The color painted on the end coils of a torsion spring identifies the wire diameter, per the official DASMA TDS 171 color coding system.
White
.177"
4.50 mm
Blue
.192"
4.88 mm
Green
.207"
5.26 mm
Yellow
.218"
5.54 mm
Red
.225"
5.72 mm
Brown
.234"
5.94 mm
Orange
.243"
6.17 mm
Gold
.250"
6.35 mm
Light Blue
.262"
6.65 mm
Tan
.273"
6.93 mm
Black
.283"
7.19 mm
Silver/Gray
.295"
7.49 mm
Purple
.307"
7.80 mm
Copper
.331"
8.41 mm
Red/White Stripe
.362"
9.19 mm
References & Standards
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