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Norton® Quantum™3 66253370794 SG Series Depressed Center Wheel, 4-1/2 in Dia x 1/4 in THK, 7/8 in Center Hole, 20 Grit, Ceramic Alumina Abrasive



Norton® Quantum™3 Depressed Center Wheel, Series: SG Series, 4-1/2 in Wheel Diameter, 1/4 in Wheel Thickness, 7/8 in Center Hole, Arbor Connector, 20 Grit, Extra Coarse Grade, Ceramic Alumina Abrasive, Wheel Type Number: Type 27, 13580 rpm Maximum, Resin Bond, Applicable Materials: 400 Series Stainless, Hard Carbon Steel and Soft Carbon Steel, Wheel Hardness: P, Specifications Met: ANSI Specified

Depressed center wheels may also be referred to as raised hub wheels or by their shape designation Type 27, 28 or 29, with Type 27 being the most popular. The depressed center design allows the flange/lock nut to recess within the wheel so that it can be used for various grinding and cutting applications. Depressed center wheels are designed to handle the most severe right angle grinding applications from heavy stock removal to rough blending. More recently, depressed center wheels have been designed for cut-off applications when the tool is proper designed with flanges and guards. While large right angle grinders (7 in & 9 in) have been around for many years, small or mini grinders that handle 4 in, 4-1/2 in and 5 in wheels have made this machine, and wheel category, the most popular in power tools.


Abrasive Material Ceramic Alumina
Applicable Materials 400 Series Stainless, Hard Carbon Steel and Soft Carbon Steel
Bond Type Resin
Center Hole Size 7/8 in
Connector Type Arbor
Grade Extra Coarse
Grit 20
Maximum Speed 13580 rpm
Series SG Series
Specifications Met ANSI Specified
Wheel Diameter 4-1/2 in
Wheel Hardness P
Wheel Thickness 1/4 in
Wheel Type Number Type 27

Country of Origin: United States

Standards and Approvals: ANSI Specified

Stock Removal Applications


  • 100% of the most advanced ceramic alumina abrasive grain with a special shape for 5 to 6 times the life of aluminum oxide wheels, up to 100% increase in performance and life over competitive ceramic alumina wheels
  • 1/4 in are designed for offhand stock removal, smoothing welds and beveling
  • Fastest metal removal rates with a high level of overall life and comfortable grinding action for those who can measure performance
  • Ideal for stainless steel and carbon steel applications, efficiently grinds and cuts a variety of materials from alloys to gray iron


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