Norton 66243529845 Internal Grinding Wheel 46 Grit

Product Description

The NORTON 66243529845 is a Type 1 straight-profile internal grinding wheel designed for precision bore and internal diameter grinding operations. Built with aluminum oxide abrasive and a vitrified bond, this wheel delivers consistent stock removal on ferrous metals and hard materials in production grinding environments. It measures 4 inches in diameter with a 1/2-inch hole and 1/2-inch thickness, and is rated to a maximum of 8,120 RPM. The coarse 46-grit specification makes it well suited for aggressive material removal rather than finish work. It carries a K hardness rating and no recess profile. Machinists, toolroom technicians, and grinding specialists are the primary installers and operators.

This wheel is used in internal grinding applications where bore finishing, ID grinding, or internal diameter cleanup is required. The 4-inch diameter and 1/2-inch arbor hole fit standard internal grinding spindle configurations. The coarse grit and vitrified bond combination perform reliably on steel, cast iron, and similar hard materials in both job-shop and light production settings. It ships as a single unit and is rated for the spindle speeds common to bench and pedestal-style internal grinding machines.

Key Features

• Type 1 straight wheel profile with no recess for standard internal grinding spindle mounting
• Aluminum oxide abrasive with 46 coarse grit for aggressive stock removal
• Vitrified bond provides rigidity and consistent grain exposure throughout wheel life
• Medium hardness rating (K) balances wheel wear against cutting efficiency
• 8,120 RPM maximum operating speed stamped for compliance verification
• Gray color for quick visual identification as a standard aluminum oxide vitrified wheel

Compatibility

Designed as an OEM-style replacement and standard-supply internal grinding wheel for spindles accepting a 1/2-inch arbor hole with a 4-inch diameter Type 1 wheel form.

Installation Notes

Internal grinding wheels must be mounted and operated by qualified grinding machine operators following ANSI B11.9 and OSHA abrasive wheel standards. Always inspect the wheel for cracks or chips before mounting and perform a ring test. Never exceed the 8,120 RPM maximum speed rating. Ensure guards are in place and the spindle is fully stopped before changing wheels.