Blue Flap Discs

These new, fiberglass backed, flap discs have high-density flaps, made of hard zirconia-alumina alloy, which lasts longer that normal Zirconia abrasive discs.  All flap discs are available from 36-80 grit and Type 27 and 29.

Delta Force


Our new premium flap discs.  These are made of high quality flaps, pressed into a high density to maximize usage lifespan.


The Ironside

New, High-Density Flap Discs


New, Medium-Density Flap Discs

Specifications & Applications

Used on a variety of metals and alloys for rust removal, deburring, edge-grinding, and seam-blending. 


  • Applications: Deburring, Finishing, Grinding, Polishing

  • Attachment type: Standard

  • Backing: Fiberglass

  • Bonding: Resin over resin

  • Center hole diameter (in): 7/8

  • Diameter (in): 4.5

  • Grit type: 36 ~ 80

  • Mineral: Zirconia Alumina

  • Max RPM: 13300



Special Technology & Performance: Longer, Faster, More Precise Grinding:

All Kelco's flap discs are manufactured with hard-pressed flaps. A standard flap disc with unpressed flaps tends to “chatter” during the grinding process, generating vibrations and resulting in the grit pulling away from the mounting prematurely. Hard pressed discs allow for the following:

  • Regular grinding

  • Maximum grinding capacity

  • Longer service life (2-3 times the longevity of non-pressed flaps)

  • Minmized risk of flap tearing


  • Saving time and cost, flap discs grinds and blends work pieces at the same time.

  • For light duty grinding and finishing, flexible, X-weight cotton backing is ideal. For heavier duty grinding, use stiffer, Y-weight backing.

  • One of the strongest bonds available today, the abrasive is "resin-bonded" to the backing. This allows for longer life of the disc as the resin-bond minimizes the risk of abrasive minerals separating from the backing due to heat.

  • Alumina zirconia self-sharpens, provides extended life and more cutting power than aluminum oxide, reducing replacement costs. Ceramic can be used wet. 

With merely one disc, Kelco flap discs allow for a variety of applications: low-pressure grinding, small weld removal, finishing, and surface preparation. Although these discs spin rapidly enough for stock removal, the flaps cushion the work-piece, allowing for a soft finish. Flap discs can kill two birds with one stone: it is an alternative to the combination of bonded wheels and fiber discs.


Kelco zirconia alumina flap disc can be applied to various metal types. It has a superior cut-rate to aluminum oxide. The abrasive is resin-coated to resist heat, and its X-weight polyester-cotton backing allows for a clean, efficient cut for light duty grinding and finishing.

Flap discs are essentially grinding discs but with more depth as they have overlapping layers arranged around a center hub. Due to their overlapping construction, more abrasive material can be loaded onto the cutting surface. Continually wearing away with use, these abrasive-coated, fiber-reinforced flaps expose fresh mineral for an efficient, consistent cut. As a result, they have far longer longevity than typical discs. The closed coat on Kelco flap discs means that on the backing itself, the abrasive particles are arranged as close to each other as possible. As a result, the flap disc provides for a deep cut and consistent finish.They are ideal for a large range of applications: small-weld project grinding, edge grinding, weld seam blending, de-burring, and rust removal. 

Please note: In most cases, flap discs produce a finish one grade finer than the product itself is graded. Most right angle grinders are easily adapted to all flap discs.