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AMERICAN NATIONAL and UNIFIED FORM THREADS

W - Y Tolerance

Class W Tolerance For "GO" and "NOT GO" Thread Gages
TPI
LEAD
HALF ANGLE
+
-
MAJOR and MINOR DIAMETERS
PITCH DIAMETER
TOTAL CUMULATIVE TOLERANCE

To & Inc. 1⁄2" Dia.
Above 1⁄2" Dia.
To & Inc. 1⁄2" Dia.
Above 1⁄2" to 4"
Above 4" Diam.
To & Inc. 1⁄2" Dia.
Above 1⁄2" to 11⁄2"
Above 11⁄2" to 4"
Above 4" to 8"
To & Inc. 1⁄2" Dia.
Above 1⁄2" to 11⁄2"
Above 11⁄2" to 4"
Above 4" to 8"
80
.0001
.00015
20 min.
.0003
.0003
--
.0001
.00015
--
--
.00038
.00052
--
--
72
.0001
.00015
20 min.
.0003
.0003
--
.0001
.00015
--
--
.00039
.00053
--
--
64
.0001
.00015
20 min.
.0003
.0004
--
.0001
.00015
--
--
.00041
.00055
--
--
56
.0001
.00015
20 min.
.0003
.0004
--
.0001
.00015
.0002
--
.00043
.00057
.00062
--
48
.0001
.00015
18 min.
.0003
.0004
--
.0001
.00015
.0002
--
.00044
.00057
.00062
--

44
.0001
.00015
15 min.
.0003
.0004
--
.0001
.00015
.0002
--
.00042
.00056
.00061
--
40
.0001
.00015
15 min.
.0003
.0004
--
.0001
.00015
.0002
--
.00044
.00057
.00062
--
36
.0001
.00015
12 min.
.0003
.0004
--
.0001
.00015
.0002
--
.00042
.00056
.00061
--
32
.0001
.00015
12 min.
.0003
.0005
.0007
.0001
.00015
.0002
.00025
.00044
.00057
.00062
.00067
28
.00015
.00015
8 min.
.0005
.0005
.0007
.0001
.00015
.0002
.00025
.00048
.00053
.00058
.00063

24
.00015
.00015
8 min.
.0005
.0005
.0007
.0001
.00015
.0002
.00025
.00051
.00056
.00061
.00066
20
.00015
.00015
8 min.
.0005
.0005
.0007
.0001
.00015
.0002
.00025
.00053
.00058
.00063
.00068
18
.00015
.00015
8 min.
.0005
.0005
.0007
.0001
.00015
.0002
.00025
.00055
.00060
.00065
.00070
16
.00015
.00015
8 min.
.0006
.0006
.0009
.0001
.0002
.00025
.0003
.00058
.00068
.00073
.00078

14
.0002
.0002
6 min.
.0006
.0006
.0009
.00015
.0002
.00025
.0003
.00068
.00073
.00078
.00083
13
.0002
.0002
6 min.
.0006
.0006
.0009
.00015
.0002
.00025
.0003
.00070
.00075
.00080
.00085
12
.0002
.0002
6 min.
.0006
.0006
.0009
.00015
.0002
.00025
.0003
.00071
.00076
.00081
.00086
11
.0002
.0002
6 min.
.0006
.0006
.0009
.00015
.0002
.00025
.0003
.00073
.00078
.00083
.00088

10
--
.00025
6 min.
--
.0006
.0009
--
.0002
.00025
.0003
--
.00089
.00094
.00099
9
--
.00025
6 min.
--
.0007
.0011
--
.0002
.00025
.0003
--
.00092
.00097
.00102
8
--
.00025
5 min.
--
.0007
.0011
--
.0002
.00025
.0003
--
.00091
.00096
.00101
7
--
.0003
5 min.
--
.0007
.0011
--
.0002
.00025
.0003
--
.00103
.00108
.00113

6
--
.0003
5 min.
--
.0008
.0013
--
.0002
.00025
.0003
--
.00108
.00113
.00118
5
--
.0003
4 min.
--
.0008
.0013
--
--
.00025
.0003
--
--
.00112
.00117
4 1/2
--
.0003
4 min.
--
.0008
.0013
--
--
.00025
.0003
--
--
.00116
.00121
4
--
.0003
4 min.
--
.0009
.0015
--
--
.00025
.0003
--
--
.00121
.00126

Class Y Tolerance For "GO" Thread Gages

TPI
LEAD
HALF ANGLE
MAJOR or MINOR DIAMETERS
PITCH DIAMETERS
+
-
+
-
To and Incl. 4"
Above 4" Diam.
To and Including
Above 11⁄2 To 4 Incl.
Above 4" to 8" Inc.
From
To
From
To
From
To
80
.0002
45 min.
.0003
--
.0001
.0003
--
--
--
--
72
.0002
45 min.
.0003
--
.0001
.0003
--
--
--
--
64
.0002
45 min.
.0004
--
.0001
.0004
--
--
--
--
56
.0002
45 min.
.0004
--
.0001
.0006
.0001
.0006
--
--

48
.0002
45 min.
.0004
--
.0001
.0004
.0001
.0006
--
--
44
.0002
30 min.
.0004
--
.0001
.0004
.0001
.0006
--
--
40
.0002
30 min.
.0004
--
.0001
.0004
.0001
.0006
--
--
36
.0002
30 min.
.0004
--
.0001
.0004
.0001
.0006
--
--

32
.0003
20 min.
.0005
.0007
.0001
.0004
.0001
.0006
.0001
.0008
28
.0003
20 min.
.0005
.0007
.0002
.0005
.0002
.0007
.0002
.0009
24
.0003
20 min.
.0005
.0007
.0002
.0005
.0002
.0007
.0002
.0009
20
.0003
20 min.
.0005
.0007
.0002
.0005
.0002
.0007
.0002
.0009

18
.0003
15 min.
.0005
.0007
.0002
.0005
.0002
.0007
.0002
.0009
16
.0003
15 min.
.0006
.0009
.0002
.0006
.0002
.0008
.0002
.0010
14
.0003
15 min.
.0006
.0009
.0002
.0006
.0002
.0008
.0002
.0010
13
.0003
15 min.
.0006
.0009
.0002
.0006
.0002
.0008
.0002
.0010

12
.0003
10 min.
.0006
.0009
.0002
.0006
.0002
.0008
.0002
.0010
11
.0003
10 min.
.0006
.0009
.0002
.0006
.0002
.0008
.0002
.0010
10
.0003
10 min.
.0006
.0009
.0002
.0006
.0002
.0008
.0002
.0010
9
.0003
10 min.
.0007
.0011
.0002
.0007
.0002
.0009
.0002
.0011

8
.0004
5 min.
.0007
.0011
.0002
.0007
.0002
.0009
.0002
.0011
7
.0004
5 min.
.0007
.0011
.0002
.0007
.0002
.0009
.0002
.0011
6
.0004
5 min.
.0008
.0013
.0003
.0008
.0003
.0010
.0003
.0012
5
.0004
5 min.
.0008
.0013
--
--
.0003
.0010
.0003
.0012

4 1/2
.0004
5 min.
.0008
.0013
--
--
.0003
.0010
.0003
.0012
4
.0004
5 min.
.0009
.0015
--
--
.0003
.0011
.0003
.0013

RETURN TO TOLERANCE CHART INDEX