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| Tehran-South |  |
| +989122003350 | |
- Price :negotiated
spring , Iran
An extension spring is a helical elastic element designed to withstand axial tensile loads and generate restoring force. Wire diameter typically ranges from 0.2 to 12 millimeters, while outer diameter varies between 3 and 120 millimeters. The shear modulus of spring steel is approximately 79 gigapascals, and allowable tensile stress is defined between 500 and 1100 megapascals. Initial tension is created through pre twisting of the wire and may equal 5 to 30 percent of rated load. The spring rate is calculated using k equals Gd to the fourth power divided by 8nD to the third power. The spring index is commonly maintained between 6 and 12 to reduce stress concentration.
The structure consists of tightly wound coils without free pitch and two end hooks or loops for attachment. Free length may range from 10 to 500 millimeters, and maximum allowable extension is typically 20 to 40 percent of free length. Stress relief heat treatment is performed between 200 and 400 degrees Celsius to enhance dimensional stability. Final hardness for carbon steel is adjusted between 42 and 50 HRC. Fatigue life within 10^5 to 10^7 cycles is achieved with a safety factor between 1.3 and 1.8. Quality control includes initial tension testing, fatigue evaluation, and dimensional inspection with 0.01 millimeter accuracy.You can order and buy spring from Iran by contacting us through whatsaap and email.
WEBSITE: spring Iran
Manufacturing Tolerances in Industrial Extension Springs in iran
Manufacturing tolerances in industrial extension springs directly influence initial tension, spring rate, and fatigue life.
Wire diameter is typically controlled within ±0.01 to ±0.03 millimeters to prevent tensile stress from exceeding 45 percent of ultimate strength.
Outer diameter is maintained within ±0.1 millimeters, while pitch deviation is limited to less than 2 percent.
Free length tolerance is generally defined within ±1 to ±2 percent of nominal length depending on accuracy class.
Initial tension is calibrated with a maximum allowable deviation of ±10 percent.
End hooks must be aligned within 3 degrees to minimize stress concentration.
Final inspection includes tensile testing up to 30 percent elongation and cyclic testing of at least 200000 cycles to validate mechanical stability.
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