Description Overview Non-phosphated spring wires according to EN 10270-1 Specifications 1.35 mm diameter, tolerance +0.02/-0.03 mm, tensile strength 1650–1850 N/mm², 500 kg rosette coil on cardboard tube 2.38 mm diameter, tolerance +0.02/-0.03 mm, tensile strength 1650–1850 N/mm², 800 kg rosette coil on cardboard tube 5.00 mm diameter, tolerance +/-0.35 mm, class SL, tensile strength 1260–1450 N/mm², Z4 coil up to 1200 kg 5.00 mm diameter, tolerance +/-0.35 mm, class SM, tensile strength 1460–1650 N/mm², Z4 coil up to 1200 kg Condition Non-phosphated surface finish Rosette coil or Z4 coil packaging on cardboard tube FCA