Norton 66252942825 Type 5 Surface Grinding Wheel 7 in

Product Description

The NORTON 66252942825 is a Type 5 recessed surface grinding wheel engineered for aggressive stock removal on ferrous and non-ferrous metals. Built with an aluminum oxide abrasive grain and a vitrified bond, it delivers consistent cut rates and thermal stability throughout the grinding cycle. The wheel measures 7 inches in diameter by 1 inch thick with a 1-1/4 inch arbor hole and a one-side recess of 1/2 inch depth at 3 inches in diameter. Rated at a maximum of 3600 RPM and carrying a coarse 46-grit, G-hardness designation, this wheel suits high-removal-rate applications where surface finish is secondary to throughput. Weighing 2.93 pounds, it is sized for surface grinders and cylindrical grinders in production and maintenance shop environments.

This wheel is intended for use on surface grinders and cylindrical grinders in both production and maintenance settings. Material applications include 400 series stainless steel, hard carbon steels, soft carbon steels, tool steels, aluminum, cast iron, ductile iron, and gray iron. The coarse grit and soft hardness rating allow the wheel to cut freely on harder alloys while minimizing heat buildup and loading on gummy materials such as aluminum and cast iron. It is appropriate for both manual surface grinders and automatic reciprocating table machines in industrial or toolroom environments.

Key Features

• Type 5 recessed profile with a 1/2 inch deep, 3 inch diameter one-side recess for clearance on recessed-hub grinder flanges
• Aluminum oxide abrasive grain in the 32A series — suited for ferrous metals and select non-ferrous applications
• Vitrified bond provides rigidity, porosity, and consistent breakdown for controlled stock removal
• 46 grit coarse grade removes material quickly where surface finish is not the primary requirement
• G hardness (soft) grade allows the wheel to shed dull grains freely, reducing heat and glazing risk
• 3600 RPM maximum speed rating; confirm operating RPM does not exceed this value before mounting

Compatibility

Designed for use with surface grinders and cylindrical grinders. Compatible material applications include 400 series stainless, hard carbon steels, soft carbon steels, tool steels, aluminum, cast iron, ductile iron, and gray iron. Verify spindle speed, arbor size, and flange diameter match wheel specifications before installation.

Installation Notes

Grinding wheel installation and dressing should be performed by a qualified machinist or toolroom technician following ANSI B11.9 and OSHA 1910.215 safe guarding requirements. Always power down and lock out the grinder before mounting or removing a wheel. Inspect the wheel visually and perform a ring test before mounting; never use a wheel that shows cracks, chips, or damage. Use proper flanges, blotters, and a correctly sized arbor bushing to ensure concentric seating — never force a wheel onto a spindle.