White Buffing Ball Stone - diam. 40mm - 5-14-340KL
- Buffing ball, stone, 40mm diameter. Pumice texture. With solid, 6mm metal pin.
Ball-Shaped Pumice Stone Ø 40 mm with Shank – Rubber Roughening Tool
Stone abrasive on a metal shank | Max. 7000 RPM | Sold as 1 pc.
Before a tire repair goes ahead, the rubber surface needs to be properly roughened up — that's what lets the cement and repair patch actually grip. This ball-shaped pumice stone handles that step. Its porous stone structure strips the butyl layer faster than sandpaper or a flat wheel, and leaves the surface ready for a patch or plug. The stone sits on a 6 mm metal shank, ready to go straight into a drill or grinder chuck.
What it's used for
Surface prep eats up more of a tire repair job than the actual patching does — stripping the butyl layer and evening out the rubber takes real time. The ball shape reaches into recesses and edges a flat wheel would miss, and the pumice's porous surface removes rubber residue instead of just polishing over it. In practice, that means a shorter repair and less time spent with a file or sandpaper.
Build and materials
Pumice-type material, structured for rubber work.
Reaches recesses and edges flat wheels can't cover.
6 mm diameter, ready for chuck mounting.
Runs up to 7000 RPM.
Specifications
| Parameter | Value |
|---|---|
| Part number | 14-340KL |
| Product type | Ball-shaped pumice stone with shank |
| Stone diameter | 40 mm |
| Shank diameter | 6 mm |
| Max. speed | Up to 7000 RPM |
| Sold as | 1 piece |
Where it's used
- Roughening rubber before a repair patch goes on
- Stripping the butyl layer during surface prep
- Running in a drill or grinder chuck
- Cutting down the time needed for surface prep
- Daily use in tire repair shops
Frequently asked questions
Why roughen the rubber before repairing it?
A smooth surface doesn't hold cement or a repair patch well. Roughening the rubber improves grip, so the repair doesn't come loose after a short time on the road.
How is this different from a regular grinding wheel?
The ball shape reaches recesses and edges a flat wheel can't cover evenly. The pumice's porous structure strips the butyl layer more effectively than smoother abrasive materials.
What speed is safe for this stone?
Up to 7000 RPM. Check your drive tool before you start.
What chuck size does the shank fit?
The shank is 6 mm in diameter and fits standard drill chucks and grinder chucks.