Screw Head Widths
Of the screw-heads we do know that 4 mm screw width across flats to be 7 mm and 5 mm screw 8 mm.
7 mm / 4 mm = 1.75
8 mm / 5 mm = 1.60
Golden Ratio
We define the width across flats, according to Golden Ratio 1.6(18);
4 mm x 1,618 = 6.472 - 5 mm x 1.618 = 8.09
6.472 mm => 7.0 mm
8.09 => 8.0 mm
Metric Srews
4 - 5 - 6 - 8 - 10 - 12 - 16 - 20 Screws mm
7 - 8 - 10 - 13 - 17 - 19 - 24 - 30 Width across flats of the screw mm
4 x 1.6(18) = 6.4 mm
5 x 1.6(18) = 8.0 mm
6 x 1.6(18) = 9.6 mm
8 x 1.6(18) = 12.8 mm
10 x 1.6(18) = 16 mm
12 x 1.6(18) = 19.2 mm
16 x 1.6(18) = 25.6 mm
20 x 1.6(18) = 32 mm
10 mm screw; the width across flats of the screw could be 16 mm, instead of the 17 mm.
16 mm screw; the width across flats of the screw is smaller than defined 25.6 mm.
20 mm screw is by calculating defined to 32 mm, but selected 30 mm.
All defined widths fill up the requirements of the screw.
22.5.2015*09:00 (1043 - 708)
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