Tru-maxx 51032431M Square Polishing Stone 400 Grit 4in

Product Description

The TRU-MAXX 51032431M is a square aluminum oxide polishing stone used for fine surface finishing, deburring, and edge honing on metal, ceramic, and composite workpieces. At 400 grit, it falls in the super fine range, making it suited for final-pass polishing where surface finish quality matters. The stone measures 4 inches in overall length with a 1-inch by 1-inch square cross-section, giving it a consistent contact face for flat surfaces. It is not oil-filled, so users apply their own honing oil or water-soluble coolant as needed. Machinists, toolmakers, and maintenance technicians working in fabrication or production environments are the primary users.

This polishing stone is used in hand-finishing operations on machine tool surfaces, mold and die work, precision shafts, valve seats, and general metalworking applications where a controlled, fine surface finish is required. The square geometry allows work in corners, slots, and tight profiles where round or tapered stones cannot reach. It is appropriate for both bench use and in-place finishing on installed components.

Key Features

• 400 grit super fine aluminum oxide abrasive for final-pass surface polishing
• Square cross-section (1 inch by 1 inch) works in corners, slots, and flat surfaces
• 4-inch overall length provides good hand control and leverage
• Not oil-filled — compatible with honing oil or water-soluble coolant of the user's choice
• Aluminum oxide construction offers consistent cut rate on ferrous and non-ferrous metals

Compatibility

Designed as a general-purpose hand polishing stone suitable for metalworking, machining, and maintenance finishing applications across a wide range of materials and workpiece types.

Installation Notes

This stone is a hand-held abrasive tool and does not require mechanical installation. Apply a light coat of honing oil or appropriate coolant to the stone face before use to prevent glazing and to carry away swarf. Keep consistent pressure and stroke direction to maintain a flat working surface on the stone. Inspect the stone periodically for uneven wear and dress as needed to restore a flat face.