The AQL tables are a fundamental tool used by the vast majority of quality inspectors in Asia. Here are the tables that our technicians use, unless our clients ask for another sampling plan. (Source: ISO 2859-1 standard)
I. Sample size code letter
| Lot size (pcs) |
General inspection levels |
Special inspection levels |
| I |
II |
III |
S1 |
S2 |
S3 |
S4 |
| 2 to 8 |
A |
A |
B |
A |
A |
A |
A |
| 9 to 15 |
A |
B |
C |
A |
A |
A |
A |
| 16 to 25 |
B |
C |
D |
A |
A |
B |
B |
| 26 to 50 |
C |
D |
E |
A |
B |
B |
C |
| 51 to 90 |
C |
E |
F |
B |
B |
C |
C |
| 91 to 150 |
D |
F |
G |
B |
B |
C |
D |
| 151 to 280 |
E |
G |
H |
B |
C |
D |
E |
| 281 to 500 |
F |
H |
J |
B |
C |
D |
E |
| 501 to 1,200 |
G |
J |
K |
C |
C |
E |
F |
| 1,201 to 3,200 |
H |
K |
L |
C |
D |
E |
G |
| 3,201 to 10,000 |
J |
L |
M |
C |
D |
F |
G |
| 10,001 to 35,000 |
K |
M |
N |
C |
D |
F |
H |
| 35,001 to 150,000 |
L |
N |
P |
D |
E |
G |
J |
| 150,001 to 500,000 |
M |
P |
Q |
D |
E |
G |
J |
| 500,001 and over |
N |
Q |
R |
D |
E |
H |
K |
II. Single sampling plans for a normal inspection
Sample size
code letter |
Sample size
to check (pcs) |
Acceptable Quality Limits (AQL) for normal inspections |
| 0.065 |
0.10 |
0.15 |
0.25 |
0.40 |
0.65 |
1.0 |
1.5 |
2.5 |
4.0 |
6.5 |
| Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
Ac |
Re |
| A |
2 |
|
|
|
|
|
|
|
|
|
|
0 |
1 |
| B |
3 |
|
|
|
|
|
|
|
|
|
0 |
1 |
|
| C |
5 |
|
|
|
|
|
|
|
|
0 |
1 |
|
|
| D |
8 |
|
|
|
|
|
|
|
0 |
1 |
|
|
1 |
2 |
| E |
13 |
|
|
|
|
|
|
0 |
1 |
|
|
1 |
2 |
2 |
3 |
| F |
20 |
|
|
|
|
|
0 |
1 |
|
|
1 |
2 |
2 |
3 |
3 |
4 |
| G |
32 |
|
|
|
|
0 |
1 |
|
|
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
| H |
50 |
|
|
|
0 |
1 |
|
|
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
| J |
80 |
|
|
0 |
1 |
|
|
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
| K |
125 |
|
0 |
1 |
|
|
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
14 |
15 |
| L |
200 |
0 |
1 |
|
|
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
14 |
15 |
21 |
22 |
| M |
315 |
|
|
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
14 |
15 |
21 |
22 |
|
| N |
500 |
|
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
14 |
15 |
21 |
22 |
|
|
| P |
800 |
1 |
2 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
14 |
15 |
21 |
22 |
|
|
|
| Q |
1250 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
14 |
15 |
21 |
22 |
|
|
|
|
| R |
2000 |
3 |
4 |
5 |
6 |
7 |
8 |
10 |
11 |
14 |
15 |
21 |
22 |
|
|
|
|
|
