Norton 66252849374 Type 27 Grinding Wheel 4.5in 20 Grit

Product Description

The NORTON 66252849374 is a Type 27 depressed-center grinding wheel designed for aggressive material removal on metal surfaces. Measuring 4.5 inches in diameter and 0.25 inches thick with a 0.625-inch arbor hole, this wheel mounts on standard 4.5-inch angle grinders. The aluminum oxide abrasive runs at a coarse 20 grit with a medium hardness rating and semi-friable bond, making it well-suited for stock removal, weld grinding, and surface conditioning on ferrous metals. The resinoid bond construction provides durability under sustained load, and the reinforced fiberglass construction supports safe operation up to 13,580 RPM.

This wheel is used in fabrication shops, structural steel work, and maintenance welding applications where fast, aggressive grinding is required. It is installed on 4.5-inch right-angle grinders by licensed welders, ironworkers, pipefitters, and general metalworking tradespeople. The coarse 20-grit aluminum oxide abrasive is particularly effective on carbon steel and other ferrous workpieces where a fine finish is not the objective and maximum metal removal rate is the priority.

Key Features

• Type 27 depressed-center profile provides clearance for flat surface and weld grinding
• Coarse 20-grit aluminum oxide abrasive for aggressive stock removal
• Semi-friable grain continually exposes fresh cutting edges during use
• Resinoid bond with medium hardness rating balances cut rate and wheel life
• Reinforced fiberglass construction rated to 13,580 RPM
• 0.625-inch arbor hole fits standard angle grinder spindles

Compatibility

Designed as an OEM-style replacement grinding wheel for 4.5-inch angle grinders accepting a Type 27 depressed-center wheel with a 0.625-inch arbor hole.

Installation Notes

Installation should be performed by a qualified operator following ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels. Before mounting, inspect the wheel for cracks or damage and verify the grinder spindle speed does not exceed the 13,580 RPM maximum rated speed of the wheel. Disconnect power to the grinder before changing wheels, and ensure the arbor nut is tightened securely using the appropriate spanner wrench. Always use the guard supplied with the grinder and wear appropriate eye and face protection during operation.