1. LETRA CODIGO ANSI-ASQ-Z1.9-2008 (2)

01.Z1.9(001-104).qxd
2/17/09
2:40 PM
Page 6
ANSI/ASQ Z1.9-2008
Table A-21
Sample Size Code Letters2
Lot Size
2
9
16
26
51
91
151
281
401
501
1,201
3,201
10,001
35,001
150,001
500,001
to
8
to
15
to
25
to
50
to
90
to
150
to
280
to
400
to
500
to
1,200
to
3,200
to
10,000
to
35,000
to 150,000
to 500,000
and
over
Inspection Levels
Special General
S3 S4 I II III
B
B
B
B
B
B
B
C
C
D
E
F
G
H
H
H
B
B
B
B
B
C
D
E
E
F
G
H
I
J
K
K
B
B
B
C
D
E
F
G
G
H
I
J
K
L
M
N
B
B
C
D
E
F
G
H
I
J
K
L
M
N
P
P
C
D
E
F
G
H
I
J
J
K
L
M
N
P
P
P
1
The theory governing inspection by variables depends on
the properties of the normal distribution and, therefore,
this method of inspection is only applicable when there is
reason to believe that the frequency distribution is normal.
2
Sample size code letters given in body of table are applicable when the indicated inspection levels are to be used.
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