Stainless steel piano wire Materials Piano springs: Stainless steel conforming to DIN17224, Stainless steel 12CrNi17.7 - Ends: Closed German loops conforming to DIN 2097. Position may vary. - Tolerances: All the dimensions and load values given conform to DIN2097 (Grade 2) - Initial tension Fo = Max load x 0.08 - These springs are recommended for static or medium dynamic loads Info - Springs should not be stretched greater than the maximum elongation value or permanent damage may result. - For custom made springs, please contact us (Minimum quantity may apply)