Oil Tempered Spring Steel Wire for Mattresses and Oil Seal 187; 1.4mm and 2.2mm Spring Wires for Mattresses Spring and Bonnel Spring. For mattresses and bonnell spring blocks production Wire diameter: 1,4 and 2.2 mm Tensile strength: 1960 MPa. Steel wire standard ASTM A 40790 , DIN 17223/184. 187; Galvanized Steel Fine Spring Wire
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