Flex Hones

A flex hone is a cylindrical tool with abrasive nylon filaments used to remove glaze, deburring, and create a crosshatch surface finish inside bores and cylinders; it’s commonly used for engine cylinders, hydraulic bores, and metalworking finishing tasks

Select grit based on material and finish goal—coarser grits (around 80–120) remove material faster for deburring, medium grits (180–240) are common for general finishing, and fine grits (280+) produce smoother surfaces; choose a hone diameter slightly smaller than the bore so the abrasive filaments press against the walls, and match shank size to your drill or tool holder

Yes; different abrasive types suit different materials—aluminum and softer metals typically use non-ferrous or fine abrasives to prevent clogging, while ferrous metals and cast iron often use silicon carbide or aluminum oxide abrasives designed for harder surfaces

Use a slow, consistent rotation speed and apply light, even pressure while moving the hone in and out of the bore to maintain a crosshatch pattern; always secure workpieces, wear eye and respiratory protection, and follow manufacturer speed and feed recommendations to avoid overheating or filament damage

Clean hones after use with solvent or an appropriate cleaner to remove debris and oils, dry thoroughly, avoid excessive force during use to prevent filament breakage, and store in a dry place away from direct sunlight and compressive loads to maintain filament shape

Common accessories include a drill or low-RPM motor with a compatible chuck, a supporting arbor or guide for long bores, appropriate cutting fluid or honing oil to flush chips and cool the cut, and personal protective equipment such as safety glasses and gloves