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Makita’s ¼” SJS Die Grinder (model GD0800C) combines a powerful 6. 6 AMP motor with motor and gear protection features for longer-lasting grinding performance. The GD0800C features a slide switch for increased convenience. The GD0800C is equipped with SJS , an innovative mechanical system that allows the drive shaft to slip if the wheel suddenly catches or binds. SJS is engineered to help protect the gears and motor, and extend grinder life. The GD0800C is powered by a 6. 6 AMP motor that delivers 7, 000 – 28, 000 RPM with soft start for smooth start-ups. The electronic speed control maintains constant speed under load, and a variable speed control dial allows the user to match the speed to the application. Consistent with other models in Makita’s expanding grinder line-up, the GD0800C features labyrinth construction, a series of channels engineered to capture dust and debris and prevent contaminants from penetrating the gear box and front armature bearing for longer tool life. In addition, the protective zig-zag varnish seals the motor and bearings from dust and debris by creating a barrier under rotation.
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Makita's 1/4-Inch SJS Die Grinder combines 6.6 AMP power with comfort and motor-protection features for longer-lasting grinding performance. The GD0800C is engineered with Makita's innovative Super Joint System (SJS) to protect the gears for longer tool life.
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GD0800C FeaturesPOWER - High-speed motor (7,000 - 28,000 RPM) for maximum productionPERFORMANCE - Super Joint System (SJS) helps prevent gear damageCOMFORT - Slim double-neck designDESIGN - Electronic speed control maintains constant speed even under loadINCLUDES - 1/4" collet cone, wrenches and side handle
Tool SpecificationsCollet1/4"No load speed7,000-28,000 RPMSpindle thread5/8"-11 UNCAMPS6.6Overall length14-5/8"Net weight3.5 lbs.6.6 AMP Power with SJS to Protect Gears
The GD0800C is powered by a 6.6 AMP motor that delivers 7,000 to 28,000 RPM with soft start for smooth start-ups. The electronic speed control maintains constant speed under load, and a variable speed control dial allows the user to match the RPM to the application. Labyrinth construction protects the motor with a complex set of channels, prohibiting dust and contamination. In addition, the protective zig-zag varnish seals the motor and bearings from dust and debris by creating a barrier under rotation. The GD0800C is engineered with SJS, an innovation from Makita that protects the gears by automatically disengaging the motor should the grinding wheel accidentally catch or bind.
Comfort and Ergonomics
The GD0800C weighs just 3.5 pounds and is built with comfort and ergonomic features for extended use. The slender double-neck aluminum gear housing is designed for easy handling, and the slide switch is positioned on the small circumference barrel grip for easy operation. A side handle can be easily installed on the side of the tool.
Versatile Design for a Range of Applications
The GD0800C is a versatile and powerful die grinder engineered for a range of applications including pipe fittings and small scale grinding. The GD0800C is built for welders, plumbers, ship builders, automotive technicians, HVAC, and general contractors seeking a best-in-class industrial quality die grinder. The GD0800C is just another example of Makita's commitment to innovative technology and best-in-class engineering.
About Makita's Super Joint System (SJS)
Super Joint System (SJS) is an innovation from Makita engineering where the motor armature and spiral bevel gear are linked by a coil spring. If the grinding wheel catches or binds, the coil spring relaxes and disengages the gears from the motor. As the grinding wheel stops, the gears and motor are protected. Makita's growing line of SJS-equipped grinders includes models ranging from a 1/4-inch die grinder to a 7-inch angle grinder.
About Makita
Makita is a worldwide manufacturer of industrial quality power tools and offers a wide range of industrial accessories. Makita applies leading-edge innovation to engineer power tools that are more compact and energy efficient, yet deliver industrial strength power and results. Makita U.S.A., Inc. is located in La Mirada, California, and operates an extensive distribution network located throughout the U.S. For more information, please call 800/4-MAKITA (800/462-5482) or visit makitatools.com. Makita is Best in Class Engineering.
Warranty
Every Makita tool is thoroughly inspected and tested before leaving the factory. If you are not satisfied with any Makita tool within 30 days of purchase, return it and Makita will provide a replacement or refund. Each Makita tool is warranted to be free of defects from workmanship and materials for the period of ONE YEAR from the date of original purchase. Should any trouble develop during this one-year period, return the COMPLETE tool, freight prepaid, to one of Makita's Factory or Authorized Service Centers. Please see makitatools.com for complete details.
What's in the Box
Makita GD0800C 6.6 AMP 1/4-Inch SJS Die Grinder, 1/4-inch collet, wrenches, and side handle.
Vince W
Reviewed in Canada on March 15, 2025
Awesome power. Variable speed is nice. Comfortable to hold
The Professor
Reviewed in the United States on May 28, 2024
This is a very good grinder. It is powerful and the bearings are smooth enough to make it precise. In fact, I made a fixture to attach it to my metal lathe. Using this tool, I was able to restore some damaged parts to precision tolerances. Excellent!
カスタマー
Reviewed in Japan on July 14, 2022
今まで使用していたものより、パワーが有って使いやすかったです。
Hassü
Reviewed in Germany on June 10, 2022
Kam gerade zur richtigen Zeit und hat mir wunderbare Abhilfe geleistet beim Zaunbau. Hatte das Problem das mein kindersicherer Knauf gegen die Leiste kommt und die Tür dadurch nicht aufging. Ein Stück habe ich mit dem Geradschleifer weggeschliffen. Bei meiem Tor habe ich eine Torfestellung die man von unten nicht einfach hochdrücken kann, sondern um es zu öffnen ein Flügel offen haben muss um ihn zu drehen. Nur leider hatte ich immer diesen Spalt zwischen beiden Flügeln und ich konnte keine Leiste wegen der Torfeststellung anbringen bis ich meinen Geradschleifer bekam, habe ich wunderbar ausgeflext damit, sodass ich Sichtschutz und Torfeststellung dran haben kann.Dieses Teil hat auf jeden Fall ordentlich Power. Man kann schnell hoch und runter arbeiten damit, besser läuft es wenn man an einer Stelle schleift, aber sobald sich eine Kuhle reinfräst, wird es schwer sie wieder rauszufräsen. Mit Gewalt und Druck läuft es auf jeden Fall nicht. Bin absolut zufrieden damit, war eine gute Investition und hat mir wunderbar weitergeholfen. Kan. ich mit gutem Gewissen weiterempfehlen und würde ich mir jederzeit wieder kaufen. Preis-Leistungsverhältnis ist auch super.
William H. Herzfeld
Reviewed in the United States on April 2, 2022
This tool replaced an older, less powerful Makita tool. The difference is striking, the motor, being bigger, just doesn’t bog down, so it cuts through materials quickly. It is also variable speed, so for using it on soft or delicate material, the ability to use a slow speed is great. It is a formidable tool, and a bit heavy but the brace / handle really helps support it and makes it steady and safer. The only negative thing is the locking chuck, as others have mentioned, takes some getting used to. If you tighten it too much, it can be difficult to get the bit loose. Just be aware, not to torque it down too much. All in all, a relatively expensive die grinder that is worth the money.
Jb
Reviewed in the United States on September 29, 2020
I was excited to get this die grinder, as my dewalt had died after very heavy use and abuse, hours of nonstop grinding in hot summers. I've since went to air but missed having something easily portable with electric so I looked around. It seemed most people prefered makita over bosh so I bit.I wasn't a fan of the switch, never am, but i figured i could lock it in place and how dangerous can a die grinder be, especially when in a 1/2" steel race.On my first use I used it for 30 seconds with a carbide bur {i've been using the burrs for 2 years now at 30,000RPM in air grinders} to ream out rough edges of an exhaust pipe. very light duty. did great, very very smooth. but that's by no way a test compared to what my dewalt did.Second use was a few days later, i used to ream out a bolt hole. regular a36 steel, 1/2" hole making into a slot. When I turned out tool has a rough feel and a slight grind but smoothed out. Okay? i thought. reamed out my hole and thought all was fine. Used same burr.Third use. Put same burr in. Found the speed adjustment, cool i thought i didn't remember reading this was adjustable. I've used at speed 5 the last two times, I thought, lets start slow and took it down to 2 or 3,I can't remember which. I flip the switch on, the tool soft start was non-existent, the tool vibrated like a regular die grinder would've vibrated {considering it was smooth the first and most of second use} but was loud, the tool seemed to spin FAST, faster than it did at max speed. In 2 seconds the tool had somehow taken a burr that i've used many times on air die grinders at 30,000rpm and vibrated/span the bit and bent the shaft at a complete 90 degree angle, hit my other hand's finger without me noticing {only taking skin} and was a death trap. The switch was stuck on so I had to try to reachfor the cord as my peer beside me called me a dumba** for putting some weird 90 degree deathtrap tooling into a die grinder that was hurting me and uncontrollable not knowing how a die grinder could deform a steel shaft into a complete 90 degree.Some may speculate, oh the tooling was bad. was already bent, or whatever. No, it was straight, I probably have 35 hours of light grinding on this bit if I had to guess. during those 35ish hours of use I've never pressed hard on the bit to deform the shaft as the carbide was still sharp.Some people may say, you did something to break the grinder. It had a minute of use. It was brand new never opened when I got it. After the first two uses I put it in the original box how it was shipped and stored it in my truck on the floor under the seat where nothing was on it and it wasn't sliding around.I can see how an unbalanced tool can bend a steel shaft with vibration and rotation, but I was still completely surprised it happened. and how in the blink of an eye the bit went from no run out to a wild nun chuck.I have some other light duty makita lithium tools. I have a lot of brands actually, all are light duty but get high use. Makita was probably my second favorite. I don't have anything heavy duty because I have a heavier tooling and am not mobile. I will not buy another makita product. There is nothing the company can do or say to make this right. When the battery powered makita tools die I won't fix them and definitely will not replace them with Makita.
Stefano
Reviewed in Italy on July 16, 2016
La Smerigliatrice Makita GD0800C diritta, 8 mm, non corrisponde al mio ordine in quanto in entrambe le spedizioni mi è stata consegnata con la Pinza max: Ø 6 mm.Allego una foto in cui è evidente che all'attacco è da 6 mm, poiché la fresa inserita è ad 6 mm e non è possibile inserirne di dimensioni superiori.
Cliente
Reviewed in Spain on December 18, 2015
Excelente producto. Gran versatilidad a la hora de trabajar madera. 100% efectiva.Para poner una pega, quizás tendría que venir con el accesorio de empunyadura.
R. Chapel
Reviewed in the United States on February 19, 2013
It looks like the designers at Makita got it right. This is a very smooth and quiet die grinder. There is no perceptible vibration at any speed and the motor sound is minimal. But don't expect silence when you put grinding wheels or burrs into the unit and begin removing metal. The cutting action will make far more noise than the motor or bearings. The noise then gets irritating so wear ear plugs and/or ear muffs.My use has been grinding cast iron and steel castings to prepare them for painting. I have also used it to grind mower blades, a job which is now much easier and safer than using my 4 1/2" wheel grinder.The weight is just right. I was afraid it would get heavy after a while but it didn't. It has enough mass to make controlling it feel good without making it too heavy for extended use.Unlike many tools, the Makita does not get hot to the touch. Neither the motor end nor the gears and bearings gets more than warm which means the motor and bearings are designed right and of high quality.The most important feature of the 800C is probably the variable speed which is 7000 to 28000 RPM. The importance of this is due to the fact that all grinding wheels, burrs, wire brushes or felt bobs have different maximum speeds at which they are rated to be safe. It is not wise to exceed the rated speed of the cutting tool. Variable speed also allows the user to adjust the speed to make the most efficient cut or the smoothest finish. Without this feature you would not be able to safely use many grinding wheels or wire brushes and control would be much more difficult.In many hours of use I have not needed to use the highest speeds, staying below 19000 down to 13000.Electronic speed control works imperceptibly to keep the speed where you set it even when you put pressure on the tool to remove material faster. I have never noticed the speed or motor sound vary at all. I imagine a person could bear down hard enough to overpower this feature and bog down the motor, but that's where the 6.6 amps comes in. That means it has enough power to maintain it's speed even under heavy pressure.The side handle is strong and stays in place, though it can be loosened and rotated to suit left handers. It provides excellent control of the cutting action. This is not a one handed tool, like the little hobby grinders so commonly seen. You don't hold it like a pencil. It takes two hands at all times, and the ergonomics are good.The only gripe I have been able to come up with is that the collet nut is hard to loosen when removing bits. It begins to loosen normally then stops and requires extra force to start unthreading again. I don't know if this is a one-off with this unit, or if it is a manufacturing issue. The collet is captive inside the nut, so maybe this is how it is meant to work. At any rate it is a minor concern.The two collet wrenches are sturdy.All in all this is a sophisticated tool that shows a lot of thought by its designers.
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