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Traction spring
The Extension Spring is made of patented drawn spring steel wire designed in accordance to EN 10270. The Type DH are suitable for wires with a diameter of 1.9 mm, while Type SH are fitted in wires with 2.0 mm to 10.0 mm diameters. The stainless steel rings are designed using spring steel cable material number 1.4310. This feature is made in accordance to EN10270 part 3 (AISI302 or BS301S21) standards.