Tru-maxx 66253255678 Surface Grinding Wheel 80 Grit

Product Description

The TRU-MAXX 66253255678 is a Type 1 surface grinding wheel designed for precision stock removal and surface finishing on ferrous metals. Built with aluminum oxide abrasive and a vitrified bond, it delivers consistent cut rates and good form retention throughout its service life. The wheel measures 7 inches in diameter, 1/2 inch thick, with a 1-1/4 inch arbor hole, and carries an 80 grit, H hardness rating — a medium-soft specification well suited to grinding hardened steels and tool steels where controlled material removal is the priority. Rated to 3600 RPM, it is installed on surface grinders by machinists and tool-and-die professionals in production and maintenance environments.

This wheel is a standard fit for horizontal-spindle surface grinders accepting a 7 inch diameter, 1/2 inch face wheel with a 1-1/4 inch bore. The 80 grit provides a balance between aggressive stock removal and a reasonably smooth finish, making it a practical choice for general surface grinding work on ferrous workpieces. The semi-friable aluminum oxide grain self-sharpens under load, reducing the frequency of dressing cycles and helping maintain consistent surface finish quality across longer runs.

Key Features

• Type 1 straight wheel profile for horizontal-spindle surface grinders
• Aluminum oxide abrasive grain — semi-friable, suitable for hardened steels and tool steels
• Vitrified bond provides rigidity and good form retention
• 80 grit, H hardness (Grain Structure 6) — medium-soft grade for controlled stock removal
• Non-porous construction; no recess; pink wheel color indicates aluminum oxide composition
• Maximum operating speed: 3600 RPM

Compatibility

Designed as a replacement-style surface grinding wheel for horizontal-spindle surface grinders that accept a 7 inch diameter, 1/2 inch wide, 1-1/4 inch bore Type 1 straight wheel.

Installation Notes

Surface grinding wheels must be installed by a qualified machinist or grinding machine operator following ANSI B11.23 safety guidelines. Before mounting, perform a ring test to check for cracks and verify that the machine spindle speed does not exceed the wheel's 3600 RPM maximum operating speed. Use proper blotters and flanges; never overtighten the spindle nut. Allow the wheel to run at operating speed for at least one minute before bringing it into contact with the workpiece.