Norton 66243427769 Type 5 Internal Grinding Wheel 60 Grit

Product Description

The NORTON 66243427769 is a Type 5 recessed internal grinding wheel designed for precision bore and internal diameter grinding operations. It measures 1 inch in diameter by 1 inch thick with a 1/4 inch hole, and it is constructed from aluminum oxide abrasive bonded with a vitrified bond. The wheel is rated at a maximum of 32,470 RPM and carries a K hardness rating with a medium grade structure. Aluminum oxide abrasive is well suited for grinding ferrous metals including carbon steels, alloy steels, and cast iron. This wheel is installed and used by tool-and-die makers, machinist shops, and grinding specialists performing internal bore finishing work.

This wheel is intended for internal grinding applications where a recessed Type 5 profile is required to clear fixture or chuck geometry. The one-side recess design allows proper mounting clearance in internal grinding spindle setups. Typical use cases include finishing bores in hydraulic cylinders, bearing housings, valve bodies, and precision tooling components. The 60-grit designation delivers a balance of material removal rate and surface finish quality appropriate for roughing and semi-finishing passes on steel and iron workpieces.

Key Features

• Type 5 one-side recessed profile for internal bore grinding clearance
• 60-grit aluminum oxide abrasive for effective stock removal on ferrous metals
• Vitrified bond provides rigidity and consistent cut performance
• K hardness medium grade suits a wide range of steel and cast iron applications
• 32,470 maximum RPM rating for high-speed internal grinding spindles
• Compact 1 inch diameter by 1 inch thick form factor for small bore work

Compatibility

Designed as an OEM-style replacement or standard consumable for internal grinding machines accepting Type 5 recessed wheels with a 1/4 inch arbor hole and 1 inch diameter.

Installation Notes

Internal grinding wheels must be installed by a qualified machinist or grinding machine operator. The grinding machine spindle must be fully de-energized and locked out before mounting or removing any wheel. Always inspect the wheel for cracks or chips before mounting and perform a ring test per ANSI B7.1 safety standards. Do not exceed the maximum RPM rating marked on the wheel or its packaging.