Tru-maxx 51031789M Square Polishing Stone 220 Grit 4 in

Product Description

The TRU-MAXX 51031789M is a square aluminum oxide polishing stone designed for fine surface finishing and deburring work on metal, tooling, and machined components. At 220 grit, it falls in the very fine range, making it well-suited for refining surfaces after coarser stock removal has been completed. The stone is oil-filled, which helps suspend swarf and maintain a consistent cutting action throughout use. With a 4-inch overall length and a 1-inch by 1-inch square cross-section, it provides a stable, flat contact face for hand honing and polishing tasks. Machinists, tool and die makers, and maintenance technicians are the primary users of this type of stone.

This polishing stone is used in precision metalworking environments including machine shops, tool rooms, and industrial maintenance settings. It is applied to flat surfaces, mold cavities, cutting tools, and fixtures where a fine, consistent finish is required. The square profile allows the user to work edges, corners, and flat faces with equal control. It is a hand-applied stone and does not require power equipment, making it a portable option for bench work or field maintenance tasks.

Key Features

• 220 grit aluminum oxide abrasive for very fine surface finishing
• Oil-filled construction helps flush swarf and maintain cutting efficiency
• Square profile provides flat contact surface for edges, corners, and flat faces
• 4-inch overall length offers adequate working surface for hand honing
• 1-inch by 1-inch cross-section for consistent, stable grip during use
• No power equipment required — suitable for bench and field applications

Compatibility

Designed as a hand-held polishing and honing stone for general metalworking, tool and die, and precision maintenance applications where a very fine 220 grit aluminum oxide abrasive is appropriate.

Installation Notes

This stone is applied by hand and requires no mounting or power tools. Secure the workpiece firmly before use, and apply a light honing oil or mineral oil to the stone surface to improve cutting action and prevent glazing. Work in consistent, overlapping strokes and periodically clean the stone surface to clear accumulated swarf. Inspect the stone for cracks or uneven wear before each use.