Norton 66243530387 Type 11 Grinding Wheel 4 in 60 Grit

Product Description

The NORTON 66243530387 is a Type 11 vitrified aluminum oxide grinding wheel designed for tool grinding and surface finishing applications. With a 4-inch diameter, 60 grit, and J hardness rating, this wheel delivers consistent medium-grade stock removal on ferrous metals and toolroom workpieces. The white aluminum oxide abrasive is friable, meaning it fractures during use to expose fresh cutting edges, reducing heat buildup and maintaining a free-cutting action. Rated to a maximum of 5,730 RPM, it is suited for bench grinder and pedestal grinder use in maintenance, toolroom, and light fabrication environments. Specification designation is 38A60-JVBE.

This wheel is used in toolroom, maintenance, and production grinding where controlled material removal and consistent finish are required. The Type 11 (flaring cup) profile makes it appropriate for grinding tool faces, punch faces, and similar workpiece geometries. At 4 inches in diameter with a 1-1/4-inch hole, it fits standard bench grinder arbors common in trade shops. Machinists, tool and die technicians, and maintenance mechanics are the primary users. The medium grit and vitrified bond suit general-purpose tool sharpening and light precision grinding where aggressive cutting is not required.

Key Features

• Type 11 flaring cup profile for tool face and punch grinding
• White aluminum oxide abrasive (38A) — friable for cool, free-cutting action
• Vitrified bond (V) for rigidity and consistent performance
• 60 grit, J hardness (medium grade) for controlled stock removal
• Maximum operating speed of 5,730 RPM
• Non-porous structure; white wheel color for easy dressing visibility

Compatibility

Designed as an OEM-style replacement or standard toolroom grinding wheel for bench grinders and pedestal grinders accepting a 1-1/4-inch arbor hole. Fits grinders configured for Type 11 cup wheels with a 4-inch diameter.

Installation Notes

Grinding wheel installation should be performed by a qualified machinist or maintenance technician following ANSI B7.1 safe-use 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; never mount a damaged wheel. Confirm the machine RPM rating does not exceed the wheel maximum of 5,730 RPM before operating.