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⚡ Cut through metal like a pro—faster, cleaner, tougher.
The DEWALT DW8309 4-1/2" x 7/8" 80-Grit Zirconia Flap Disc is a high-performance grinding accessory designed for angle grinders. Featuring zirconia grit for 3x faster material removal and a premium abrasive cloth that lasts 15x longer than standard discs, it offers superior durability and efficiency. Its Type 29 fiberglass backing provides an optimal 20-25° grinding angle, making it ideal for smoothing welds, deburring, and reshaping metal surfaces with professional precision.




| ASIN | B000BQO76Q |
| Best Sellers Rank | #355,298 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #109 in Power Sander Fiber Backed Abrasive Discs |
| Brand | DEWALT |
| Brand Name | DEWALT |
| Compatible Devices | Angle Grinder |
| Compatible Disc Grinder Tool Models | DEWALT DCG416B |
| Compatible Material | Metal |
| Construction Type | Grinding |
| Customer Reviews | 4.8 out of 5 stars 839 Reviews |
| Global Trade Identification Number | 00028877310459 |
| Grit Material | Zirconia |
| Grit Material Type | Zirconia |
| Grit Number | 80 |
| Grit Type | Medium |
| Included Components | 4-1/2" x 7/8" 80 Grit Zirconia Flap Disc |
| Industry Standard Identifier | Type 29 |
| Item Diameter | 4.5 inches |
| Item Dimensions | 4.5 x 4.5 x 0.9 inches |
| Item Dimensions L x W | 4.5"L x 4.5"W |
| Item Thickness | 4.5 inches |
| Item Type Name | 4-1/2 X 7/8 80G T29 HP FLAP |
| Item Weight | 1.6 ounces |
| Manufacturer | DEWALT |
| Material Type | Blend |
| Model | DW8309 |
| Number of Items | 1 |
| Part Number | DW8309 |
| Product Dimensions | 4.5"L x 4.5"W |
| Recommended Uses For Product | Grinding |
| UPC | 028877310459 |
| Unit Count | 1 Count |
M**5
Tough grinner disc
Excellent quality and durability The price was a bargain for what you can get out of this grinner blade/disc
M**T
Turns Rusty Metal Into Showroom Shine
This flap disc is the real deal. DEWALT slapped some zirconia grit on a wheel and basically handed you a surface-smoothing weapon of mass reduction. Whether you’re cleaning up welds, smoothing edges, or shaving down that "oops" cut you swore was straight—this thing handles it like a champ. Durability? Let’s just say it outlasted my attention span and my playlist. It cuts smooth, runs cool, and doesn’t shred itself to pieces halfway through a job like those bargain-bin brands. Put it on your grinder and let it work its magic. You’ll be turning rough steel into buttered toast in no time.
B**)
This is such an amazing sanding disc!
If you have used these before, you already know how effective flap disc sanding is. It cuts through metal, or wood, or anything else in a surprisingly quick, yet controllable manner. If you need to remove a lot of material from a flat surface this is a good way to do it, of course you should also have other sanders to prep a finished edge. This is more to burn through a lot of wood or metal and it is very coarse, so you need to be cognizant of the amount of pressure you are using. Always taper the pressure off for awhile before you move to the next grit/sander otherwise you will have some deep gouges. If you haven't used one, and you have an angle grinder, this is a good way to expand your tool-kit cost effectively. You can do alot with an angle grinder and even more if you have the right discs.
D**.
Not sure
The product is great but why add special instructions for the delivery driver if they are not going to follow them. Leave on porch real simple. Not at mail box out at the road.
K**R
Fast
They grind down material real fast (and make a LOT of dust). They hold up pretty good as well. I just used one one two different flooring jobs with particleboard subflooring. One was a 9 to 10 inch wide, and 1/4 inch high ring around a toilet flange., it ground down in minutes. The second was a spot where a customer's dog would wet the floor under a desk. It was circular about twenty inches in diameter and 3/8 inches high in places. The same disk leveled it out in minutes as well. The disk looked like it had more life in it, but I pitched it anyway (it stank like dog urine).
C**O
Excellent
Good tool
K**I
Work awesome
These work great. They don't damage wood and really strip the varnish without gumming up
J**O
using with clone All-American 5005 lawn mower blade sharpening tool
I use the disk with a clone All-American 5005 lawn mower blade sharpening tool. It is working much better than a grinding blade. After sharpening a dozen or so blades, the disk is still in good condition. I am very impressed.
P**T
Good
Good wheels, have lasted well and perform well
L**Z
Solamente es un disco. La imagen con la que se publica es engañosa.
La foto que se usa para venderlo es muy engañosa. Me llegó algo completamente diferente (una sola pieza en una bolsa, no una cajita con 10 piezas). Respecto a calidad, es buen disco, y ya. Pero nunca a ese precio tan elevado. Cuidado con la publicidad engañosa.
E**Z
Buena marca, buen producto
Cumple perfecto
M**O
Five Stars
Prix avantageux sur Amazon et fonctionne très bien! Beaucoup plus durable que les marques générique tel que Mastercraft.
K**.
Five Stars
great
Trustpilot
2 weeks ago
1 month ago