Sea Screw Ltd
Marine Hardware and Fixings
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The charts below shows the conversion between imperial and metric measurements and the size in millimetres for the different screw sizes.

IMPERIAL   METRIC
1/4"   6.4mm
5/6"   7.9mm
3/8"   9.5mm
7/16"   11.1mm
1/2"   12.7mm
5/8"   15.9mm
3/4"   19.1mm
7/8"   22.2mm
1"   25.4mm
1.1/4"   31.8mm
1.5/16"   33.3mm
1.3/8"   34.9mm
1.7/16"   36.5mm
1.1/2"   38.1mm
1.5/8"   41.3mm
1.3/4"   44.5mm
1.7/8"   47.6mm
2"   50.8mm
2.1/4"   57.2mm
2.5/16"   28.7mm
2.3/8"   60.3mm
2.7/16"   61.9mm
2.1/2"   63.5mm
2.5/8"   66.7mm
2.3/4"   69.9mm
2.7/8"   73.0mm
3"   76.2mm
3.1/4"   82.6mm
3.5/16"   84.1mm
3.3/8"   85.7mm
3.7/16"   87.3mm
3.1/2"   88.9mm
3.5/8"   92.1mm
3.3/4"   95.3mm
3.7/8"   98.4mm
4"   101.6mm
SCREW NUMBER   SIZE
Size No. 4   2.9mm
Size No. 6   3.5mm
Size No. 7   3.9mm
Size No. 8   4.2mm
Size No. 10   4.8mm
Size No. 12   5.5mm
Size No. 14   6.3mm
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Sea Screw Ltd. 4 Churchdale Road, Eastbourne, East Sussex. BN22 8PS.