Norton 66252939521 Surface Grinding Wheel 150 Grit 7in

Product Description

The NORTON 66252939521 is a Type 1 surface grinding wheel designed for precision stock removal and finish grinding on metallic workpieces. Built with aluminum oxide abrasive and a vitrified bond, this wheel delivers consistent cutting action across a broad range of ferrous materials. It measures 7 inches in diameter, 1/4 inch thick, with a 1-1/4 inch arbor hole, and carries a 150 grit, Very Fine grade rating with an M hardness code. The semi-friable abrasive structure self-sharpens during use, helping maintain cut rate on difficult materials. Rated to 3600 RPM, it is suited for use on surface grinders, cylindrical grinders, and CNC cutting tool machines.

This wheel is intended for use on soft carbon steels, tool steels, and super alloys in professional machining and toolroom environments. It fits standard surface grinder spindles accepting a 1-1/4 inch bore. The Type 1 straight-wheel profile makes it appropriate for flat surface grinding operations as well as cylindrical grinding applications. It is identified by the manufacturer specification code 38A150-MV, which designates the abrasive type, grit, hardness, and bond within the 38A series.

Key Features

• Aluminum oxide abrasive, white wheel color, semi-friable structure for consistent self-dressing action
• Vitrified bond provides rigidity and porosity control suited to precision grinding
• 150 grit Very Fine grade for finish grinding and light material removal
• M hardness (Medium) balances wheel life against cut rate on ferrous alloys
• Non-porous, non-tapered Type 1 straight profile with no recess
• Rated to 3600 RPM maximum operating speed

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Suitable for grinding soft carbon steels, tool steels, and super alloys. Fits spindles with a 1-1/4 inch arbor bore.

Installation Notes

Grinding wheel mounting and dressing should be performed by a qualified machinist or grinding machine operator following the machine manufacturer guidelines and applicable ANSI B11 safety standards. Always power down and isolate the grinder before changing wheels. Inspect the wheel for cracks or chips before mounting, perform a ring test, and never exceed the rated maximum RPM of 3600. Use the correct reducing bushings if required to match the spindle arbor size, and ensure flanges and blotters are properly seated before tightening.