Metric/Imperial Conversion Chart

Gauge
mm

Length
mm

Imperial
Size

Gauge
mm

Length
mm

Imperial
Size

3

12

4 x 1/2

3.5

12

6 x 1/2

16

4 x 5/8

16

6 x 5/8

20

4 x 3/4

20

6 x 3/4

25

4 x 1

25

6 x 1

30

4 x 1 1/4

30

6 x 1 1/4

40

4 x 1 1/2

40

6 x 1 1/2

4

12

8 x 1/2

4.5

25

9 x 1

16

8 x 5/8

30

9 x 1 1/4

20

8 x 3/4

35

9 x 1 3/8

25

8 x 1

40

9 x 1 1/2

30

8 x 1 1/4

45

9 x 1 3/4

35

8 x 1 3/8

50

9 x 2

40

8 x 1 1/2

60

9 x 2 3/8

45

8 x 1 3/4

70

9 x 2 3/4

50

8 x 2

75

9 x 3

60

8 x 2 3/8

70

8 x 2 3/4

5

25

10 x 1

6

30

12 x 1 1/4

30

10 x 1 1/4

40

12 x 1 1/2

35

10 x 1 3/8

50

12 x 2

40

10 x 1 1/2

60

12 x 2 3/8

45

10 x 1 3/4

70

12 x 2 3/4

50

10 x 2

75

12 x 3

60

10 x 2 3/8

80

12 x 3 1/4

70

10 x 2 3/4

90

12 x 3 1/2

75

10 x 3

100

12 x 4

80

10 x 3 1/4

110

12 x 4 3/8

90

10 x 3 1/2

130

12 x 5 1/8

100

10 x 4

150

12 x 6