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ABBREVIATIONS

d = wire diameter
Di = inner diameter
Do = outer diameter
L0 = free length [mm]
Sn = maximum compression allowed [mm]
Fn = force at max. compression
if = number of active coils [pc]
ig = total number of coils [pc]

Raw material:
EN 10270-1 SH

Tolerances:
R ±10%; Lo ±0.5mm