Norton 66243529782 Internal Grinding Wheel 100 Grit

Product Description

The NORTON 66243529782 is a Type 1 internal grinding wheel designed for precision bore and internal diameter grinding operations. Built with aluminum oxide abrasive in a vitrified bond, this wheel delivers consistent stock removal and finish control in ferrous and general-purpose grinding applications. It measures 4 inches in diameter, 1/4 inch thick, and carries a 1/2-inch hole size, with a maximum operating speed of 8,120 RPM. The semi-friable grain structure supports controlled breakdown for self-sharpening action, making it well suited for production and tool room environments where finish consistency matters.

This wheel is intended for internal grinding applications on machining centers, dedicated internal grinders, and tool post grinder setups. The fine, 100-grit rating and medium hardness (I-grade) make it appropriate for finishing passes on bores, cylinders, and bushings where tight tolerances and surface finish are priorities. Machinists, tool grinders, and industrial maintenance professionals are the primary installers and operators of this wheel type.

Key Features

• 100-grit aluminum oxide abrasive for fine material removal and smooth finish on internal bores
• Vitrified bond provides rigidity and consistent wheel breakdown during grinding cycles
• Semi-friable grain structure promotes self-sharpening action and extended wheel life
• Medium hardness (I rating) balances wheel wear against cutting efficiency
• No-recess Type 1 straight wheel profile for straightforward mounting on internal grinding spindles
• Rated to 8,120 RPM maximum operating speed

Compatibility

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

Installation Notes

Internal grinding wheels must be installed and dressed by a qualified machinist or grinding technician following ANSI B11.22 and OSHA 1910.215 grinding safety standards. Always power down and lock out the grinder before mounting or removing a wheel. Inspect the wheel for cracks or chips before installation and perform a ring test prior to use. Never exceed the maximum RPM marked on the wheel or listed by the machine manufacturer, whichever is lower.