Inland Lapidary

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Flat Lap Machines
Flat Lap Machines for Cabbing and Polishing
Flat Lap Disks
Quality Diamond Disks for Flat Lap Machines
3M Micropolishing Films
Soft Diamond Laps for Cabbing
Lapidary Saws
Diamond Trim Saws and Band Saws
Saw Blades
For Band Saws and Trim Saws
Shaper / Grinder
Drum Grinder for Lapidary
Diamond Drums
Replacement Drums for Shaper / Grinder
Tools & Supplies
Accessories for Lapidary Equipment
Plated Diamond Wheels
Quality Plated Wheels for Cabbing Machines
Sintered Diamond Wheels
Professional Grade Wheels for Cabbing Machines
Sintered Diamond Laps
Professional Grade Laps for Faceting Machines
Sintered Carving Burs
Professional Grade Burs for Carving
Wire Drills and Carving Points
Diamond carving point sets and fine diameter drills
Plated Core Drills
Economy Hole Saws
Brazed Core Drills
Professional Grade Hole Saws
Estwing Picks & Pans
Estwing Geological Tools
Jewelry Boxes
Lacquer boxes for intarsia and other projects
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If you are looking for the diamond tools and equipment that Inland Craft makes for the stained glass hobby, click on the logo below.
 

site last updated:

December 03, 2008
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Diamond Grit Size Designations,  Approximate Particle Sizes, and Counts

The diamond grit designations for diamond lapidary tools actually represent a range of diamond particle sizes used to manufacture that designation. For example a 150 grit diamond wheel is actually a 140/170 grit wheel made up of diamond crystals ranging in size from 105-88 microns or .004-.0036 inches in diameter.

Inland lists grit size for all their diamond products by the standard US convention of labeling after the larger size diamond. For example, an Inland 60 grit diamond wheel is made from diamond grit size 60/ 80 range. If you are used to seeing a single number grit size, all you need to do is find the range which that grit falls into and then use the lower number of that range for the comparable Inland diamond product.
USA Grit
Size (mesh)		 Inland
Equivalent		 Size - Microns
(range or average mean)		 Size - Inches
(range or average)		 Number Particles in One Carat (approx) Comparable 
to these Grits
mesh is the number of wires per inch in a screen mesh listed grit on Inland diamond products 1 micron =
3.93700787 × 10-05 inches		 1 inch =
25, 400 microns		 1 carat = 0.2 grams
1 gram = 5 carats		 commonly found grit sizes in lapidary wheels & drums
8/10   2380-2000 .093-.075 4.2-7        
10/12   2000-1680 .075-.066 7-12  
12/14   1680-1410 .066-.055 12-20  
14/16   1410-1190 .055-.047 20-33  
16/18   1190-1000 .047-.039 33-57  
18/20   1000-840 .039-.033 57-97  
20/25   840-710 .033-.028 97-160  
25/30   710-590 .028-.023 160-282  
30/35  30 grit 590-500 .023-.019 282-460 30 G

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35/40   500-420 .019-.016 460-770  
40/45   420-350 .016-.014 770-1,334  
45/50   350-297 .014-.012 1,334-2,080  
50/60   297-250 .012-.010 2,080-3,240  
60/80 60 grit 250-177 .010-.007 3,240-10,400 60
80/100 80 grit 177-149 .007-.006 10,400-17-140 80
100/120 100 grit 149-125 .006-.005 17,140-20,920 100
120/140 120 grit 125-105 .005-.004 20,920-49,400  
140/170 140 grit 105-88 .004-.0035 49,400-82,400   
170/200 170 grit 88-74 .0035-.0029 82,400-140,000 180
200/230 200 grit 74-62 .0029-.0024 140,000-252,000 220
230/270   62-53 .0024-.0021 252,000-384,000 260
270/325  270 grit 53-45 .0021-.0018 384,000-660,000 275
325/400  325 grit 45-37 .0018-.0015 660,000-1,120,000 360
400/500   37-35 .0015-.0014 1,120,000-1,192,800   L

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500/600   35-30 .0014-.0012 1,192,800-2,046,000  
600/700 600 grit 30-29 .0012-.0011 ~2,046,000-2,418,850 600
700/800   29-25 .0011-.0010 ~2,418,850-9,503,000  
900 18.5 .00073 ~1.18•106
1000 16.5 .00065 ~1.32•107
1100 14.5 .00057 ~1.32•107
1200 1200 grit 18-12 .00071-.00047 ~1.696•107 1200
1400 10.5 .00041 ~1.696•107  
1500 9.5 .00037 ~1.39 •108
1800   12-8 .00047-.00031 ~1.696•107 - 2.62•108   P

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2200   10-6 .00039-.00024 ~7.86•107  
3000 3000 grit 8-4 .00031-.00016 ~2.62•108 3000
5000 4.5 .00018 ~8.82•108
6000 6-2 .00024-.00008 ~8.82•108  
8000   4-2 .00016-.00008 ~2.05•109  
12000   3-1 .00012-.00004 ~2.05•109 - 6.2•1010  
13000 1.25 .00005 ~ 6.2•1010
14000 1.0 .00004 6.2•1010
15000   2-0 .00008-0 average of 6.2•1010  
25000 1-0 .00004-0 6.2•1010 - 0
28000 0.5 .00002 ~ 3.1•1010
60000   1-.25 4•10-5-9.84•0-6 ~ 6.2•1010