If you want more control over how your Tormek grindstone behaves, the SP-650 Stone Grader is the tool that makes it possible. With one stone you can switch between fast steel removal and fine sharpening—no wheel changes, no angle adjustments, just a quick grading pass. The coarse side reopens the stone for heavier cuts, while the fine side smooths the surface for cleaner, lighter sharpening.

This lets you shape, refine, and finish on the same wheel with predictable results. It also keeps your stone cutting efficiently over time, especially if you use your grinder frequently. For anyone sharpening a variety of tools, the SP-650 is one of the simplest ways to keep your workflow steady and your edges consistent.

• 220–1000 grit control: Grades the stone surface for coarse shaping or fine sharpening without swapping wheels.
• Works on multiple stones: Compatible with SG-250/SG-200 Original Grindstones and the SB-250 Blackstone Silicon.
• Fine-side cleaning: Safely cleans SJ-250/SJ-200 Japanese Waterstones using the fine face only.
• Easy operation: Just press the grader against the spinning wheel—sound and feel tell you when the surface changes.
• Restores efficiency: Coarse side rejuvenates a glazed or worn stone for faster cutting.