Forney 71919 4.5-Inch Flap Disc — 80 Grit

Name: Forney 71919 4.5-Inch Flap Disc — 80 Grit
Brand: Forney

Form

Discs

Grit

80 grit

Material

zirconia

The verdict

Where this pick fits.

Zirconia flap on an angle grinder backing. Medium aggression for weld cleanup and prep without the deep bite of 60.

Honest flap disc for rust and weld cleanup. No frills, plenty of grind.

Quick take

3.9/ 5 — where we land. How we score

Best for: weld cleanup, metal fabrication, angle grinder
Format: Discs
Tier: Mid tier
Grit lane: 40, 60, 80, 100, 120

The full read

The Forney 71919 is an honest zirconia flap disc, and 80 grit is its sweet spot — the medium setting between the deep bite of a 60 and an actual finish. Spun up on an angle grinder, the overlapping zirconia flaps grind and refine at the same time, wearing back to expose fresh abrasive as they go, which is why a flap disc keeps working smoothly where a rigid wheel would just gouge and load.

It's built for weld cleanup, rust removal, and general metal fab — knocking down a bead without digging trenches, blending prep without leaving deep swirl for the next step to fight. Mid-tier and no-frills: it doesn't last like a premium ceramic disc and doesn't pretend to, but there's plenty of grind in it for the money. Buy a few, use them up, keep the grinder fed. The 3.9 is fair — a workhorse for dirty metal, nothing romantic, all follow-through.

Use it when

The fit is obvious.

· Reach for the Forney 71919 4.5-Inch Flap Disc — 80 Grit when the job is weld cleanup, metal fabrication, and angle grinder — that is the fight it was built for.
· Zirconia runs hot and tough. It is the grain that grinds metal into an apology and asks for the next weld.
· This is a cutting grit, not a finishing one. It removes material and the surface’s attitude — it does not make anything pretty.

Skip it when

The job asks for something else.

· Leave it if the surface is already close to finish-ready. This grit will chew through good work just to prove a point.
· Leave it if you already know you want the premium option; a mid-tier pick is a compromise, and you clearly are not in the mood for one.
· Leave it if the work is edges, profiles, and tiny repairs — those are easier to control by hand.

Best for

Where it earns its keep.

· weld cleanup
· metal fabrication
· angle grinder

Keep moving

Useful next clicks.

Read the grit chartSee where this pick sits in the full climb.Browse projectsSee the exact grit climb for your job.

Buyer questions

The practical questions.

What is the Forney 71919 4.5-Inch Flap Disc — 80 Grit actually good at?

Honest flap disc for rust and weld cleanup. No frills, plenty of grind. Zirconia flap on an angle grinder backing. Medium aggression for weld cleanup and prep without the deep bite of 60. In short: it earns its keep on weld cleanup, metal fabrication, and angle grinder.

Is 80 the right grit lane for this?

It sits closest to 40 grit, 60 grit, 80 grit, 100 grit, and 120 grit. This is a cutting stage, not a finish stage. Use it to remove material, not to fake smoothness.