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This page includes a conversion chart and some technical information on tap & clearance drill sizes which you may find useful. Please scroll down the page to view all information.
Please see our chart below if you need to convert any metric sizes or imperial sizes or vice versa.
1
Gauge
=
1
Swg
=
0.300”
or
7.620mm
2
Gauge
=
2
Swg
=
0.276”
or
7.010mm
3
Gauge
=
3
Swg
=
0.252”
or
6.401mm
4
Gauge
=
4
Swg
=
0.232”
or
5.893mm
5
Gauge
=
5
Swg
=
0.212”
or
5.385mm
6
Gauge
=
6
Swg
=
0.192”
or
4.877mm
7
Gauge
=
7
Swg
=
0.176”
or
4.470mm
8
Gauge
=
8
Swg
=
0.160”
or
4.064mm
9
Gauge
=
9
Swg
=
0.144”
or
3.658mm
10
Gauge
=
10
Swg
=
0.128”
or
3.251mm
11
Gauge
=
11
Swg
=
0.116”
or
2.946mm
12
Gauge
=
12
Swg
=
0.104”
or
2.642mm
13
Gauge
=
13
Swg
=
0.092”
or
2.337mm
14
Gauge
=
14
Swg
=
0.080”
or
2.032mm
15
Gauge
=
15
Swg
=
0.072”
or
1.829mm
16
Gauge
=
16
Swg
=
0.064”
or
1.626mm
17
Gauge
=
17
Swg
=
0.056”
or
1.422mm
18
Gauge
=
18
Swg
=
0.048”
or
1.219mm
19
Gauge
=
19
Swg
=
0.040”
or
1.016mm
20
Gauge
=
20
Swg
=
0.036”
or
0.914mm
21
Gauge
=
21
Swg
=
0.032”
or
0.813mm
22
Gauge
=
22
Swg
=
0.028”
or
0.711mm
23
Gauge
=
23
Swg
=
0.024”
or
0.610mm
24
Gauge
=
24
Swg
=
0.022”
or
0.559mm
25
Gauge
=
25
Swg
=
0.020”
or
0.508mm
26
Gauge
=
26
Swg
=
0.018”
or
0.457mm
27
Gauge
=
27
Swg
=
0.0164”
or
0.417mm
28
Gauge
=
28
Swg
=
0.0148”
or
0.376mm
29
Gauge
=
29
Swg
=
0.0136”
or
0.345mm
30
Gauge
=
30
Swg
=
0.0124”
or
0.315mm
Please see the following chart for Tap & Clearance Drill Size Information
Metric Tap & Clearance Drill Sizes
Tap Drill
Clearance Drill
75% Thread for Aluminium, Brass & Plastics
50% Thread for Steel, Stainless & Iron
Close Fit
Standard Fit
Screw Size
Thread Pitch (mm)
Drill Size (mm)
Drill Size (mm)
Drill Size (mm)
Drill Size (mm)
M 3
0.60
2.40
2.60
3.15
3.15
3.30
3.30
0.50
2.50
2.70
M 4
0.75
3.25
3.50
4.20
4.20
4.40
4.40
0.70
3.30
3.50
M 5
1.00
4.00
4.40
5.25
5.25
5.25
5.50
5.50
5.50
0.90
4.10
4.40
0.80
4.20
4.50
M 8
1.25
6.80
7.20
8.40
8.40
8.80
8.80
1.00
7.00
7.40
M 10
1.50
8.50
9.00
10.50
10.50
10.50
11.00
11.00
11.00
1.25
8.80
9.20
1.00
9.00
9.40
M 12
1.75
10.30
10.90
12.60
12.60
12.60
13.20
13.20
13.20
1.50
10.50
11.00
1.25
10.80
11.20
M 16
2.00
14.00
14.75
16.75
16.75
17.50
17.50
1.50
14.50
15.00
M 20
2.50
17.50
18.50
21.00
21.00
21.00
22.00
22.00
22.00
2.00
18.00
18.50
1.50
18.50
19.00
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