Hot Products
Continuous Length Extension Springs from China Suppliers - Ideal for Prototypes and Maintenance Applications from Factory
Feature
Sizes
Wire Diameter and Outside Diameters Match SMS Spring's most popular extension spring dimensions from .125" (3.18 mm) to 1.125" Outside Diameter (28.58 mm)
Materials
Music wire with light oil coat, 302 Stainless Steel
Lengths Offered
12", 24", 36"
Programing
Step 1
Fold the spring 180° at desired length and cut. Cut shorter than needed by one-half the coil body diameter.
Step 2
Across from cut end, bend last coil up at 45° angle. To form double loop, bend last two coils up by 45°; do not use heat!
Step 3
Twist the cut end of loop into the center of the coil body. This may require pliers. You may have to twist past the center to allow the loop to flex back.
Step 4
Cut end of newly formed loop to obtain any gap needed for mounting.
Special Calculations
To determine the spring rate per inch of extension at the final cut length, use the following formula:
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Rate = K / N
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N = "Number of Coils per inch" as specified for the stock item X Final Body Length in inches
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To determine load at an extended length: multiply deflection by the spring rate and add to the Initial Tension.
Frequently Asked Questions
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What sizes are available for continuous length extension springs?Continuous length extension springs are available in wire diameters and outside diameters matching SMS Spring's most popular dimensions, ranging from .125" (3.18 mm) to 1.125" Outside Diameter (28.58 mm).
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What materials are used in the manufacture of these extension springs?These springs are made from music wire with a light oil coat, as well as 302 Stainless Steel, ensuring durability and corrosion resistance for a wide range of applications.
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What standard lengths are offered for continuous length extension springs?Standard stock lengths offered are 12", 24", and 36", making them convenient for prototype development, maintenance applications, and custom fabrication needs.
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How do I cut and form a loop from a continuous length extension spring?Fold the spring 180° at the desired length and cut, making it slightly shorter than needed by one-half the coil body diameter. Then bend the last coil(s) up at a 45° angle to form a single or double loop. Twist the cut end into the coil center using pliers if necessary, then trim to the required gap for mounting.
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How do I calculate the spring rate at a custom cut length?Use the formula: Rate = K / N, where N equals the "Number of Coils per inch" as specified for the stock item multiplied by the Final Body Length in inches. This allows you to determine the spring rate per inch of extension at any custom cut length.
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How do I determine the load at a specific extended length?To determine the load at an extended length, multiply the deflection (extension beyond free length) by the spring rate, then add the Initial Tension value. This provides an accurate load estimate for your specific application requirements.