Seascrewmarine

The chart below lists the conversion between imperial and metric measurements

1/4"

=

6.4mm

2.1/4"

=

57.2mm

5/6"

=

7.9mm

2.5/16"

=

28.7mm

3/8"

=

9.5mm

2.3/8"

=

60.3mm

7/16"

=

11.1mm

2.7/16"

=

61.9mm

1/2"

=

12.7mm

2.1/2"

=

63.5mm

5/8"

=

15.9mm

2.5/8"

=

66.7mm

3/4"

=

19.1mm

2.3/4"

=

69.9mm

7/8"

=

22.2mm

2.7/8"

=

73.0mm

1"

=

25.4mm

3"

=

76.2mm

1.1/4"

=

31.8mm

3.1/4"

=

82.6mm

1.5/16"

=

33.3mm

3.5/16"

=

84.1mm

1.3/8"

=

34.9mm

3.3/8"

=

85.7mm

1.7/16"

=

36.5mm

3.7/16"

=

87.3mm

1.1/2"

=

38.1mm

3.1/2"

=

88.9mm

1.5/8"

=

41.3mm

3.5/8"

=

92.1mm

1.3/4"

=

44.5mm

3.3/4"

=

95.3mm

1.7/8"

=

47.6mm

3.7/8"

=

98.4mm

2"

=

50.8mm

4"

=

101.6mm

 


The chart below lists the screw No sizes and gives the equivalent thread/shaft diameter in millimetres.

Screw Size No.4

=

2.9mm

Screw Size No.6

=

3.5mm

Screw Size No.7

=

3.9mm

Screw Size No.8

=

4.2mm

Screw Size No.10

=

4.8mm

Screw Size No.12

=

5.5mm

Screw Size No.14

=

6.3mm