Mounted flap wheels

Mounted Flap Wheel, 1-1/2" x 1/2, 40 Grit, 1/4" Shank, Aluminum oxide


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Dia. external
Dia. shank
Grit size
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Technical information
Mounted Flap Wheel, 1-1/2" x 1/2, 40 Grit, 1/4" Shank, Aluminum oxide

Item number Global part number
Aluminium oxide A
Dia. external
1 1/2 Inch
Dia. shank
1/4 Inch
EDP number
Grit size
Length, shank
1 1/2 Inch
RPM, max.
23000 RPM
RPM, optimum
9600 RPM
1/2 Inch
Packaging unit
10 pieces

With mounted flap wheels, coated abrasive flaps are arranged radially around the core in a fan-like structure. The flexible flaps perfectly adapt to surface contours. The abrasive grain is embedded in the sturdy, flexible cloth backing material with a resinoid bond.

In ISO 3919, mounted flap wheels are designated as "flap wheels with shaft."

For universal applications from coarse to fine grinding.

  • Conforms to contours due to high flexibility.
  • Consistently high stock removal rate throughout the entire service life as new, aggressive abrasive is constantly exposed.
  • Can be used face-down very close to edges and in corners thanks to the flat, moulded-core design.
Recommendations for use
  • Flap wheel wear and the thermal load on the workpiece are reduced by decreasing the contact pressure and peripheral speed, and by adding grinding oil.
  • Stock removal rate should be increased by using a coarser grit, not by increasing the contact pressure. This avoids unnecessary flap wheel wear and prevents the thermal load of the workpiece.
  • Increasing the speed results in a slightly finer surface quality. An increase in contact pressure results in a slightly coarser surface. The softer the workpiece material, the coarser the resulting surface (when using the same grit size).
  • For the best performance, use with a recommended peripheral speed of 3,000-4,000 SFPM. This provides an ideal compromise between stock removal rate, surface quality, thermal load on the workpiece and tool wear.
  • Use the appropriate grinding oil for the material to significantly increase the service life and the abrasive performance of the discs.
Safety notes
  • For safety reasons, the maximum permitted rotational speed indicated must never be exceeded.
  • The contact pressure has to be reduced significantly when the optimum rotational speed is exceeded.
  • Ensure the clamping depth is at least 5/8" and the specified maximum rotational speed is not exceeded with unsupported shank lengths.
Workpiece materials
Annealed cast iron
Cast steel
Grey/nodular cast iron (GG/GJL, GGG/GJS)
Hardened, heat-treated steels over 370 HV (38 HRC)
Stainless steel (INOX)
Steel materials with a hardness > 54 HRC
Steels up to 370 HV (< 38 HRC)
Step-by-step fine grinding
Structuring (matt finishing, brush matting and satin finishing)
Surface work
Work on weld seams
Compatible power tools
Flexible shaft drive
Straight grinder


recommends mounted flap wheels to reduce vibration and noise produced during use and to improve comfort when working.