67339 - PFERD POLIFAN-CURVE 4-1/2" Flap Disc 40 Grit Zirconia Large Radius

Stop Gouging Your Fillet Welds

Grinding fillet welds has traditionally been a frustration for welders, often requiring specialized hard wheels or awkward angles that lead to gouging and rework. The PFERD 67339 POLIFAN-CURVE Flap Disc changes the game entirely. Designed specifically for standard 4-1/2" angle grinders, this disc features flaps that wrap around the edge, allowing you to grind directly into the corner of a fillet weld with the edge of the disc. This 40-grit Zirconia powerhouse eats through weld metal on both carbon steel and stainless steel, leaving a smooth finish that often eliminates the need for secondary blending steps.

The "Large Radius" design conforms naturally to the weld bead, giving you control and stability that flat discs simply cannot match. You get the aggressive stock removal of a hard wheel with the smooth finish and forgiveness of a flap disc. One of the standout features for daily use is the longevity; because you are using the radial edge, you utilize significantly more of the abrasive material than a standard Type 29 disc, which often gets discarded with plenty of abrasive left in the center.

Beyond just fillet welds, this disc is a versatile problem solver. The unique shape allows for "underhand" grinding—reaching into tight spots or grinding the underside of a lip without flipping the grinder or contorting your body. The fiberglass backing wears away cleanly, so you don't have to worry about plastic residue contaminating your stainless welds. Whether you are repairing defects, smoothing out a heavy bead, or prepping a joint, the POLIFAN-CURVE 40 Grit disc helps you get the job done faster and with better results.