Norton 66243427938 Internal Grinding Wheel 60 Grit Type 5

Product Description

The NORTON 66243427938 is a Type 5 internal grinding wheel designed for precision bore and internal diameter grinding operations. Built with 60 grit aluminum oxide abrasive and a vitrified bond, this wheel delivers consistent material removal and controlled surface finish in internal grinding applications. The vitrified bond provides rigidity and porosity for efficient chip clearance. At K hardness and medium grade, it balances wheel life with cutting action. Rated to 21645 RPM maximum, it is suited for use on dedicated internal grinding machines. Machinists and tool and die professionals install this wheel as part of routine ID grinding setups.

This wheel is used in internal cylindrical grinding where the wheel must fit inside a bore or sleeve. The recessed single-side profile is the defining feature of the Type 5 form factor, allowing proper clearance in confined internal grinding applications. At 1.5 inches diameter, 0.375 inches hole size, and 1 inch thickness, it fits standard internal grinding spindle arbors used in production and toolroom environments. Typical applications include finishing bores in hardened steel components, tooling fixtures, and machine components requiring tight tolerances.

Key Features

• 60 grit aluminum oxide abrasive for medium material removal on ferrous metals and hardened steel
• Type 5 wheel form with recess on one side for clearance in internal grinding applications
• Vitrified bond construction provides rigidity, porosity, and consistent wheel geometry
• K hardness rating balances cutting efficiency with wheel longevity
• 21645 RPM maximum speed rating for safe use on standard internal grinding spindles

Compatibility

Designed as an OEM-style replacement or standard consumable for internal grinding machines accepting a Type 5 wheel with a 1.5 inch diameter, 0.375 inch arbor hole, and 1 inch thickness at the rated spindle speed.

Installation Notes

Installation should be performed by a qualified machinist or grinding equipment operator following the machine manufacturer's mounting instructions. Always verify the spindle RPM does not exceed the 21645 RPM maximum wheel speed rating before mounting. Inspect the wheel for cracks or chips using the ring test before installation, and never use a damaged wheel. Ensure all guards are in place and the machine is at a full stop before changing wheels.