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Grit Table / wheels / Tormek Grinding wheel
Product, no maker data
Tormek Grinding wheel
Grinding wheel
No particle size in microns is published for this line. The values are our estimates from secondary sources, so the marks are faded and the spread is unknown.
Each grade below shows its size in microns, its spread (the published distribution, where a maker or standard gives one; most makers publish none), and where that size lands on the reference scale , a shared yardstick for reading grit numbers across makers.
Particle size microns, log
50 30 20 10 5 3
coarser finer
ink
shape
220 to 1000 (graded, SP-650) Our estimate
Range 11.5 to 60 µm. Aluminium oxide.
spread 11.5 to 60 µm · reference scale about #350
220 to 1000 (graded, SP-650) Our estimate
Range 11.5 to 60 µm. Silicon carbide, runs cooler on HSS / high-alloy, favoured by turners.
spread 11.5 to 60 µm · reference scale about #350
4000 Our estimate
Finest Tormek wheel, finishing pass before strop.
spread not published · reference scale about #4000
360 (Diamond Coarse) Our estimate
Constant-diameter diamond wheel.
spread not published · reference scale about #320
600 (Diamond Fine) Our estimate
~25 micron estimated from 600 grit.
spread not published · reference scale about #480
1200 (Diamond Extra Fine) Our estimate
~12 micron estimated from 1200 grit.
spread not published · reference scale about #950
Sources Tormek SG-250 Original; 'equivalent to 220 (coarse) to 1000 (fine) grit' via SP-650 grader, no micron published (C-estimated) Tormek SB-250 Blackstone Silicon; same 220-1000 graded range, no micron published (C-estimated) Tormek SJ-250 Japanese waterstone, 'equivalent to 4000 grit', no micron published (C-estimated) Tormek DC-250 Diamond Coarse, grit 360 only on spec block, no micron published (C-estimated) Tormek DF-250 Diamond Fine, grit 600 only, no micron published (C-estimated) Tormek DE-250 Diamond Extra Fine, grit 1200 only, no micron published (C-estimated)