Makita B-46159-25 4-1/2" x .032" x 7/8" Ultra Thin Cut-Off Wheel (25 Pack), Stainless

Works great on cast iron pipes.

I used this wheel to cut through a 25' damaged steel heavy corral gate and divide it into 6 sections to enable moving it for scrap. I used one wheel that was barely worn 1/8" less when I was done. The wheel cut through the steel like butter and the steel was 10ga. so it was not a light gate. It took me about 18 minutes from start to finish to go through the gate and make 6 uniform cut gate sections, so it was light enough to handle. These wheels are not cheap but since I was able to complete the entire task and barely used 1/8" off the wheel these are well worth it!

These are awesome on my makita grinder for cutting welds!

These cutting discs slice through mild steel quickly and efficiently. I used them on 1/4" thick tubes with complex angled cuts that caused other discs to break apart. These, however, held up exceptionally well.

Once you try these, you won't use another similar-sized cutoff. Made in Japan. Extraordinarily thin cut-off wheel for extremely fast cuts that is also flexible so you can deform it to cut flush. I buy the 5" models.I have had a few breaks after deforming them for too long during flush cutting, but I knew I was abusing them, and the breaks were always just the center hub separating from the disk, no drama, not damage, and no injury. I've used over a hundred of these and never had one break apart and throw pieces. They have never been dangerous and I don't run a guard. I'm using a speed-controlled Makita 12amp 9564CV 5" grinder or a Husky brushless 18v 4.5" grinder with them. I typically run the Makita at full tilt, so about 10.5k RPM.You will be blown away at how fast these cut and how well they hold up. With the cordless, they really get you a lot more cuts per battery charge.

I'm not too experienced with angle grinders or cutting pipe, but I've been experimenting with cutting discs and I'm quite satisfied with how these cut through the hardened stainless steel exhaust pipe pieces I cobbled together in order to fit an aftermarket muffler on my car. After my experience, I'd say the best way to get a nice even(-ish) cut is to groove a decent outline with a chain tube cutter and then allow this nice thin blade to cut along that groove - in a small fraction of the time it would take for even a higher end chain tube cutter to finish the job (for me, anyway.) In safe cutting areas (ie: NOT underneath a car in your driveway, lol) I found these discs to be the closest to using a Dremel, and of course they cut much faster. Spreading a little cutting oil on the area to be cut also seemed to help the blade last longer.

I expected better performance from a name-brand product, but these are no improvement over the generic ones you can get on Amazon. The cutting quality and longevity are about the same—and you can get a pack of 50 no-name versions for the same price. Dont pay more for a name!

I have been working with metal for 30 years. I have cut steel with a torch, band saw and chop saw. These wheels coupled with a Makita 15 amp angle grinder cuts through 1/2" plate faster than anything I have tried before. The cuts are also remarkably clean. I will definitely buy these again.