Wood Screw Guages in Metric

The table below is a guide to show metric equivalents of common Imperial screw gauges. The table contains data on Head diameter and Countersink drill size, Shank diameter and Clearance drill size, Pilot hole sizes for Timber, Rawlplug colours and Masonry drill sizes

ImperialMetricScrewScrew HeadScrewScrew ShankSoftwoodHardwoodMasonry
ScrewScrewHead DiaCountersinkShank DiaClearancePilot DiaPilot DiaPlug Drill
GaugeGuage mmmmDrill mm
mmDrill mmmmmmColourmm
224.366.02.382.51.51.5
32.55.166.02.773.01.51.5Yellow5
435.95 6.02.773.01.52.0Yellow5
63.57.14 8.03.574.02.02.5Red6
848.73 9.03.974.52.53.0Red/Brown6 or 7
1059.9210.04.765.53.03.0Brown7
125.511.1111.05.556.53.03.5Brown7
146.512.7012.0
6.357.03.54.0Blue10