Appendix
SAE AS 4059
Like ISO 4406, SAE describes AS 4059 particle concentrations in fluids. The
analysis methods can be applied in the same manner as ISO 4406:1999.
The SAE cleanliness classes are based on particle size, number and
distribution. The particle size determined depends on the measurement
process and calibration; consequently the particle sizes are labeled with
letters (A-F).
The following table shows the cleanliness classes in relation to the particle
concentration determined:
SAE AS 4059 table
Maximum particle count / 100 ml
Size ISO 4402
> 1 µm
> 5 µm
> 15 µm
> 25 µm
> 50 µm
> 100 µm
Size ISO 11171
> 4 µm
(c)
> 6 µm
(c)
> 14 µm
(c)
> 21 µm
(c)
> 38 µm
(c)
> 70 µm
(c)
Size code
A
B
C
D
E
F
C
lasses
000
195
76
14
3
1
0
00
390
152
27
5
1
0
0
780
304
54
10
2
0
1
1,560
609
109
20
4
1
2
3,120
1,220
217
39
7
1
3
6,250
2,430
432
76
13
2
4
12,500
4,860
864
152
26
4
5
25,000
9,730
1,730
306
53
8
6
50,000
19,500
3,460
612
106
16
7
100,000
38,900
6,920
1,220
212
32
8
200,000
77,900
13,900
2,450
424
64
9
400,000
156,000
27,700
4,900
848
128
10
800,000
311,000
55,400
9,800
1,700
256
11
1,600,000
623,000
111,000
19,600
3,390
512
12
3,200,000
1,250,000
222,000
39,200
6,780
1,020
Show cleanliness classes to SAE
Absolute particle count larger than a defined particle size
Example: Cleanliness class to AS 4059:6
The maximum permissible particle count in the individual size ranges is bold-
faced in the above table.
Cleanliness class to AS 4059:6B
Size B particles may not exceed the maximum number indicated for code 6
6 B = max. 19,500 particles > 5 µm in size
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