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Stones And Abrasive Grades - Autonopedia

NOTES: It is impossible to make exact comparisons between all the different abrasives because different standards are used for minimum and maximum size, the percentage allowed outside those limits, and the distribution of sizes within those limits.

Sizes of 220 grit (60 micron) and larger (macrogrits) are determined by sieving, while sizes of 230 grit and smaller (microgrits) are determined by sedimentation.

European "P" sizes are for coated abrasives; "F" sizes are for bonded abrasives.

Relative grit sizes of belts, wheels, stones and hones used in knifemaking, sharpening and woodworking.
Description	Belts and wheels		Waterstones	Average grit size in microns
	CAMI (USA)	FEPA (Europe)	JIS (Japan)	Average grit size in microns
	12			1842
		P12		1764
*American National Standards Institute B74.12.	12*			1600
	16	P16		1322
	16*			1092
		P20		984
	20*			940
	20			905
	24*			686
		P24		740
	24			715
	30			638
		P30		622
	30*			559
	36			535
		P36		524
	40			428
		P40		412
	50			351
		P50		326
	60			268
		P60		260
		P80		195
	80			192
		P100		156
Coarse Crystolon	100		150	141
		P120		127
	120			116
100 micron belt				100
		P150		97
Medium Crystolon, coarse India	150			93
80 Micron belt				80
	180	P180		78
3M 74 micron diamond stone				74
		P220		65
60 Micron belt, extra coarse diamond hone	220			60
		P240	240	58
	240			53.5
Medium India, fine Crystolon		F230		53
		P280		52.5
			280	50
		P320		46
Coarse Diamond	325	F240		45
Fine India	280		320	43
		P360		40.5
3M 40 micron diamond stone & belt	"400"			40
		F280		36.5
Medium diamond	320		360	36
35 Micron belt		P400		35
			400	32
30 Micron belt		P500		30
Washita	360	F320		29
		P600		25.8
Fine Diamond	600			25
	400	F360		23
22 Micron belt			600	22
		P800		21.8
Soft Arkansas, 20 Micron belt				20
3M 20 micron stone	"800"			20
	500			19.5
18 Micron belt		P1000		18.3
		F400		17
	600		800	16
		P1200		15.3
15 Micron belt, 15 micron SiC paper				15
Hard white Arkansas, extra fine diamond, and medium ceramic	700		1000	14
		P1500		12.6
12 micron belt	800			12
			1200	11
Queer Creek Blue Ohio Sandstone	600 - 1000			9-16
		P2000		10.3
3M 10 micron diamond stone	"1800"			10
	1000	F600	1500	9.2
Extra-fine diamond hone	"1200"			9
Hard black Arkansas, 9 micron belt	1000			9
		P2500		8.4
			2000	7.5
	1200	F800		6.5
6 Micron belt				6
5 micron SiC paper		F1000		5
Extra fine white Ceramic, green chrome rouge, 3 Micron belt, Tormek compound*	1500	F1200	4000	3
		F1500	6000	2
Japanese Waterstone		F2000	8000	1.2
1 Micron belt, Linde C compound	2000			1
Chromium oxide polishing compound, 0.5 micron Chromium oxide paper				0.5
There is another chart of fine abrasive equivalents at http://www.gemsociety.org/info/chmesh.htm
Crystolon is Norton Abrasives tm for Silicon Carbide stones
India is Norton Abrasives tm for Aluminum Oxide stones
Raybrite and Linde compounds are aluminum oxide powders

* Tormek compound contains a variety of grains of various size, the smallest down to 0.7 micron. The average effective size is 3 micron.

Scotch-Brite Abrasive Belt Equivalent Grits

3M is not consistant in their use of colour for a particular grit. This chart is based on Scotch-Brite surface finishing belt data.

Grade	Equivalent abrasive grit	Color	Abrasive Material	Finish (micro-inches)
Grade	Equivalent abrasive grit	Color	Abrasive Material	Aluminum	Stainless Steel
Coarse	80 - 150	Brown	Aluminum Oxide	130 - 150	62 - 72
Medium	150 - 180	Maroon	Aluminum Oxide	80 - 100	32 - 40
Fine	180 - 220	Green?	Aluminum Oxide	50 - 70*	15 - 25*
Very fine	220 - 320	Blue	Aluminum Oxide	16 - 35	6 - 12
Super fine	320 - 600	Gray	Silicon Carbide	8 - 12	4 - 6
*Estimated. Scotch-Brite is a tm of 3M Corp.

Scotch-Brite Hand Pads
Grit Designation	Color	Equivalent Grit	Abrasive
Extra Coarse	Brown		Aluminum Oxide
Coarse	Tan		Aluminum Oxide
Medium	White, Gray or Maroon		Aluminum Oxide
Fine	Light Gray or Green	150 - 180	Aluminum Oxide
Very Fine	Maroon	220 - 280	Aluminum Oxide
Extra Fine	Gray	320 - 400	Silicon Carbide
Ultra Fine	White	600 - 800	Talc

BearTex (Norton) Hand Pads in Order of Agressiveness
Grit Designation	Color	Abrasive	Product code
Very Fine	Maroon	Aluminum Oxide	777
Very Fine	Maroon	Aluminum Oxide	747
Very Fine	Green	Aluminum Oxide	796
Very Fine	Gray	Silicon Carbide	851
Ultra Fine	Gray	Silicon Carbide	635
Micro Fine	Gray	Silicon Carbide	748
Non-abrasive	White	None	456

3M Trizact Abrasive grades (This abrasive is arranges in pyramids, and they claim 2 to 4 times longer life.)
(Average mineral size in microns)	FEPA P-grade equivalents
6	P2500
16	P1200
20
30
40
45	P400
60
65	P280
80
90	P220
100
110	P180
160	P120

Chart of Abrasive cutting rate vs. Sharpness
Copyright 1999,2000,2001,2002, 2003, 2004 Steve Bottorff
Distribute freely with proper credit.
Updated August 24, 2004

Autonopedia

Stones And Abrasive Grades - Autonopedia

Scotch-Brite Abrasive Belt Equivalent Grits

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