Norton 66243529947 Internal Grinding Wheel 60 Grit

Product Description

The NORTON 66243529947 is a Type 1 internal grinding wheel designed for precision bore and internal diameter grinding operations. Built with aluminum oxide abrasive in a medium grade, 60-grit specification, it delivers consistent stock removal and surface finish on ferrous metals and similar materials. The vitrified bond holds abrasive grains firmly during aggressive cuts while still allowing controlled breakdown to expose fresh cutting edges. At 4 inches in diameter, 0.5 inches thick, and with a 0.5-inch hole, this wheel fits a range of internal grinding spindles used in production and tool-room environments. The wheel is rated to a maximum of 8,120 RPM. Installation and operation require an experienced machinist or grinding specialist.

This wheel is suited for internal grinding applications in manufacturing, tool-room, and maintenance machining environments. It is used on internal grinding machines to finish bores, bushings, bearing seats, and similar internal features on steel and cast iron workpieces. The medium grade and 60-grit combination make it appropriate for general-purpose stock removal where moderate surface finish is required. The vitrified bond performs well under coolant and at the moderate speeds typical of smaller-diameter internal grinding spindles.

Key Features

• 60-grit aluminum oxide abrasive for medium stock removal on ferrous workpieces
• Medium grade, K hardness rating for controlled abrasive breakdown during internal grinding
• Vitrified bond provides rigidity and compatibility with water-based coolants
• Semi-friable abrasive structure supports consistent cutting action and wheel life
• Type 1 straight wheel profile fits standard internal grinding spindle arbors
• Maximum operating speed of 8,120 RPM — do not exceed this rating

Compatibility

Designed as an OEM-style replacement or standard consumable for internal grinding machines that accept Type 1 straight wheels with a 4-inch diameter, 0.5-inch hole, and 0.5-inch face width.

Installation Notes

Installation must be performed by a qualified machinist or grinding specialist following ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels. Always ring-test the wheel before mounting and inspect for cracks or damage — never mount a damaged wheel. Power down and lock out the grinding machine before changing wheels. Verify that the machine spindle speed does not exceed the 8,120 RPM maximum rating marked on the wheel, and use appropriate flanges and blotters as required by the machine manufacturer.