort
- Tool has a 1-year limited warranty from date of purchase
Compare Similar Angle Grinders
 | |  |  | |
| Brand | Makita | Makita | Makita | Makita |
| Name | 13-Amp 6 in. Cut-Off/Angle Grinder | 12 Amp 4-1/2 in. SJS II High-Power Angle Grinder | 9 in. Angle Grinder | 10 Amp SJS II Angle Grinder with 5 in. Tuck Point Guard |
| Price | $17900 | $18900 | $18900 | $25900 |
| Ratings | (27) | (16) | (9) | (5) |
| Cordless/ Corded | Corded | Corded | Corded | Corded |
| Wheel Diameter (in.) | 6 in | 4.5 | 9 in | 5 |
| Power Tool Features | Grinding Wheel Included,Lock On Switch,Second Handle Included,Variable Speed | Adjustable Handle Position,Grinding Wheel Included,Lock On Switch,Second Handle Included,Spindle Lock,Variable Speed | Adjustable Handle Position,Spindle Lock | Adjustable Handle Position,Grinding Wheel Included,Lock On Switch,Second Handle Included,Spindle Lock,Variable Speed |
| Amperage (amps) | 13 | 12 | 15 A | 10 |
| View Product | View Product | View Product | View Product |
Compare Similar Angle Grinders
| | | | |
| Brand | Makita | Makita | Makita | Makita |
| Name | 13-Amp 6 in. Cut-Off/Angle Grinder | 12 Amp 4-1/2 in. SJS II High-Power Angle Grinder | 9 in. Angle Grinder | 10 Amp SJS II Angle Grinder with 5 in. Tuck Point Guard |
| Price | $17900 | $18900 | $18900 | $25900 |
| Ratings | (27) | (16) | (9) | (5) |
| Cordless/ Corded | ||||
| Wheel Diameter (in.) | ||||
| Power Tool Features | ||||
| Amperage (amps) | ||||
| 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.)
4.5
Details
Amperage (amps)
12
Arbor Size
5/8" x 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
7Questions11Answers
Does the back half of the GA4542C grinder body (the black part at the cord end) have a hard surfa...
Asked by Donny February 14, 20211
AnswerThank you for your question. The rear cover for the GA4542C grinder is part # 141578-5 this is was made out of hard plastic.
In what country is the Makita GA4542C grinder made? (For the United States market if it's made i...
Asked by Donny February 14, 20211
AnswerThank you for your question The country of origin of the GA4542C 4‑1/2" SJS™II High‑Power Angle Grinder is USA and also assembled in the USA. Please be advised that all of the Makita corporation's manufacturing centers around the world are held to the same Quality Criteria regardless of location.
In what country is the Makita GA5042C grinder made? (For the United States market if it's made i...
Asked by Donny February 14, 20211
AnswerThank you for your question The country of origin of the GA5042C 4‑1/2" SJS™II High‑Power Angle Grinder is USA and also assembled in the USA. Please be advised that all of the Makita corporation's manufacturing centers around the world are held to the same Quality Criteria regardless of location.
does this grinder use only Makita grinding disc or can you use off the shelf
Asked by rick February 18, 20203
AnswersYou can use your favorite brand as long as the arbor and disc diameter is what manual calls out.
is this grinder recamended for polishing granite
Asked by ltf May 17, 20172
AnswersIt is great for all different applications because of the speed control, from slow blade sharpening speeds to wide open power. Critical components are very well protected from dust, grit, and chips.
does this grinder come with a case
Asked by Makitaman March 5, 20172
AnswersNo, it does not.
What is the difference between the 4 1/2 SJS 9564CV and 4 1/2 SJS2 GA4542C? Other than the side handle and price.
Asked by Hollandsworth February 16, 20161
AnswerThe major differences between the Makita GA4542C and the Makita 9564CV is that the Makita GA4542C has a Max. RPM of 11,000 while the Makita 9564CV has a Max. RPM of 10,500. The Makita GA4542C also has the added benefits of the SJS™II Technology which Reduces Vibration for Operator Comfort.
Customer Reviews
Dec 16, 2015
Power to spare!
This is my first electric angle grinder, and I've only used it a few times so far but man, what a pleasure to use. Very smooth, even under heavy load. Spin-up is gradual so as to prevent the tool from torquing out of your hand, and I very much appreciate the safety disconnect that prevents it from powering on when plugging it in, if the tool was accidentally left or put in the on position when unplugged. I haven't gotten it to stall yet; it's more powerful than my air grinder, that's for sure. The variable speed is very helpful for more delicate operations which require a lighter touch.
by atfsgeoff
Nov 10, 2020
I had this tool for about a year before I lost my home to a fire. It was one of the first replace...
I had this tool for about a year before I lost my home to a fire. It was one of the first replacement tools I bought even before the house was finished. The 'soft start,' anti shock system in the drive gears and the variable speed all make this an easy tool to handle. With the right attachments it can go through just about anything you throw at it. I chose this model over the paddle switch version because it allows you to lock the trigger and hold it at angles which would make it difficult to hold the paddle. Be aware that it is the same as the 5" size grinder except for the size of the guard.
by FRCN
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