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Screw Information

 

Screw Gauge


The diameter of the head is approximately proportional to the gauge of the screw.

Woodscrew Diameter - Gauge 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20
Woodscrew Diameter - mm 1.78 2.06 2.39 2.74 3.10 3.45 3.81 4.17 4.52 4.86 5.59 6.30 7.01 7.72 8.43

 

Screw Length


NB: The length measured for a roundhead screw is taken from below the head.



Conversion Tables


Woodscrew/Chipboard Lengths

Inch 1/4 3/8 1/2 5/8 3/4 7/8 1 1 1/4 1 3/8 1 1/2 1 5/8 1 3/4 1 7/8 2
mm 6.35 9.53 12.70 15.98 19.05 22.23 25.40 31.75 34.93 38.10 41.38 44.45 47.63 50.80

 

Drive Type




Screwdriver Bit Sizes

 

Screwdriver Screw
Size Imperial Metric
No.1 4, 5, 6, 7 M3, M3.5
No.2 7, 8, 10, M3.5, M4, M4.5, M5
No.3 12, 14 M5.5, M6
No.4 14 M6