spring , Iran

A double spring is a mechanical element composed of two concentric or coaxial springs designed to increase load capacity and improve stability. Wire diameter for each spring typically ranges from 0.5 to 12 mm, and overall outer diameter varies from 10 to 150 mm. The free length ranges between 20 and 400 mm, with equivalent stiffness from 5 to 3000 N/mm. Common materials include chrome spring steel or fatigue resistant stainless steel. Surface coatings such as nickel, zinc, or phosphate enhance corrosion and wear resistance.

Structurally, double springs can be assembled in series or parallel to produce linear or progressive load characteristics. The manufacturing process includes CNC coiling of each spring, stress relief heat treatment at 200 to 450°C, and precise dimensional calibration. Load and deflection testing with ±1 percent accuracy evaluates assembly performance. This structure reduces sudden failure risk and increases service life beyond one million cycles. Double springs are used in suspension systems, industrial equipment, and safety mechanisms.You can order and buy spring from Iran by contacting us through whatsaap and email.
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