15W504 - Walter ALLSTEEL 5-Inch Flap Disc 40 Grit Type 27

Aggressive Cutting for Tough Welds

When you are under the hood and need to prep a joint or clean up a heavy weld, you want a flap disc that bites hard and lasts long. The Walter ALLSTEEL™ 5-inch Flap Disc (15W504) is built for exactly that. With a coarse 40 grit, this disc is your go-to for hogging off metal. Whether you are grinding down a heavy bead, beveling a plate for a root pass, or removing deep rust, the zirconia alumina grains dig in and remove steel fast, saving you time on every job.

One of the most frustrating things about cheap flap discs is how quickly they glaze over or stop cutting. The ALLSTEEL™ is designed to self-sharpen. As you grind, the grains micro-fracture to reveal new, sharp cutting points. This means you don't have to lean on the grinder with all your weight to get it to cut—let the disc do the work. This significantly reduces arm fatigue, especially when you are grinding out of position or overhead for extended periods.

The Type 27 flat shape is perfect for smoothing out long welds and getting a nice, flat finish without gouging the base metal. Plus, Walter included a trimmable backing on this disc. We've all thrown away flap discs that still had good abrasive in the center because the edge was worn out. With this disc, you can trim the plastic backing to expose that fresh abrasive, getting way more mileage out of a single disc. It’s a smart design that saves you trips to the tool locker and keeps you welding longer.