The 4.5″ has a cut off wheel in it most of the time, and the 7″ has a bigger cut off wheel. A couple more comments- check the grinder speeds and the rated speeds of the wheels – especially wire wheels. The last 5″ wire wheel I bought can only be run in the 7″ grinder, as its rated speed is lower than my smaller grinders run at.
Below is a specification comparison between a Metabo 4 1/2″ Angle Grinder and Metabo 5″ Angle Grinder. “In a comparison test, we used a Metabo 4 1/2″ Angle Grinder against a Metabo 5″ Angle Grinder with the same bond Speedgrit 1.6mm cutting discs. Measurement Metric 4 1/2″ Angle Grinder 5” Angle Grinder In house cutting test results cutting 150mm x 8mm mild steel flat and 1.6mm discs 3 cuts 6 cuts 100% greater consumable life Average time per cut 67secs 55 secs 21.8% faster cutting speed.
So a 4.5-inch disc is best for such a grinder while a 7-inch angle grinder works best with a 7-inch disc and so on. The best angle grinder size for thick materials such as concrete and stone are those with 7-inch discs and above. Once you understand these factors listed, you are on your way to choosing the best angle grinder for your needs that match the grinder size required.
You also almost always need two hands on the grinder, everything you grind will;l have to be clamped down. I don’t weld really heavy material though, someone grinding on 2 inch plate all day will NEED the bigger grinder practically speaking. I love the dewalt rat tail 4.5″ – 6″ inch grinders myself.
5 / 5 inch Angle Grinder The cheapest angle grinder to buy. Entry level 5 inch models are similarly priced to top end 4 inch grinders. Supportable inner disc diameter is 16mm.Supportable inner disc diameter is 22.23mm. Most of the Marble cutter blades, Concrete Cutter blades, Tile Cutting Diamond Discs, Wood cutting blades having 20mm Arbor diameter can be easily used with 4 inch angle grinders.
12-25-2006, 05:38 PM.I’d really recommend you get a variable speed grinder, Carolyn, and I’ve not seen those in anything smaller than the 4 1/2″. Are a couple threads, one recent, specifically about angle grinders. Angle Grinder in the title even. Might give you some insight into brands.”The good variable speeds are gonna be heavier than the 4″ Makita you used, but it’s well worth the weight to get that slow speed when you want it. 12-25-2006, 05:46 PM. I have the same Makita variable speed grinder CX has except it’s a 5 inch. 12-26-2006, 11:53 PM.When my DH learned I was considering a grinder over 4 lbs he gave me a *stern glare* 🙂 …he lived through my agony with my right arm this summer and doesn’t want me overstraining myself again.
angle grinder 4 vs 4.5 Related Question:
Which is better 4 inch or 5 inch angle grinder?
The number of cuts achieved with the 5” Angle Grinder were 100% greater than the 4 1/2” Angle Grinder. The 41% output power and 36% torque provided by the 5” Angle grinder, meant that the disc speed remained at its optimum, allowing the disc to work more efficiently.
Does angle grinder size matter?
The size of the disc should have a direct bearing on your choice of angle grinder. The two most common disc sizes are 4.5” (115mm) and 9” (230mm). Grinders with larger discs are particularly well suited to heavy-duty applications, whereas those with smaller discs are ideal for finer work.
Is a bigger angle grinder better?
A larger tool means you’ll be able to quickly cover a larger surface area, so if you’re going to be mainly cutting out mortar, or working with sheet materials and slabs. A smaller 115mm angle grinder means a more versatile power tool.
What is the best size of angle grinder for home use?
Angle grinder size comes in a variety of sizes. But don’t get confused because there are only 3 sizes, namely the 4.5-inch, 7-inch and the 9-inch you could best choose from. The 4.5-inch is mainly for home and domestic use.
How deep can you cut with a 4.5 inch angle grinder?
A 4.5 angle grinder has a blade that is 4.5-inches in diameter. This means the blade extends 2.25-inches for the center in each direction. As a result, it is not physically able to cut through 4 inch concrete. Select a larger grinder when a deep cuts are necessary, such as a 9-inch grinder.
How deep does a 115mm angle grinder cut?
While 115mm angle grinders offer a maximum cutting depth of only 30 mm, they are precise, easy to handle and lighter than larger versions.
Whats a good size for a grinder?
Common discs sizes include 4-1/2 inch, 5 inch, 6 inch, 7 inch, and 9 inch. A small angle grinder (disc size under 7 inches), is ideal for many common applications. For larger surfaces and bigger depth of cuts, a larger disc size is more effective.
Can I use bigger disc on angle grinder?
Fitting a 14 inch (356 mm) cut-off disc to a 9 inch (230 mm) angle grinder will increase the edge speed excessively to at least 120 m/s (430 kmph). The photograph below shows an angle grinder with the wrong size cutting disc fitted and the guard removed.
How do I choose an angle grinder disc?
depends on the type, shape and thickness of the steel that needs to be cut. For standard everyday jobs on either stainless or mild steel using an angle grinder, choose a 1mm or 1.6mm thickness in your disc. For projects that involve thin metal such as sheet metal, choose a 1.0mm or 0.8mm thinner cutting disc.
What is an angle grinder best used for?
An angle grinder can be used to replace a larger tile saw to cut ceramic tiles, concrete paving stones, and many other types of stone. For this type of work, you would need either a cutting disc that specifies use with masonry or (more commonly) a diamond blade.
What is the standard size angle grinder?
When you begin to look at angle grinders, you will need to decide on what size disc you will require, with the two most common sizes being 4.5” (115mm) and 9” (230mm). The size of the disc determines the depth of the cut possible, so larger jobs will require larger discs.
How many angle grinders do you need?
The best option is to consider which attachments you use the most. Let’s say you tend to use a hard wheel and a wire wheel most often. Then having 2 grinders will allow you to switch between the two effortlessly. Obviously, most welders start out with 1 grinder.
What is the best wattage for angle grinder?
for grinding: 1,000 watts. for cutting through simple materials: 1,500 watts. for cutting through strong metals: 2,500 watts.
Can an angle grinder cut through concrete?
Concrete cutting is a common task at the construction area, such as cutting concrete floor, concrete wall, concrete slabs and concrete pavers. Although the various concrete cutting saw is available, an angle grinder is the most convenient tool for small concrete cutting work.
What is a 7 inch angle grinder used for?
Makita Angle Grinder 7 Inch This angle grinder from Makita is a powerful tool that will help you get the job done. It is perfect for grinding and cutting like metal, masonry, and concrete. With a 15 AMP motor, this grinder delivers 6,600 RPM and can handle the most demanding applications.