Q41.uk - Wall Plug Sizes
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Wall Plugs
The colour codes used by some wall plug manufacturers are not standard. For this reason, I recommend measuring your plugs whenever size is important. The size colours described below are only examples "drill sizes" to "screw size" conversion is usually reasonably accurate for non structural applications. Drill sizes may not correspond to drill hole diameters!
Common Colours
Wall PlugScrew Drill Size
Yellow3mm to 4mm5
Red4mm to 5mm6
Brown5mm to 7mm7
Blue14mm to 18mm10
Example of Alternative Plug Colours
Wall PlugPlug Size
Blue5mm
Red6mm
Green7mm
Yellow8mm
Plug sizes vary - if in doubt try .5 undersize on first hole (it is easier to enlarge a hole than to shrink it) Try to use screws in middle of size range for plug.