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Screw sizes
  

Imperial and metric equivalents
 
Just when I had more or less come to remember what size wood screw I should buy for a particular task somebody decided that henceforth screws would be referred to by entirely metric dimensions.
Screw diameters Screw lengths
#4
3 mm
#6
3.5 mm
#8
4 mm
#10
5 mm
#12
5.5 mm
#14
6 mm
¼ inch
6 mm
½ inch
12 or 13 mm
  16 mm
¾ inch
about 20 mm
1 inch
25 mm
1¼ inch
30 mm
1½ inch
  
35 mm
  40 mm
1¾ inch
  
2 inch
 50 mm
3 inch
 76 mm
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