BlueFire® Depressed Center Grinding Wheel, 4-1/2" Dia x 1/4" THK, 7/8" Center Hole, 24 Grit, Zirconia Alumina
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Norton® BlueFire® Depressed Center Wheel, 4-1/2 in Wheel Dia, 1/4 in Wheel Thickness, 7/8 in Center Hole, Arbor Connector, 24 Grit, Extra Coarse Grade, Zirconia Alumina Abrasive, Wheel Type Number: Type 27, 13580 rpm Maximum, Resin Bond, Applicable Materials: High Tensile Steel, Mild Carbon, Stainless Steel, Alloy and Cast Iron, Wheel Hardness: S, Black Wheel, Yes Reinforced, ANSI Specified Specifications Met
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.
