Value Collection 4150630 Square Polishing Stone 320 Grit

Product Description

The VALUE COLLECTION 4150630 is a square aluminum oxide polishing stone designed for fine finishing, deburring, and surface preparation on metal, plastic, and composite workpieces. At 320 grit, it falls in the extra fine category, making it well suited for refining surfaces after coarser abrasive work or for light material removal on close-tolerance parts. The stone measures 5/32 inches wide by 5/32 inches thick with a 4-inch overall length, giving technicians a narrow, manageable profile for reaching slots, keyways, bores, and other confined geometry. It is not oil-filled and requires no pre-soaking before use.

This polishing stone is a practical bench and field tool for machinists, tool-and-die workers, and maintenance technicians working on precision components. The square cross-section provides flat contact faces on all four sides, allowing the stone to be rotated as each face wears. Applications include edge breaking on hardened tooling, cleaning up parting lines, smoothing mating surfaces, and removing minor burrs left by milling, grinding, or EDM operations. It is sold individually but packaged in quantities of 12, making it a standard shop consumable for facilities that go through abrasive stones routinely.

Key Features

• Aluminum oxide abrasive for consistent cutting action on ferrous and non-ferrous metals
• 320 grit extra fine grade for final finishing and light deburring passes
• Square profile with four usable faces extends stone life before replacement
• 4-inch overall length provides sufficient hand grip and reach into confined areas
• 5/32-inch cross-section fits narrow slots, keyways, and small bores
• Not oil-filled — ready to use dry or with a light cutting fluid as preferred

Compatibility

Designed as a general-purpose replacement or consumable polishing stone for bench, hand, and reciprocating stone holders that accept a 5/32-inch square shank profile.

Installation Notes

Polishing stones of this type are installed by machinists and maintenance technicians without special tools in most hand-use applications. When used in a power honing fixture or reciprocating holder, ensure the holder clamp is fully secured before running the machine. Inspect the stone for chips or cracks before each use and discard any stone that shows structural damage. Keep stones away from excessive heat and store them flat to prevent warping or breakage.