Initial tension is the force a spring has when it’s in its natural, unextended state. It’s a crucial factor because it affects how the spring behaves under load. Calculating initial tension ensures the spring operates within its intended range without overstressing.
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Initial tension is the tension sandwiched in between all the closed coils of an extension spring before there's any extension. When you pull on an extension spring and see space in between the coils you have used up your initial tension. Its the built in force in between the coils that the spring exerts before any external load is applied. It’s influenced by the spring’s design, including its wire diameter, coil and outer diameter. Properly accounting for initial tension is important because it determines the baseline force that the spring will apply, impacting how it interacts with other components in a system. Initial tension force is in addition to Spring rate when doing load calculations.
Heavy duty springs, are mostly used in dies but they are not limited to this application. You can find heavy duty springs in farm equipment, construction equipment, clutches, aircrafts, brakes, etc.
There are also rectangular wire springs (Die Springs) that are considered heavy duty springs. However, these are much more expensive (over twice the price of a round wire compression spring) and complicated to work with. For these reasons at The Spring Store we do not manufacture or carry stock die springs. However, we do work with and have several heavy duty springs in stock ready for you to purchase and use in tough and rough environments.
Heavy duty springs can go through several processes to help provide more cyclic-life expectancy.
These processes include:
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Keep in mind that these processes are additional to the manufacturing of your spring so you do have to specifically request them and some may have an extra cost.
Shot peening will help your spring have more life while ground ends will allow it to stand up straight on a flat surface. Plating options are useful if your spring will be functioning around harsh environments. The plating options are sometimes used as a spring safety procedure but they can also serve other functions, such as for visual enhancement. Plating can also provide a decorative function because it can improve the appearance of the spring. Since we provide different plating options and tones you can change the color of your spring and make your device more appealing in cases where the spring is visible.
Some of the plating options offered are:
Ask about our plating options
The lifespan of a heavy duty spring depends largely on the application, the operating environment, and whether additional life-extending processes like shot peening or plating were applied. In general, properly designed and maintained heavy duty springs can last anywhere from several thousand to millions of cycles. Springs exposed to heavy vibration, extreme loads, or corrosive environments may require special coatings or treatments to maximize their durability and performance over time.
Contact our qualified engineers to buy, create or improve a current heavy duty compression spring design. We also carry and work with heavy duty extension and heavy duty torsion springs. Having trouble finding the ideal heavy duty spring in our catalog? No problem! Our sales department is at your disposal to determine whether your spring is in stock or connect you with an engineer that can assist in designing a specialized custom spring for you. Reach out to us now at: (951) 276-
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