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Page Title:
Table 4-1. American Standard Thread Gage Tolerances |
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 TM 750-245-4
Table 4-1. American Standard Thread Gage Tolerances
Pitch diameter tolerances
Threads
W
X
Major or minor
Lead*
per
gages
gages
Y gages
diam. tolerances
tolerances
inch
From
To
W
X and Y
W
X and Y
80
....
.0002
.0001
.0003
....
.0003
....
.0002
72
....
.0002
.0001
.0003
....
.0003
....
.0002
64
....
.0002
.0001
.0003
....
.0003
....
.0002
56
....
.0002
.0001
.0004
....
.0004
....
.0002
48
....
.0002
.0001
.0004
....
.0004
....
.0002
44
....
.0002
.0001
.0004
....
.0004
....
.0002
40
....
.0002
.0001
.0004
....
.0004
....
.0002
36
....
.0002
.0001
.0004
....
.0004
....
.0002
32
....
.0003
.0001
.0004
....
.0004
....
.0003
28
.0001
.0003
.0002
.0005
.0005
.0005
.00015
.0003
24
.0001
.0003
.0002
.0005
.0005
.0005
.00015
.0003
20
.0001
.0003
.0002
.0005
.0005
.0005
.00015
.0003
18
.0001
.0003
.0002
.0005
.0005
.0005
.00015
.0003
16
.0001
.0003
.0002
.0006
.0006
.0006
.00015
.0003
14
.00015
.0003
.0002
.0006
.0006
.0006
.0002
.0003
13
.00015
.0003
.0002
.0006
.0006
.0006
.0002
.0003
12
.00015
.0003
.0002
.0006
.0006
.0006
.0002
.0003
11
.00015
.0003
.0002
.0006
.0006
.0006
.0002
.0003
10
.0002
.0003
.0002
.0006
.0006
.0006
.00025
.0003
9
.0002
.0003
.0002
.0007
.0007
.0007
.00025
.0003
8
.0002
.0004
.0002
.0007
.0007
.0007
.00025
.0004
7
.00025
.0004
.0002
.0007
.0007
.0007
.0003
.0004
6
.00025
.0004
.0003
.0008
.0008
.0008
.0003
.0004
5
.00025
.0004
.0003
.0008
.0008
.0008
.0003
.0004
4 1/2
.0003
.0004
.0003
.0008
.0008
.0008
.0003
.0004
4
.0003
.0004
.0003
.0009
.0009
.0009
.0003
.0004
*Allowable variation in lead between any two threads not farther apart than the standard length of engagement, which is
equal to the basic major diameter.
Table 4-2. Tolerances on Half Angle of Thread, Minutes
Threads
Threads
per
W
X
Y
per
W
X
Y
inch
gage
gage
gage
inch
gage
gage
gage
80
....
30'
45'
16
8'
10'
15'
72
....
30'
45'
14
6'
10'
15'
64
....
30'
45'
13
6'
10'
15'
56
....
30'
45'
12
6'
10'
10'
48
....
30'
45'
11
6'
10'
10'
44
....
20'
30'
10
5'
10'
10'
40
....
20'
30'
9
5'
10'
10'
36
....
20'
30'
8
5'
5'
5'
32
....
15'
20'
7
4'
5'
5'
28
8'
15'
20'
6
4'
5'
5'
24
8'
15'
20'
5
4'
5'
5'
20
8'
15'
15'
4 1/2
4'
5'
5'
18
8'
10'
15'
4
4'
5'
5'
4-2
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