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Pricelist: General Price List (USD) Pricelist
Pricelist: General Price List (USD) Pricelist

Alpha® Vextra™ Flat Diamond Grinding Disc 4-1/2", #50, 7/8" Arbor (VDD4550)

The Alpha® Vextra™ flat diamond grinding disc is engineered for grinding steel, stainless steel and non-ferrous metals where spark mitigation matters — including explosive (Ex) zones. Its sandwich construction with rubber damping makes the disc light, reduces vibration and noise, and minimizes operator fatigue. An optimized diamond grit and layer arrangement deliver long life and consistent performance — users typically report 50–60× the life of conventional abrasives. This listing is VDD4550: 4-1/2" diameter, #50 grit, 7/8" arbor for high-speed angle grinders.

Features

  • Designed to grind steel, stainless steel and non-ferrous metals with spark mitigation
  • Removes rust, burrs, mill scale and paint on metal surfaces without clogging
  • Eliminates epoxy, glues and adhesives cleanly
  • Also runs on natural stone, engineered stone/quartz, wood and rubber
  • Sandwich construction with rubber damping reduces noise and vibration
  • Optimized diamond grit and layer arrangement for consistent, aggressive cut
  • Up to 50–60× the life of conventional abrasive discs
  • Available 4-1/2", 5", and 7" with 7/8" arbor or 5/8"-11 zinc hub
Part No. Diameter Grit Arbor Max RPM UPC
VDD4550 4-1/2" 50 7/8" 13,200 RPM 749173670565
VDD4535 4-1/2" 35 7/8" 13,200 RPM 749173670541
VDD453H 4-1/2" 35 5/8"-11 13,200 RPM 749173670558
VDD455H 4-1/2" 50 5/8"-11 13,200 RPM 749173670572
VDD4580 4-1/2" 80 7/8" 13,200 RPM 749173670664
VDD458H 4-1/2" 80 5/8"-11 13,200 RPM 749173670671
VDD5035 5" 35 7/8" 12,200 RPM 749173670220
VDD503H 5" 35 5/8"-11 12,200 RPM 749173670237
VDD5050 5" 50 7/8" 12,200 RPM 749173670244
VDD505H 5" 50 5/8"-11 12,200 RPM 749173670251
VDD5080 5" 80 7/8" 12,200 RPM 749173670589
VDD508H 5" 80 5/8"-11 12,200 RPM 749173670596
VDD7035 7" 35 7/8" 8,400 RPM 749173670602
VDD703H 7" 35 5/8"-11 8,400 RPM 749173670619
VDD7050 7" 50 7/8" 8,400 RPM 749173670626
VDD705H 7" 50 5/8"-11 8,400 RPM 749173670633
VDD7080 7" 80 7/8" 8,400 RPM 749173670640
VDD708H 7" 80 5/8"-11 8,400 RPM 749173670657
  1. Confirm the disc diameter and arbor match your grinder — this VDD4550 is 4-1/2" with a 7/8" arbor.
  2. Mount on a high-speed angle grinder, sander or polisher using the tool's original flange and lock nut (7/8" arbor models) or thread directly onto the spindle (5/8"-11 zinc-hub models).
  3. Verify grinder no-load RPM does not exceed the disc Max RPM (13,200 RPM for 4-1/2", 12,200 RPM for 5", 8,400 RPM for 7").
  4. Start with #35 grit for aggressive stock removal, #50 for general purpose, #80 for finer finish work.
  5. Run dry, or feed water at the disc face to keep dust down — the Vextra works wet.
  6. For virtually dust-free grinding, pair with an Ecoguard G retrofit and a HEPA vacuum. Note: some metal powders are combustible — confirm material safety before vacuum collection.
  7. Inspect the disc before each use; replace if cracked, glazed or worn below useful diamond depth.
Vextra Flat Diamond Grinding Disc 4-1/2", 50 grit — VDD4550
Part No. VDD4550
UPC 749173670565
Type Vextra Flat Diamond Grinding Disc 4-1/2", 50 grit
Max RPM 13,200 RPM
Packaged Weight 0.50 lbs
Commodity Code 6804.21.0000
Country of Origin Korea
Property Detail
Type Flat diamond grinding disc, sandwich construction with rubber damping
Primary Materials Steel, stainless steel, non-ferrous metals; also stone, quartz, wood, rubber
Grits Available #35 (coarse), #50 (medium), #80 (fine)
Diameters Available 4-1/2", 5", 7"
Arbors Available 7/8" or 5/8"-11 zinc hub
Use High-speed angle grinder, sander, or polisher; dry or wet
Country of Origin Korea
How long does the Vextra disc last compared to conventional abrasives?

Life depends on application and material, but users typically see 50–60× the life of conventional abrasive discs.

Can I use the Vextra disc with water to keep dust down?

Yes — the Vextra Flat Diamond Grinding Disc is designed to run wet as well as dry. Feed water at the disc face to suppress dust.

How do I eliminate dust during grinding?

Alpha offers the Ecoguard G retrofit dust shroud for most 4-1/2" and 5" industrial grinders. Combined with a HEPA vacuum, the Vextra runs virtually dust-free. Note: some metal powders are combustible — verify material safety before vacuum collection.

What tools can I use with the Vextra disc?

High-speed angle grinders, sanders and polishers. Use the tool's original flange and lock nut on 7/8"-arbor models, or thread the 5/8"-11 zinc-hub models directly onto the spindle.

Does Alpha offer a square arbor for the Ecogrinder?

A square arbor suitable for the Ecogrinder is available upon request.

Which grit should I choose?

#35 for aggressive stock removal (rust, mill scale, weld dressing). #50 for general-purpose grinding (this listing). #80 for finer finish work.

Vextra Flat Grinding Discs

⚠ WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. Always wear appropriate PPE.