Grier Abrasives A21-N2-17550 Mounted Point Fine Aluminum Oxide

Product Description

The GRIER ABRASIVES A21-N2-17550 is a ball-shaped mounted point abrasive designed for precision grinding, deburring, and surface finishing in metalworking and fabrication applications. It uses an aluminum oxide abrasive grain bonded in a unitized construction with a fine grade and medium density rating. The 1/4-inch diameter shank fits standard die grinders and rotary tools, and the point is rated to a maximum of 34,500 RPM. At 0.037 pounds, this is a lightweight consumable suited for close-tolerance work on ferrous and non-ferrous metals.

This mounted point is typically used in production grinding, weld cleanup, port matching, and contour finishing on metal parts. The ball shape allows access to concave surfaces, bores, and irregular profiles where flat wheels cannot reach. The fine grade makes it appropriate for finishing passes and light material removal where surface quality matters. It is used by machinists, fabricators, and tool-and-die professionals working with die grinders or bench-mounted flex shafts.

Key Features

• Ball shape (A21 point shape code) for grinding concave surfaces and internal profiles
• Aluminum oxide abrasive grain for use on steel, cast iron, and general ferrous metals
• Fine grade, medium density unitized bond for controlled material removal and smooth finish
• Rated to 34,500 RPM maximum for use with standard die grinders
• 1/4-inch shank diameter fits the most common collets and chucks
• Green color designation for quick identification in multi-point setups

Compatibility

Designed as an OEM-style replacement mounted point for use in die grinders and rotary tools accepting a 1/4-inch shank, suitable for metalworking and fabrication grinding applications.

Installation Notes

Mounted points are installed and serviced by machinists and metalworking professionals. Before mounting, verify that the spindle speed of the die grinder does not exceed the 34,500 RPM rating marked on this point. Tighten the collet or chuck securely before operation and inspect the abrasive for cracks or chips prior to each use. Always wear appropriate PPE including eye protection when operating rotary abrasives.