TAP THREAD LIMIT STANDARDS AND DIMENSIONS  

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Table 331 - Special Taps

A B
C D
Threads Per Inch

To 5/8” Incl. Over 5/8" to 2 1/2” Incl. Over 2 1/2” To 1” Incl. Over 1” to 1 1/2” Incl. Over 1 1/2” to 2 1/2” Incl. Over 2 1/2 (Inches)
80
56
48
44
40
.0015
.0015
.0020
.0020
.0025
.0010
.0010
.0010
.0010
.0010
.0005
.0005
.0005
.0005
.0005
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0015
.0005
.0005
.0005
.0005
.0005
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0015
36
32
28
24
20
.0025
.0030
.0035
.0040
.0050
.0010
.0010
.0010
.0010
.0010
.0005
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0015
.0005
.0005
.0005
.0005
.0005
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0015
.0015
.0015
18
16
14
13
12
.0055
.0060
.0070
.0075
.0075
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0015
.0015
.0015
.0015
.0005
.0005
.0005
.0005
.0005
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0015
.0015
.0020
.0020
.0020
.0020
11
10
9
8
7
.0080
.0090
.0100
.0110
.0120
.0010
.0015
.0015
.0015
.0020
.0010
–
–
–
–
.0015
.0015
.0015
.0015
.0015
.0020
.0020
.0020
.0020
.0020
.0005
.0005
.0005
.0005
.0010
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0020
.0020
.0020
.0020
.0020
.0025
6
5
5 1/2
4
4 1/2
.0140
.0160
.0160
.0190
.0170
.0020
.0025
.0025
.0025
.0025
–
–
–
–
–
.0015
.0015
.0015
.0015
.0015
.0020
.0020
.0020
.0020
.0020
.0010
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0020
.0020
.0020
.0020
.0020
.0025
.0025
.0025
.0025
.0025


Table 341 - Metric ISO
P
Pitch
W X Y Z
mm Dec. Equiv. (Inches) (Inches) M1.6 to M6.3 Incl. (Inches) Over M6.3 to M25 Incl. (Inches) Over M25 to M90 Incl. (Inches) Over M90 (Inches) M1.6 to M6.3 Incl. (Inches) Over M6.3 to M25 Incl. (Inches) Over M25 to M90 Incl. (Inches) Over M90 (Inches)
0.3
0.35
0.4
0.45
0.5
.01181
.01378
.01575
.01772
.01968
.0009
.0011
.0013
.0014
.0016
.0010
.0010
.0010
.0010
.0010
.0015
.0015
.0015
.0015
.0015
.0015
.0015
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0025
.0006
.0006
.0006
.0006
.0006
.0006
.0006
.0006
.0008
.0008
.0008
.0008
.0008
.0008
.0010
.0008
.0008
.0010
.0010
.0010
0.6
0.7
0.75
0.8
0.9
.02362
.02756
.02953
.03150
.03543
.0019
.0022
.0024
.0025
.0028
.0010
.0016
.0016
.0016
.0016
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0025
.0025
.0025
.0025
.0025
.0025
.0025
.0025
.0025
.0025
.0030
.0030
.0030
.0008
.0008
.0008
.0008
.0008
.0008
.0008
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0010
.0012
.0012
.0012
1
1.25
1.5
1.75
2
.03937
.04921
.05906
.06890
.07874
.0032
.0039
.0047
.0055
.0063
.0016
.0025
.0025
.0025
.0025
.0025
.0025
.0025
–
–
.0025
.0025
.0030
.0030
.0035
.0030
.0030
.0030
.0035
.0035
.0030
.0035
.0035
.0040
.0040
.0010
.0010
.0010
–
–
.0010
.0012
.0012
.0012
.0016
.0012
.0012
.0012
.0016
.0016
.0012
.0016
.0016
.0016
.0016
2.5
3
3.5
4
4.5
.09843
.11811
.13780
.15748
.17717
.0079
.0095
.0110
.0126
.0142
.0025
.0039
.0039
.0039
.0039
–
–
–
–
–
.0035
.0040
.0040
.0040
–
.0040
.0040
.0045
.0045
.0050
.0045
.0050
.0050
.0055
.0055
–
–
–
–
–
.0016
.0016
.0016
.0020
.0020
.0016
.0020
.0020
.0020
.0020
.0020
.0020
.0020
.0025
.0025
5
5.5
6
.19685
.21654
.23622
.0158
.0173
.0189
.0039
.0039
.0039
–
–
–
–
–
–
.0050
.0055
.0055
.0060
.0060
.0060
–
–
–
–
–
–
.0025
.0025
.0025
.0025
.0025
.0025





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