Norton Abrasives Metal Rightcut and Angle Grinder FAQ: Variable Speed, 6-Amp Models, and the Saw Blade Question

If your browser history looks anything like mine did in 2019 — with Norton Metal Rightcut, Norton Abrasives grinding wheel, angle grinder variable speed, 6 amp angle grinder, and finally what kind of saw blade should I use to cut metal — this page is for you.

I have been handling abrasives and tool orders for a nine-person fab shop since 2017, after a few years of smaller jobs out of my own garage. I have personally made and documented 11 significant mistakes that cost about $2,300 in wasted wheels, damaged workpieces, and one weekend-ruining reorder. I keep a checklist now. These are the answers I wish someone had handed me before I ordered the first box.

Wait, what is the difference between a Norton Abrasives grinding wheel and the Norton Abrasives Metal Rightcut?

The short version: a Norton Abrasives grinding wheel is a grinding tool, and Norton Abrasives Metal Rightcut is a cutting tool. That sounds obvious once you read it, but online listings do not always make it obvious.

A standard Norton Abrasives grinding wheel — usually the thick Type 27 with the raised center — is made for grinding. You push its face along metal to smooth a weld, knock off rust, or shape an edge. The Norton Metal Rightcut is a thin cutoff wheel. It is designed to slice into material using its edge, not rub against it with its face. The thin profile is the whole point: it creates a narrow kerf, so it cuts faster and leaves less heat and burr than trying to force a thick wheel through the same cut.

I learned this in 2018 by using a grinding wheel edge to cut stock because we were out of cutoff wheels. It worked, technically. It also took forever and left a cut that looked like a squirrel had chewed it. Forcing any wheel to do a job it was not built for is how wheels get damaged, and that is the part I really regret.

Keep both in the cabinet. If you are cutting stock, reach for the Rightcut. If you are shaping or cleaning up after the cut, use the grinding wheel.

Can I use a Norton Metal Rightcut wheel on an angle grinder with variable speed? What speed is right?

Yes. A variable speed angle grinder is actually a good pairing with a Rightcut wheel. The number I check first is not the dial on the grinder. It is the max RPM printed on the wheel. Most 4-1/2 in. wheels of this type are marked with a maximum somewhere around 13,300 rpm, while 4-1/2 in. angle grinders usually spin between 10,000 and 11,000 rpm, so even at full speed you are still inside the rating. But the label on your specific wheel is the final word. According to OSHA 29 CFR 1910.215, a wheel should never be run above its marked maximum speed, and I treat that as non-negotiable (osha.gov).

For mild steel angle, tube, and sheet, I run the grinder at full speed and let the wheel do the work. When I switch to thin stainless, I back the variable speed down to about 70 to 80 percent of maximum. That keeps the steel from turning blue at the cut edge. What I do not do is drop the speed so low that the wheel starts flexing and I start leaning on the grinder. A forced, glazing wheel is the fastest way to ruin a disc and your temper.

Is a 6 amp angle grinder enough to drive Norton Metal Rightcut wheels, or will it stall?

For cutting metal, most of the time, yes. I keep a 6 amp variable speed grinder on the bench for smaller work, and it goes through 1/8 in. angle iron, all-thread, and 16-gauge tube with a fresh Rightcut wheel as long as I do not lean on it. A cutoff wheel removes very little material compared to grinding, so it does not need a giant motor behind it.

Grinding is where the amps matter. Pressing a 1/4 in. grinding wheel into a weld needs power. Slicing with a thin cutoff wheel needs a clean disc and patience. The limitation shows up on long, continuous cuts in thicker steel. A 6 amp motor slows down, and when the wheel slows, your instinct is to push harder. That is the moment the cut goes bad or the motor starts to smell like regret.

For a small shop, a home garage, or somebody doing a dozen cuts before lunch, 6 amps is enough. I would not talk anyone out of a bigger grinder if they do this every day, but do not wait to buy a 10-amp machine before you start using quality Norton abrasives. The wheel makes a bigger difference than the number on the motor.

What kind of saw blade should I use to cut metal?

This is the right question, but there is a trap hiding inside it. I say that because we once had a guy nearly mount a circular saw blade onto an angle grinder after searching this exact phrase. The correct answer depends on which tool you are using.

If you are using an angle grinder, the answer is not a blade. It is a bonded abrasive cutoff wheel like the Norton Metal Rightcut. A toothed circular saw blade should not go on an angle grinder. Those teeth can bite into the metal and kick the tool in a way the grinder was never designed to handle.

If you are using a circular saw, then yes, you need a saw blade — one specifically made for cutting ferrous metal, with carbide teeth and the correct hook angle. Do not use a wood blade on steel.

If you are using a reciprocating saw, use a bi-metal blade.

So when someone asks what kind of saw blade should I use to cut metal, my first question back is: what saw? If you were holding an angle grinder when you asked, the thing you are describing is the cutoff wheel.

Is the Norton Metal Rightcut worth the higher price if I only cut metal occasionally?

I went back and forth on this one for a long time. To be fair, a cheap cutoff wheel will cut steel. It just does it slowly, leaves a bigger burr, and sometimes glazes on stainless before you are halfway through the cut.

A couple of years ago, I ran a small side job in my garage: cutting 60 pieces of thin-wall steel square tube. I picked up a pack of budget wheels and a pack of Norton Rightcut so I could compare them side by side. I do not have hard data — I was not running a stopwatch on every cut, and the wheels were not from the same production lot — but anecdotally the difference was obvious. The Rightcut finished pieces faster, the edges needed less cleanup, and the wheels did not crumble at the rim when I hit a corner.

Here is my take. If you only cut metal a few times a month, you do not need an industrial workshop. But you also do not need the aggravation of a wheel that fights you the whole way through one cut. The Rightcut costs more, but it buys a smoother cut and fewer return trips to the store. In my opinion, that math works even when the order is small.

Before you order: what is the one mistake people make when buying Norton Abrasives for an angle grinder?

I will give you the checklist I keep in my phone notes, because each of these has cost me real money.

Diameter has to match the grinder. A 4-1/2 in. grinder takes 4-1/2 in. (115 mm) wheels. In March 2024, I ordered a stack of 5 in. wheels for a compact grinder, assuming the guard would just sit tighter. It does not work that way. The guard size wins, and I ate a restocking fee.

Max RPM has to be checked on the wheel, not assumed from the grinder. Even with a variable speed angle grinder, the printed max speed on the wheel is the ceiling. ANSI B7.1 and OSHA 29 CFR 1910.215 both point the same direction: never exceed the wheel rating (osha.gov). Keep the guard on too.

Type has to match the job. If the job is cutting metal, buy a cutoff wheel. If the job is grinding, buy a grinding wheel. Trying to save money by buying one type and using it for both usually costs more in the end. Mental note for me: add this to the new hire checklist before anybody places another order.