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EXTENSION SPRINGS
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MATERIAL
Music wire to EN 10270-1 SH
Stainless steel wire to EN 10270-3 (1.4310)
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COILED
Right hand
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ENDS
German loops closed. End position may vary
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TOLERANCES
All dimensions and forces to DIN 2097 (Grade 2)
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SURFACE FINISH
Oiled for music wire springs
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d
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Wire diameter
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De
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Outside diameter
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Dm
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Mean coil diameter (De-d)
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Lo
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Free length (inside hooks)
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L1
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Maximum extended length
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P1
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Load at L1
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P/f
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Rate
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f1
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Extension at force P1
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1 Newton
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0,10197 Kg.
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To determine the load at any working length, use (rate x deflection) + initial tension.
Initial tension = P1-(P/f x f1)
L1 = Lo + f1
P1 for stainless steel = 0.883 x P1 music wire.
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