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TM 9-254
4-28. Thread Limits - Continued
Table 4-10. Thread Limits, Type I, Series A Through C, Cut Thread Taps - Continued
Screw Gage
Number or
Threads Per Inch
Major Diameter Limits
Pitch Diameter Limits
Diameter
Series
Series
Series
A
B
C
Basic
Min.
Max.
Basic
Min.
Max.
Inches
.............
.............
............
Inch
Inch
Inch
Inch
Inch
Inch
14...........
.............
.............
24
.2420
.2448
.2473
.2149
.2154
.2174
1/16........
.............
.............
64
.0625
.0635
.0650
.0524
.0526
.0536
3/32........
.............
.............
48
.0938
.0951
.0966
.0803
.0805
.0815
1/8..........
.............
.............
40
.1250
.1266
.1286
.1088
.1090
.1105
5/32........
.............
.............
32
.1563
.1585
.1605
.1360
.1365
.1380
5/32........
.............
.............
36
.1563
.1580
.1600
.1382
.1384
.1399
3/16........
.............
.............
24
.1875
.1903
.1923
.1604
.1609
.1624
3/16........
.............
.............
32
.1875
.1897
.1917
.1672
.1677
.1692
7/32........
.............
.............
24
.2188
.2216
.2236
.1917
.1922
.1937
7/32........
.............
.............
32
.2188
.2210
.2230
.1985
.1990
.2005
1/4..........
20
.............
............
.2500
.2532
.2557
.2175
.2180
.2200
1/4..........
.............
.............
24
.2500
.2528
.2553
.2229
.2234
.2254
1/4..........
.............
28
............
.2500
.2524
.2549
.2268
.2273
.2288
1/4..........
.............
.............
32
.2500
.2522
.2547
.2297
.2302
.2317
5/16........
18
.............
............
.3125
.3160
.3185
.2764
.2769
.2789
5/16........
.............
24
............
.3125
.3153
3178
.2854
.2859
.2874
5/16........
.............
.............
32
.3125
.3147
.3172
.2922
.2927
.2942
3/8..........
16
.............
............
.3750
.3789
.3814
.3344
.3349
.3369
3/8..........
.............
24
............
.3750
.3778
.3803
.3479
.3484
.3499
7/16........
14
.............
............
.4375
.4419
.4449
.3911
.3916
.3941
7/16........
.............
20
............
.4375
.4407
.4437
.4050
.4055
.4075
1/2..........
13
.............
............
.5000
.5047
.5077
.4500
.4505
.4530
1/2..........
.............
20
............
.5000
.5032
.5062
.4675
.4680
.4700
9/16........
12
.............
............
.5625
.5675
.5705
.5084
.5089
.5114
9/16........
.............
18
............
.5625
.5660
.5690
.5264
.5269
.5289
5/8..........
11
.............
............
.6250
.6304
.6334
.5660
.5665
.5690
5/8..........
.............
.............
12
.6250
.6300
.6330
.5709
.5714
.5739
5/8..........
.............
18
............
.6250
.6285
.6315
.5889
.5894
.5914
11/16 ......
.............
.............
11
.6875
.6929
.6969
.6285
.6290
.6320
11/16 ......
.............
.............
16
.6875
.6914
.6954
.6469
.6474
.6499
3/4 .........
10
.............
............
.7500
.7559
.7599
.6850
.6855
.6885
3/4 .........
.............
16
............
.7500
.7539
.7579
.7094
.7099
.7124
7/8 .........
9
.............
............
.8750
.8820
.8860
.8028
.8038
.8068
7/8 .........
.............
14
............
.8750
.8799
.8839
.8286
.8296
.8321
1 ............
8
.............
............
1.0000
1.0078
1.0118
.9188
.9198
.9228
1 ............
.............
12
............
1.0000
1.0055
1.0095
.9459
.9469
.9499
1 ............
.............
.............
14
1.0000
1.0049
1.0089
.9536
.9546
.9571
1-1/8 ......
7
.............
............
1.1250
1.1337
1.1382
1.0322
1.0332
1.0367
1-1/8.......
.............
12
............
1.1250
1.1305
1.1350
1.0709
1.0719
1.0749
1-1/4.......
7
.............
............
1.2500
1.2587
1.2632
1.1572
1.1582
1.1617
1-1/4.......
.............
12
............
1.2500
1.2555
1.2600
1.1959
1.1969
1.1999
1-3/8.......
6
.............
............
1.3750
1.3850
1.3895
1.2667
1.2677
1.2712
1-3/8 ......
.............
12
............
1.3750
1.3805
1.3850
1.3209
1.3219
1.3249
1-1/2.......
6
.............
............
1.5000
1.5100
1.5145
1.3917
1.3927
1.3962
1-1/2.......
.............
12
............
1.5000
1.5055
1.5100
1.4459
1.4469
1.4499
1-3/4.......
5
.............
............
1.7500
1.7602
1.7657
1.6201
1.6216
1.6256
2
4-1/2
.............
............
2.0000
2.0111
2.0166
1.8557
1.8572
1.8612
Change 6 4-63
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