HomeConversions

 Conversions 

Discounts: Save 5% when you spend over £500 and 10% when you spend over £1,000 ex VAT. Savings applied automatically. Spending over £2,500? Call us: 01274 875479

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