Flap Wheel 3" x 1" Mounted Aluminum Oxide, Pack of 10
Flap Wheel 3" x 1" Mounted Aluminum Oxide, Pack of 10
Available in stock (50000)
When the work is big and the tool is a drill, a 3" x 1" flap wheel is the most productive thing you can put on a 1/4" shank. The long flaps cover a wide band of tube, tank wall or plate per pass, run cool, and last far longer than a small wheel doing the same job, and the 3" diameter gives enough tip speed at drill RPM to blend welds and satin stainless properly. It is the step between the small mounted wheels and our unmounted 6" to 12" bench wheels.
Aluminum oxide cloth flaps on a 1/4" steel shank, pack of 10, one grit per pack from 40 to 320, in plain shank or 1/4-20 thread shank. Tank and vessel fabricators, stainless railing shops, truck and trailer builders, and woodturners finishing large bowls and platters are the regular buyers.
- Largest mounted size: 3" diameter by 1" face covers tube, tank walls and panels fast
- Long flaps run cool and outlast smaller wheels on the same job
- Cuts properly at drill and slow die grinder speeds
- Aluminum oxide cloth flaps expose fresh grain as they wear for a consistent finish
- Plain 1/4" shank or 1/4-20 threaded shank for extension arbors
- 40 to 320 grit, pack of 10, converted in Anaheim, California
Which shank and which grit for large surfaces?
- Plain Shank: straight 1/4" steel shank for drill chucks, 1/4" collet die grinders and flex shafts. Most buyers want this.
- 1/4-20 Thread Shank: a 1/4-20 threaded stud that screws into a mandrel or extension arbor. On a 3" wheel this is the choice for tank and vessel work, where the wheel is run on a long extension into the shell and swapped at the far end.
Grit for surface work on tube, tank and plate:
- 40 and 60 grit: mill scale, rust, old paint and spatter over large areas; heavy weld blending. The long flaps carry coarse grit without heating the steel.
- 80 and 100 grit: blending weld toes and grinder marks on tube and plate, first pass on aluminum.
- 120 and 180 grit: brushed finish on mild steel, pre-paint refinement, the standard architectural satin on stainless rail and panel.
- 240 and 320 grit: fine satin on stainless and aluminum, interior finish on food and process tanks before polishing, finish sanding on large turned wood.
Grit guide for tube, tank and panel finishing
| Grit | Use it for | Notes |
|---|---|---|
| 40–60 | Scale, rust, paint, spatter, heavy blending | Refine with 80–120 before coating |
| 80–100 | Weld toes on tube and plate, aluminum first pass | Working grits for fabrication |
| 120–180 | Brushed steel, stainless rail and panel satin | One direction on the final pass |
| 240–320 | Fine satin, tank interiors, pre-polish, wood | Light pressure; follow with compound if bright |
What tools does a 3" x 1" mounted flap wheel fit?
- Electric and cordless drills. The main tool for this size. A 3" wheel cuts well at drill speed, and a drill cannot overspeed it. Use a drill with a side handle for long sessions; the wheel has real leverage.
- Variable-speed electric die grinders with a 1/4" collet, set down to the RPM marked on the wheel.
- Air die grinders only if their speed is at or below the wheel's rating; most small air die grinders are too fast for a 3" wheel.
- Flex shaft handpieces with a 1/4" chuck or collet.
- Extension arbors with a 1/4-20 tapped end, using the threaded shank version, for tank shells, long tubing and deep housings.
Chuck the shank as deep as it will go and keep stick-out short; a 3" wheel on a long unsupported shank whips. Always run within the RPM marked on the wheel or the tool's rating, whichever is lower. This is the lowest-rated diameter in the mounted range.
How to get the most out of it
- Check the speed rating before the tool goes on. A 3" wheel is rated well below a small one. If the tool cannot be run at or below the RPM on the wheel, choose a drill or a smaller wheel.
- Let the long flaps brush the surface. Light pressure; you should see the tips flex, not fold. Leaning on a 3" wheel overloads the drill, heats the work and tears flaps at the hub.
- Keep the flaps trailing. Move the tool so the flap tips drag across the work. If it climbs a tube or kicks off a panel, reverse the direction of travel.
- Overlap by half. On tank walls and panels, run straight passes that overlap the previous one by about half the face width, always in the same direction on the final grit.
- Wrap tube and blend welds lengthwise. Travel along the tube or weld with the face wrapped over the curve; crossing leaves visible marks.
- Run dry and clear with air. Scale, paint and aluminum load the flaps. Blow the wheel out and reduce pressure rather than pressing harder.
- One grit band at a time, fresh wheel for the last pass. The final satin is only as even as the wheel that makes it.
Use it for / don't use it for
Use it for
- Finishing the inside of tanks, vessels, drums, hoppers and large tubing from about 3" ID up
- Satin finishing stainless and aluminum rail, tube, posts and panels
- Blending weld toes and grinder marks on truck bodies, trailers, frames and heavy weldments
- Removing mill scale, rust and old paint from plate, angle, channel and pipe
- Deburring the edges of thick plate and large machined parts
- Finish sanding large turned bowls, platters, columns and curved furniture parts
Don't use it for
- Small air die grinders that exceed the RPM marked on the wheel
- Grinding welds flush or heavy stock removal; use a flap disc or a coarse belt
- Cutting or notching
- Grooves, keyways and inside corners; use a 1/2" wide wheel
- Bores and tubing under about 3", where the wheel will not fit or the flaps cannot flex
- Bench grinders and polishing lathes; use our unmounted 6" to 12" flap wheels with arbor holes there
Specifications
| Size | 3" diameter x 1" face width |
|---|---|
| Abrasive grain | Aluminum oxide on cloth flaps |
| Construction | Radially arranged cloth flaps on a hub, mounted on a steel shank |
| Shank options | Plain 1/4" shank or 1/4-20 threaded shank |
| Grits offered | 40, 60, 80, 100, 120, 180, 240, 320 |
| Pack quantity | 10 wheels of one grit and shank style |
| Wet or dry | Dry |
| Speed | Within the RPM marked on the wheel or the tool's rating; lowest of the mounted range |
| Also available | 3" x 1/2" narrow face; 1" to 2-1/2" mounted; 6" to 12" unmounted with arbor holes |
| Converted in | Anaheim, California |
Frequently asked questions
Should I choose the 3" x 1" or the 2" x 1-1/2" for finishing flat panels?
Both suit panels. The 2" x 1-1/2" has the wider face and covers a flat sheet slightly faster on a right-angle die grinder. The 3" x 1" has longer flaps, so it runs cooler, lasts longer and works better at drill speed, and it also handles tube and tank interiors. For a drill-based shop, the 3" x 1" is the more versatile choice.
Can a cordless drill handle a 3" flap wheel?
Yes. A 3" x 1" wheel is a natural match for a drill: the diameter gives enough tip speed to cut properly and the drill cannot exceed the wheel's speed rating. Use light pressure so the drill is not bogged down, fit a side handle if the drill has one, and let the flaps do the work rather than forcing them.
How do I finish the inside of a stainless tank with it?
Mount the threaded shank version on a 1/4-20 extension arbor, or the plain shank in a drill for shallow vessels, and work in straight overlapping passes at 120 or 180 grit, then 240 or 320 for a fine satin. Keep the whole face on the wall, the flaps trailing, and pressure light so the stainless does not heat-tint; finish with compound on a buff if a bright interior is specified.
Why is a 3" wheel rated for a lower speed than a 1" wheel?
Because the flap tips on a 3" wheel travel three times as far per revolution as those on a 1" wheel. At the same RPM the outer edge is moving far faster, and beyond the rating the flaps tear and the wheel can come apart. Always run at or below the RPM marked on the wheel, which on a 3" wheel usually rules out small air die grinders.
When should I move up to an unmounted flap wheel instead?
When the work comes to the machine rather than the machine to the work. A 3" x 1" mounted wheel is for hand-held finishing in place. For high volumes of small parts, or for finishing tube and bar against a stationary wheel, our 6" to 12" unmounted flap wheels with arbor holes on a bench grinder or polishing lathe are faster and last longer.
What grit for weld blending on a trailer or truck frame?
Use 60 grit to knock down spatter and blend the weld toe into the parent metal, then 80 or 120 to remove the coarse scratch before primer. Work along the weld rather than across it, keep the wheel moving and pressure light. If the frame will only be primed and painted, 120 grit is a good stopping point.
How is the 10-pack sold and are bulk prices available?
Each pack contains 10 wheels of one grit and one shank style. Orders over $200 ship free, unused wheels in original packaging can be returned within 30 days, and case pricing for fabrication and tank shops is available by calling 714-646-3299 or emailing sales@maverickabrasives.com.
Related products and guides
- All flap wheels, mounted and unmounted
- 3" x 1/2" Mounted Aluminum Oxide Flap Wheels, pack of 10 (narrow face)
- 2" x 1-1/2" Mounted Aluminum Oxide Flap Wheels, pack of 10 (wide face)
- 6" x 1" Unmounted Flap Wheels for bench grinders and polishing lathes
- Custom sanding belts made to order in about 3 days
Couldn't load pickup availability
Get $20 off when you spend $1,000 or more! Learn more
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
