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TM 9-254
5-9.
Screw Thread - Continued
Table 5-11. Basic Coarse Thread Dimensions and Tap Drill Sizes - Continued
Commercial
Decimal
Nominal size
Outside
Pitch
Root
tap drill to
equivalent
diameter
diameter
diameter
produce approx
of tap
Inch Threads
(in.)
(in.)
(in.)
75 percent
drill
per inch
full thread
9/16-12
.5625
.5084
.4542
31/64
.4844
18
.5625
.5264
.4903
33/64
.5156
27
.5625
.5384
.5144
17/32
.5312
5/8-11
.6250
.5660
.5069
17/32
.5312
12
.6250
.5709
.5168
35/64
.5469
18
.6250
.5889
.5528
37/64
.5781
27
.6250
.6009
.5769
19/32
.5937
11/16-11
.6875
.6285
.5694
19/32
.5937
16
.6875
.6469
.6063
5/8
.6250
3/4-10
.7500
.6850
.6201
21/32
.6562
12
.7500
.6959
.6418
43/64
.6719
16
.7500
.7094
.6688
11/16
.6875
27
.7500
.7259
.7019
23/32
.7187
13/16-10
.8125
.7476
.6826
23/32
.7187
7/8-9
.8750
.8029
.7307
49/64
.7656
12
.8750
.8209
.7668
51/64
.7969
14
.8750
.8286
.7822
13/16
.8125
18
.8750
.8389
.8028
53/64
.8281
27
.8750
.8509
.8269
27/32
.8437
15/16-9
.9375
.8654
.7932
53/64
.8281
1-8
1.0000
.9188
.8376
7/8
.8750
12
1.0000
.9459
.8918
59/64
.9219
14
1.0000
.9536
.9072
15/16
.9375
27
1.0000
.9759
.9519
31/32
.9687
1 1/8-7
1.1250
1.0322
.9394
63/64
.9844
12
1.1250
1.0709
1.0168
1 3/64
1.0469
1 1/4-7
1.2500
1.1572
1.0644
1 7/64
1.1094
12
1.2500
1.1959
1.1418
1 11/64
1.1719
1 3/8-6
1.3750
1.2668
1.1585
1 7/32
1.2187
12
1.3750
1.3209
1.2668
1 19/64
1.2969
1 1/2-6
1.5000
1.3917
1.2835
1 11/32
1.3437
12
1.5000
1.4459
1.3918
1 27/64
1.4219
1 5/8-5 1/2
1.6250
1.5070
1.3888
1 29/64
1.4531
1 3/4-5
1.7500
1.6201
1.4902
1 9/16
1.5625
1 7/8-5
1.8750
1.7451
1.6152
1 11/16
1.6875
2-4 1/2
2.0000
1.8557
1.7113
1 25/32
1.7812
2 1/8-4 1/2
2.1250
1.9807
1.8363
1 29/32
1.9062
2 1/4-4 1/2
2.2500
2.1057
1.9613
2 1/32
2.0312
2 3/8-4
2.3750
2.2126
2.0502
2 1/8
2.1250
2 1/2-4
2.5000
2.3376
2.1752
2 1/4
2.2500
5-25
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