Hot Products
Continuous Length Extension Springs from China Suppliers - Custom Cut for Prototypes by 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"
Programming
1
Fold the spring 180° at desired length and cut. Cut shorter than needed by one-half the coil body diameter.
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!
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.
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:
- ❑ Rate = K / N
- ❑ N = "Number of Coils per inch" as specified for the stock item × Final Body Length in inches
- ❑ To determine load at an extended length: multiply deflection by the spring rate and add to the Initial Tension.
Frequently Asked Questions
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 extension spring dimensions, ranging from .125" (3.18 mm) to 1.125" Outside Diameter (28.58 mm).
What materials are used in Continuous Length Extension Springs?
Continuous Length Extension Springs are manufactured from Music wire with a light oil coat, as well as 302 Stainless Steel, ensuring durability and corrosion resistance for various applications.
What lengths are offered for Continuous Length Extension Springs?
Continuous Length Extension Springs are offered in three standard lengths: 12", 24", and 36", providing flexibility for prototype development and maintenance applications.
How do I program (cut and form) a Continuous Length Extension Spring to the desired length?
To program the spring, first fold it 180° at the desired length and cut 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 the loop — do not use heat. Next, twist the cut end into the center of the coil body using pliers if necessary, and finally trim the loop end to achieve the required mounting gap.
How do I calculate the spring rate for a Continuous Length Extension Spring after cutting?
To determine the spring rate per inch of extension at the final 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 precise calculation for your specific application requirements.
How do I determine the load at an extended length for these springs?
To determine the load at an extended length, multiply the deflection amount by the calculated spring rate, then add the Initial Tension value. This gives the total force exerted by the spring at any given extended position.