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Grit Table / waterstones / Shapton Glass HR

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Shapton Glass HR

Waterstone line, 10 grades, 220 to 30000

The number on the stone is Shapton's own, not a JIS grade. Shapton's printed micron tracks a fixed ratio, close to 14700 divided by the grit number, and appears on each stone as a single figure. Placed on the JIS R6001 ladder, every grade lands about half a grade to a full grade coarser than the JIS grade of the same number, and the two finest fall past the end of the standard.

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 sizemicrons, log
5020105210.5
coarserfiner
inkmeasured or standardmaker figureour estimate
shapeknown distributionpoint, spread unknown
#220Maker-published
Shapton
66.82 µm

Coarser than the coarsest JIS grade (#240, 57 µm).

spread not published · reference scale about #210

#500Maker-published
Shapton
29.4 µm
JIS #500
25 µm

Sits between JIS #400 (30 µm) and #500 (25 µm), nearer #400.

spread not published · reference scale about #410

#1000Maker-published
Shapton
14.7 µm
JIS #1000
11.5 µm

Sits between JIS #700 (17 µm) and #800 (14 µm), nearer #800.

spread not published · reference scale about #770

#2000Maker-published
Shapton
7.35 µm
JIS #2000
6.7 µm

Sits between JIS #1500 (8 µm) and #2000 (6.7 µm), nearer #1500.

spread not published · reference scale about #1700

#3000Maker-published
Shapton
4.9 µm
JIS #3000
4 µm

Sits between JIS #2000 (6.7 µm) and #3000 (4 µm), nearer #3000.

spread not published · reference scale about #2550

#4000Maker-published
Shapton
3.68 µm
JIS #4000
3 µm

Sits between JIS #3000 (4 µm) and #4000 (3 µm), nearer #3000.

spread not published · reference scale about #3250

#6000Maker-published
Shapton
2.45 µm
JIS #6000
2 µm

Sits between JIS #4000 (3 µm) and #6000 (2 µm), nearer #4000.

spread not published · reference scale about #4900

#8000Maker-published
Shapton
1.84 µm
JIS #8000
1.2 µm

Sits between JIS #6000 (2 µm) and #8000 (1.2 µm), nearer #6000.

spread not published · reference scale about #6300

#16000Maker-published
Shapton
0.92 µm

Beyond the JIS range. JIS R6001 stops at #8000 (1.2 µm).

spread not published · reference scale about #9300

#30000Maker-published
Shapton
0.49 µm

Beyond the JIS range. JIS R6001 stops at #8000 (1.2 µm).

spread not published · reference scale about #13200