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Width key

Values for calculation

D \mathrm{mm}

Calculation

Width key

\text{if }\ D\le 8
b=2
\text{else if }\ D\le 10
b=3
\text{else if }\ D\le 12
b=4
\text{else if }\ D\le 17
b=5
\text{else if }\ D\le 22
b=6
\text{else if }\ D\le 30
b=8
\text{else if }\ D\le 38
b=10
\text{else if }\ D\le 44
b=12
\text{else if }\ D\le 50
b=14
\text{else if }\ D\le 58
b=16
\text{else if }\ D\le 65
b=18
\text{else if }\ D\le 75
b=20
\text{else if }\ D\le 85
b=22
\text{else if }\ D\le 95
b=25
\text{else if }\ D\le 110
b=28
\text{else if }\ D\le 130
b=32
\text{else if }\ D\le 150
b=36
\text{else if }\ D\le 170
b=40
\text{else if }\ D\le 200
b=45
\text{else if }\ D\le 230
b=50
\text{else if }\ D\le 260
b=56
\text{else if }\ D\le 290
b=63
\text{else if }\ D\le 330
b=70
\text{else if }\ D\le 380
b=80
\text{else if }\ D\le 440
b=90
\text{else}
b=100
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