Tru-maxx 66253269551 Surface Grinding Wheel 46 Grit

Product Description

The TRU-MAXX 66253269551 is a Type 1 surface grinding wheel designed for precision stock removal and surface finishing on ferrous metals and hard materials. Built with aluminum oxide abrasive grain and a vitrified bond, this wheel delivers consistent cutting action and maintains its shape under sustained load. It carries an I hardness rating (soft-range), a grain structure of 6, and a specification designation of 28A46I6V31. The 7 inch diameter and 1/2 inch face width make it well-suited for reciprocating and rotary surface grinders used in tool rooms and general machining environments. Rated to 3600 RPM maximum, it suits a broad range of standard surface grinding spindle speeds.

This wheel is a standard fit for horizontal-spindle surface grinders accepting a 7 inch diameter, 1/2 inch wide, Type 1 straight wheel with a 1-1/4 inch arbor bore. The coarse 46 grit is selected for aggressive stock removal rather than fine finishing passes. Semi-friable aluminum oxide grain fractures progressively to expose fresh cutting edges, which helps reduce glazing on medium-to-hard workpieces. Machinists, tool-and-die workers, and maintenance grind technicians typically use this wheel configuration for flat surface work, deburring, and reconditioning of tooling and fixture components.

Key Features

• Type 1 straight wheel profile with no recess — mounts directly on standard surface grinder arbors
• 46 grit coarse aluminum oxide abrasive for aggressive stock removal
• Vitrified bond provides rigidity and open structure for free cutting action
• I hardness (soft range) releases dull grain readily, reducing heat buildup on workpiece
• Semi-friable grain structure (rating 6) balances sharpness retention with controlled breakdown
• White wheel color indicates a friable, cooler-cutting aluminum oxide formulation

Compatibility

Designed as an OEM-style replacement or standard consumable for horizontal-spindle surface grinders accepting a Type 1 straight wheel measuring 7 inches diameter, 1/2 inch thick, with a 1-1/4 inch arbor hole and a maximum spindle speed of 3600 RPM or lower.

Installation Notes

Surface grinding wheels must be installed by qualified personnel following ANSI B11.22 and OSHA 1910.215 grinder safety standards. Before mounting, perform a ring test by tapping the wheel lightly — a clear tone indicates no cracks; a dull thud indicates the wheel should be discarded. Ensure the machine spindle speed does not exceed the 3600 RPM rating marked on the wheel. Use proper flange hardware and blotters as required, and always run a new wheel under the guard for at least one minute at operating speed before presenting work.