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Green 7 inch Type 27 depressed center grinding wheel with threaded 5/8-11 hub

3M

3M 55959 Depressed Center Wheel Type 27 7 in .25 in 5/8-11

SKU CH-213F-3K6BN MPN 55959

A 7-inch Type 27 ceramic grinding wheel with a 5/8-11 threaded arbor for angle grinders, rated to 8,500 RPM and built for steel

  • Product typeSanders
  • Product weight1.06
  • Type 27 depressed centre for aggressive grinding on steel
  • Ceramic abrasive cuts faster and lasts longer on tool steel
  • 5/8-11 threaded hub mounts directly on angle grinders
  • 8,500 RPM maximum speed matches high-output grinders
  • Extra-coarse 36 grit removes heavy stock in fewer passes

3M Green Corps 7 in Type 27 wheel

The 3M 55959 is a depressed-center grinding wheel built for angle grinders. Its 7 in diameter and 0.25 in thickness suit heavy stock removal on steel and tool steel. The ceramic abrasive runs at up to 8,500 RPM with a 5/8-11 threaded hole.

Replaces worn Type 27 wheels on steelwork

Swap it in when the current wheel has lost its edge or when the job calls for the extra-coarse 36 grit Green Corps blend. The ceramic grain keeps cutting longer than conventional aluminum-oxide wheels, so the change pays off on high-volume grinding tasks.

Check grinder speed and arbor fit

Verify the tool’s no-load RPM does not exceed 8,500 and that it accepts a 5/8-11 threaded arbor. Confirm the guard is rated for a 7 in Type 27 wheel and that the workpiece is steel or tool steel, the only materials specified.

How it compares

Measured against everything we stock in Sanders, Rotary & Demolition Tools, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 60% of the 477 comparable items (median $21.99).

Specifications

Product
Brand name3M
Model name55959
Product typeSanders

Questions about this item

Will the 5/8"-11 threaded hole fit my angle grinder spindle?

The wheel uses a 5/8"-11 threaded hole that matches standard angle-grinder spindles of the same size.

What is the correct way to mount this Type 27 wheel so it runs true?

Thread the wheel onto the spindle by hand, then tighten with the grinder's lock-nut wrench while holding the spindle lock; do not overtighten.

How will I know when this 36-grit ceramic wheel needs replacing?

Replace the wheel when the abrasive surface wears down to the backing or when vibration increases during grinding.

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