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Major Diameter Tolerances External Threads Table and Calculator

ANSI Hardware Design Guide and Charts
Tolerances, Engineering Design & Limits & Fits

Major Diameter Tolerances for External Threads of Special Diameters (UNS/UNRS) - Classes 1A, 2A, and 3A Formula, Table and Calculator Per. ASME B1.1

The Major Diameter Tolerance may be calculated by

Class 1A
Eq. 1
Tolerance = 0.090 · P2/3

Class 2A and 3A
Eq. 2
Tolerance = 0.060 · P2/3

P = 1 / p

Where

p = Pitch, number of threads per inch

Threads/ in.
Major Diameter Tolerance
All data given in inches
Class 1A
Class2A
and
Class3A
80
...
0.0032
72
...
0.0035
64
...
0.0038
56
...
0.0041
48
...
0.0045
44
...
0.0048
40
0.0077
0.0051
36
0.0083
0.0055
32
0.0089
0.0060
28
0.0098
0.0065
27
0.0100
0.0067
24
0.0108
0.0072
20
0.0122
0.0081
18
0.0131
0.0087
16
0.0142
0.0094
14
0.0155
0.0103
12
0.0172
0.0114
10
0.0194
0.0129
8
0.0225
0.0150
6
0.0273
0.0182
4
0.0357
0.0238

 

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