Norton 66260273560 Cbn Grinding Wheel 150 Grit 12 Inch

Product Description

The NORTON 66260273560 is a Type 1A1 CBN (Cubic Boron Nitride) surface grinding wheel with a resinoid bond, designed for precision grinding of ferrous metals and hardened steels. At 150 grit with a Very Fine grade and Hardness Code T (Medium hardness rating), this wheel delivers controlled stock removal and refined surface finishes in one setup. The 12-inch diameter and 1/4-inch superabrasive depth make it well-suited for surface grinder applications where consistent geometry and finish quality are required. Licensed grinding professionals and tool room machinists are the primary installers and operators of this wheel.

This CBN grinding wheel is used in surface grinding operations on hardened ferrous workpieces, including tool steels, high-speed steels, and similar difficult-to-grind materials. The resinoid bond provides a degree of self-dressing action and vibration damping, which supports both roughing and finishing passes. With a superabrasive concentration of 75 and the Norton CBN series designation CB150-TB99-1/4, this wheel targets production and tool room environments where wheel life and dimensional consistency matter. It is suited for horizontal spindle surface grinders accepting a 5-inch hole and 12-inch diameter wheel.

Key Features

• CBN (Cubic Boron Nitride) abrasive material for long wheel life on hardened ferrous metals
• Type 1A1 straight wheel geometry for use on horizontal spindle surface grinders
• 150 grit Very Fine grade produces refined surface finishes while maintaining stock removal capability
• Resinoid bond provides vibration damping and controlled self-dressing action
• Superabrasive concentration of 75 balances aggressiveness and wheel durability
• No recess, no taper — straightforward mounting on standard 5-inch hole arbors

Compatibility

Designed for horizontal spindle surface grinders accepting a 12-inch diameter, 1/2-inch thick Type 1A1 wheel with a 5-inch hole bore. Suitable for roughing and finishing applications on hardened ferrous materials per Norton CBN series specifications CB150-TB99-1/4.

Installation Notes

CBN grinding wheels must be mounted and dressed by a qualified grinding machine operator following the machine manufacturer's wheel speed and flanging requirements. Always verify that the grinder spindle speed does not exceed the wheel's rated maximum RPM before mounting. Power down and lock out the grinder before changing wheels. Inspect the wheel for cracks or chips prior to installation and never force the wheel onto the arbor — the fit should be snug without requiring impact.