AQL Tables

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
285 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