| Exporter, Wholesale, Manufacturer | |
| Tehran-West |  |
| +989122003350 | |
- Price :negotiated
tension Springs , Iran
- Price :To negotiate
- order by whatsapp
An extension spring is a helical elastic element with tightly wound coils designed to withstand axial tensile loads and provide restoring force. Wire diameter typically ranges from 0.2 to 16 millimeters, and outer diameter varies between 4 and 150 millimeters. Initial tension is generated through internal twisting of the wire and defined as 5 to 35 percent of rated load. The shear modulus of spring steel is approximately 79 gigapascals, and allowable tensile stress ranges from 500 to 1000 megapascals. The spring index is generally selected between 6 and 14 to reduce stress concentration. The spring rate is calculated using k equals Gd to the fourth power divided by 8nD to the third power.
The structure consists of a close wound helical body with German, English, or full loop end hooks. Free length may range from 15 to 600 millimeters with 5 to 25 active coils. Stress relief heat treatment is performed between 200 and 420 degrees Celsius. Final hardness of carbon steel after treatment ranges from 40 to 50 HRC. Maximum allowable extension is typically limited to 20 to 45 percent of free length. Quality control includes initial tension testing, fatigue evaluation up to 10^6 cycles, and dimensional inspection with 0.01 millimeter precision.You can order and buy tension Springs from Iran by contacting us through whatsaap and email.
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Industrial Applications of Extension Springs in iran
Extension springs are widely used in industries to provide restoring force under tensile load with allowable strain of 20 to 40 percent of initial length. In the automotive industry, they are applied in throttle mechanisms, parking brakes, and exhaust systems. In industrial equipment, they enable lever return, clutch systems, and locking mechanisms. Sliding doors and light lifting systems use them for motion balance and control. Agricultural machinery benefits from extension springs for vibration absorption and stabilization of moving components. Home appliances such as washing machines and vacuum cleaners use them to control tension in moving parts. Their design is based on allowable shear stress and a safety factor between 1.5 and 2.5. Proper spring wire material and hook design significantly influence durability and fatigue life exceeding 100,000 cycles.