Tap Drill Sizes Tormach

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T
T
/D
c
ormach
ap
rill
harT
Tap Drill
Decimal
Forming Taps
Decimal
Decimal
Decimal
Metric Tap
(mm)
(inch)
(65% thread (in)
Drill Size
Tap Size
Drill Size
Tap Size
Drill Size
Tap Size
Equivalent
Equivalent
Equivalent
M1.6 x 0.35 1.25
.0492
.0569
80
.0135
9/64
.1406
U
.3680
7/16 - 14
M1.8 x 0.35 1.45
.0571
.0648
3/8
79
.0145
27
.1440
.3750
M2 x 0.4
1.60
.0630
.0718
1/64
.0156
26
.1470
V
.3770
M2.2 x 0.45 1.75
.0689
.0788
78
.0160
25
.1495
10 - 24
W
.3860
M2.5 x 0.45 2.05
.0807
.0906
77
.0180
24
.1520
25/64
.3906
7/16 - 20
M3 x 0.5
2.50
.0984
.1094
76
.0200
23
.1540
X
.3970
M3.5 x 0.6
2.90
.1142
.1274
75
.0210
5/32
.1562
Y
.4040
M4 x 0.7
3.30
.1299
.1453
74
.0225
22
.1570
13/32
.4062
M4.5 x 0.75 3.70
.1457
.1641
73
.0240
21
.1590
10 - 32
Z
.4130
M5 x 0.8
4.20
.1654
.1829
72
.0250
20
.1610
27/64
.4219
1/2 - 13
M6 x 1
5.00
.1968
.2188
71
.0260
19
.1660
7/16
.4375
M7 x 1
6.00
.2362
.2582
70
.0280
18
.1695
29/64
.4531
1/2 - 20
M8 x 1.25
6.70
.2638
.2932
69
.0292
11/64
.1719
15/32
.4688
M8 x 1
7.00
.2756
.2976
68
.0310
17
.1730
31/64
.4844
9/16 - 12
M10 x 1.5
8.50
.3346
.3676
1/32
.0312
16
.1770
12 - 24
1/2
.5000
M10 x 1.25 8.70
.3425
.3719
67
.0320
15
.1800
33/64
.5156
9/16 - 18
M12 x 1.75 10.20
.4016
.4420
66
.0330
14
.1820
12 - 28
17/32
.5312
5/8 - 11
M12 x 1.25 10.80
.4252
.4507
65
.0350
13
.1850
35/64
.5469
M14 x 2
12.00
.4724
.5164
64
.0360
3/16
.1875
9/16
.5625
M14 x 1.5
12.50
.4921
.5251
63
.0370
12
.1890
37/64
.5781
5/8 - 18
M16 x 2
14.00
.5512
.5951
62
.0380
11
.1910
19/32
.5938
M16 x 1.5
14.50
.5709
.6038
61
.0390
10
.1935
39/64
.6094
M18 x 2.5
15.50
.6102
.6652
60
.0400
9
.1960
5/8
.6250
M18 x 1.5
16.50
.6496
.6826
59
.0410
8
.1990
41/64
.6406
M20 x 2.5
17.50
.6890
.7439
58
.0420
7
.2010
1/4 - 20
21/32
.6562
3/4 - 10
M20 x 1.5
18.50
.7283
.7613
57
.0430
13/64
.2031
43/64
.6719
M22 x 2.5
19.50
.7677
.8226
56
.0465
6
.2040
11/16
.6875
3/4 - 16
M22 x 1.5
20.50
.8071
.8400
3/64
.0469
0 - 80
5
.2055
45/64
.7031
M24 x 3
21.00
.8268
.8927
55
.0520
4
.2090
23/32
.7188
M24 x 2
22.00
.8661
54
.0550
3
.2130
1/4 - 28
47/64
.7344
M27 x 3
24.00
.9449
53
.0595
1 - 64, 72
7/32
.2188
3/4
.7500
M27 x 2
25.00
.9843
1/16
.0625
2
.2210
49/64
.7656
7/8 - 9
M30 x 3.5
26.50
1.0433
52
.0635
1
.2280
25/32
.7812
M30 x 2
28.00
1.1024
51
.0670
A
.2340
51/64
.7969
M33 x 3.5
29.50
1.1614
50
.0700
2 - 56, 64
15/64
.2344
13/16
.8125
7/8 - 14
M33 x 2
31.00
1.2205
49
.0730
B
.2380
53/64
.8281
M36 x 4
32.00
1.2598
48
.0760
C
.2420
27/32
.8438
M36 x 3
33.00
1.2992
5/64
.0781
D
.2460
55/64
.8594
M39 x 4
35.00
1.3780
47
.0785
3 - 48
1/4 E
.2500
7/8
.8750
1 - 8
M39 x 3
36.00
1.4173
46
.0810
F
.2570
5/16 - 18 57/64
.8906
45
.0820
3 - 56
G
.2610
29/32
.9062
Unified Threads - Based on 65% Thread (in)
44
.0860
17/64
.2656
59/64
.9219
1 - 12
Forming
Forming
43
.0890
4 - 40
H
.2660
15/16
.9375
1 - 14
Tap Size
Tap Drill
Tap Size
Tap Drill
42
.0935
4 - 48
I
.2720
5/16 - 24 61/64
.9531
0-80
.0545
12-28
.2002
3/32
.0938
J
.2770
31/32
.9688
1-64
.0661
1/4-20
.2279
41
.0960
K
.2810
63/64
.9844
1 1/8 - 7
1-72
.0669
1/4-28
.2342
40
.0980
9/32
.2812
1
1.0000
2-56
.0781
5/16-18
.2879
39
.0995
L
.2900
1 3/64
1.0469
1 1/8 - 12
2-64
.0791
5/16-24
.2941
38
.1015
5 - 40
M
.2950
1 7/64
1.1094
1 1/4 - 7
3-48
.0898
3/8-16
.3474
1 1/8
37
.1040
5 - 44
19/64
.2969
1.1250
3-56
.0911
3/8-24
.3566
36
.1065
6 - 32
N
.3020
1 11/64
1.1719
1 1/4 - 12
4-40
.1010
7/16-14
.4059
7/64
.1094
5/16
.3125
3/8 - 16
1 7/32
1.2188
1 3/8 - 6
4-48
.1028
7/16-20
.4154
1 1/4
35
.1100
O
.3160
1.2500
5-40
.1140
1/2-13
.4660
34
.1110
P
.3230
1 19/64
1.2969
1 3/8 - 12
5-44
.1150
1/2-20
.4779
33
.1130
6 - 40
21/64
.3281
1 11/32
1.3438
1 1/2 - 6
6-32
.1242
9/16-12
.5257
1 3/8
32
.1160
Q
.3320
3/8 - 24
1.3750
6-40
.1270
9/16-18
.5379
31
.1200
R
.3390
1 27/64
1.4219
1 1/2 - 12
8-32
.1502
5/8-11
.5848
1/8
.1250
11/32
.3438
1 1/2
1.5000
8-36
.1517
5/8-18
.6004
30
.1285
S
.3480
10-24
.1716
3/4-10
.7058
29
.1360
8 - 32, 36
T
.3580
10-32
.1762
3/4-16
.7224
28
.1405
23/64
.3594
12-24
.1976
Pipe Thread Sizes (NPSC)
Thread
Drill
Thread
Drill
Thread
Drill
1/8 - 27
11/32
1 - 11 1/2
1 5/32
3 - 8
3 1/4
1/4 - 18
7/16
1 1/4 - 11 1/2
1 1/2
3 1/2 - 8
3 3/4
3/8 - 18
37/64
1 1/2 - 11 1/2
1 3/4
4 - 8
4 1/4
1/2 - 14
23/32
2 - 11 1/2
2 7/32
3/4 - 14
59/64
2 1/2 - 8
2 21/32

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