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Technical Information Tapping Drill Size Chart
All sizes are“ suggested sizes” only and may be varied to suit individual requirements
468
M ISO Metric Coarse( 60 °)
Pitch Tapping Drill mm mm
Tap Size
M1.6
0.35
1.25
M2
0.4
1.6
M2.5
0.45
2.05
M3
0.5
2.5
M3.5
0.6
2.9
M4
0.7
3.3
M4.5
0.75
3.7
M5
0.8
4.2
M6
1.0
5.0
M8
1.25
6.8
M10
1.5
8.5
M12
1.75
10.2
M14
2.0
12.0
M16
2.0
14.0
M18
2.5
15.5
M20
2.5
17.5
M22
2.5
19.5
M24
3.0
21.0
M27
3.0
24.0
M30
3.5
26.5
M33
3.5
29.5
M36
4.0
32.0
M42
4.5
37.5
M45
4.5
40.5
M48
5.0
43.0
M52
5.0
47.0
M56
5.5
50.5
MF ISO Metric Fine( 60 °)
Pitch Tapping Drill mm mm
Tap Size
M4
0.5
3.5
M5
0.5
4.5
M6
0.75
5.3
M8
1.0
7.0
M10 **
1.0
9.0
M10
1.25
8.8
M12 **
1.25
10.8
M12
1.5
10.5
M14 **
1.25
12.8
M14
1.5
12.5
M16 *
1.5
14.5
M18 **
1.5
16.5
M20 *
1.5
18.5
M22
1.5
20.5
M24
2.0
22.0
M25 *
1.5
23.5
M32 *
1.5
30.5
M40 *
1.5
38.5
M50 *
1.5
48.5
* Metric Conduit ** Spark Plug
8UN( 8 TPI) Unified National Form( 60 °)
Tap Tapping Drill
T. P. I. Size mm
1-1 / 8
8
25.5
1-1 / 4
8
28.5
1-3 / 8
8
31.75
1-1 / 2
8
35.0
1-5 / 8
8
38.0
1-3 / 4
8
41.5
1-7 / 8
8
44.5
2
8
47.5
UNC Unified National Coarse( 60 °)
Tap Tapping Drill
T. P. I. Size mm
# 2( 0.086)
56
1.85
# 3( 0.099)
48
2.1
# 4( 0.112)
40
2.3
# 5( 0.125)
40
2.6
# 6( 0.138)
32
2.8
# 8( 0.164)
32
3.4
# 10( 0.190)
24
3.8
# 12( 0.216)
24
4.5
1 / 4
20
5.1
5 / 16
18
6.6
3 / 8
16
8.0
7 / 16
14
9.4
1 / 2
13
10.8
9 / 16
12
12.2
5 / 8
11
13.5
3 / 4
10
16.5
7 / 8
9
19.5
1
8
22.2
1-1 / 8
7
25.0
1-1 / 4
7
28.0
1-3 / 8
6
31.0
1-1 / 2
6
34.0
1-3 / 4
5
39.5
2
4.5
45.0
UNF Unified National Fine( 60 °)
Tap Tapping Drill
T. P. I. Size mm
# 3( 0.099)
56
2.1
# 4( 0.112)
48
2.35
# 5( 0.125)
44
2.65
# 6( 0.138)
40
2.9
# 8( 0.164)
36
3.5
# 10( 0.190)
32
4.1
# 12( 0.216)
28
4.6
3 / 16 *
32
4.0
1 / 4
28
5.5
5 / 16
24
6.9
3 / 8
24
8.5
7 / 16
20
9.8
1 / 2
20
11.5
9 / 16
18
12.8
5 / 8
18
14.5
3 / 4
16
17.5
7 / 8
14
20.5
1
12
23.5
1 *
14
24.0
1-1 / 8
12
26.5
1-1 / 4
12
29.5
1-3 / 8
12
33.01
1-1 / 2
12
36.0
* UNS
UNEF Unified National Form( 60 °)
Tap Tapping Drill
T. P. I. Size mm
1 / 4
32
5.6
5 / 16
32
7.2
3 / 8
32
8.8
1 / 2
28
11.8
5 / 8
24
14.75
3 / 4
20
18
1
20
24.2
BSW British Standard Whitworth( 55 °)
Tap Tapping Drill
T. P. I. Size mm
1 / 16 *
60
1.2
3 / 32 *
48
1.85
1 / 8
40
2.55
5 / 32 *
32
3.2
3 / 16
24
3.7
7 / 32 *
24
4.5
1 / 4
20
5.1
5 / 16
18
6.5
3 / 8
16
7.9
7 / 16
14
9.3
1 / 2
12
10.5
9 / 16
12
12.1
5 / 8
11
13.5
3 / 4
10
16.25
7 / 8
9
19.25
1
8
22.0
1-1 / 8
7
24.75
1-1 / 4
7
28.0
1-1 / 2
6
33.5
1-3 / 4
5
39.0
2
4-1 / 2
44.5
* WHIT. Form
BSF British Standard Fine( 55 °)
Tap Tapping Drill
T. P. I. Size mm
3 / 16
32
4.0
7 / 32
28
4.6
1 / 4
26
5.3
5 / 16
22
6.8
3 / 8
20
8.3
7 / 16
18
9.8
1 / 2
16
11.0
9 / 16
16
12.7
5 / 8
14
14.0
11 / 16
14
15.5
3 / 4
12
16.75
7 / 8
11
19.75
1
10
22.75
1-1 / 8
9
25.5
1-1 / 4
9
28.5
1-1 / 2
8
34.5
1-3 / 4
7
41.0
BSB British Standard Brass( 55 °)
Tap Tapping Drill
T. P. I. Size mm
1 / 4
26
5.2
5 / 16
26
6.8
3 / 8
26
8.4
7 / 16
26
10.0
1 / 2
26
11.6
9 / 16
26
13.2
5 / 8
26
14.8
3 / 4
26
18.0
7 / 8
26
20.8
1
26
24.3
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