Norton 66252849381 Type 27 Grinding Wheel 4.5in 20 Grit

Product Description

The NORTON 66252849381 is a Type 27 depressed-center grinding wheel designed for aggressive material removal on angle grinders and right-angle grinders. Built with aluminum oxide abrasive at a coarse 20 grit, it is bonded with a resinoid bond and reinforced for structural integrity under high-speed operation. The wheel measures 4.5 inches in diameter and 0.125 inches thick, with a 0.625-inch arbor hole. It carries a medium hardness rating (hardness code P) and is rated to a maximum of 13,580 RPM. The semi-friable grain structure allows the wheel to fracture and self-sharpen during use, maintaining cut rate on ferrous metals, welds, and castings.

This wheel is suited for fabrication shops, ironworkers, pipefitters, and maintenance trades that require a compact grinding wheel for weld grinding, surface preparation, and deburring. The 4.5-inch diameter fits standard 4.5-inch angle grinders commonly used in the field. The Type 27 depressed-center profile keeps the wheel hub clear of the workpiece, allowing flat or flush grinding at low angles. The coarse 20-grit designation makes this wheel appropriate for rapid stock removal rather than fine finishing work.

Key Features

• Type 27 depressed-center profile for flush and flat grinding applications
• Aluminum oxide abrasive, semi-friable, self-sharpening during use
• 20 grit coarse grade for aggressive stock removal
• Resinoid bond with reinforced construction for high-speed durability
• Medium hardness (code P) for consistent performance on ferrous metals
• Maximum operating speed of 13,580 RPM

Compatibility

Designed as a replacement-style Type 27 depressed-center wheel for 4.5-inch angle grinders with a 0.625-inch arbor. Confirm your grinder guard and spindle are rated for Type 27 wheels before installation.

Installation Notes

Installation and wheel changes must be performed by a qualified operator following ANSI B7.1 and grinder manufacturer guidelines. Disconnect and de-energize the grinder before mounting or removing a wheel. Inspect the wheel for cracks or chips before each use and perform a ring test; never use a damaged wheel. Do not exceed the maximum rated RPM of 13,580, and always use the appropriate guard for Type 27 wheels.