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Table I - Sample Size Code Letters
(source ANSI/ASQC Z1.4-1993)
Lot or Batch Size
Special Inspection Levels
General Inspection Levels
S-1
S-2
S-3
S-4
I
II
III
2 to 8 A A A A A A A
9 to 15 A A A A A A A
16 to 25 A A A B B C D
26 to 50 A B C B C D E
51 to 90 B B C C C E F
91 to 150 B B D C D F G
151 to 280 B C E D E G H
281 to 500 B C E D F H J
501 to 1,200 C C F E G J K
1,201 to 3,200 C D G E H K L
3,201 to 10,000 C D G F J L M
10,001 to 35,000 C D H F K M N
35,001 to 150,000 D E J G L N P
150,001 to 500,000 D E J G M P Q
500,001 and over D E K H N Q R


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