Definition: Torsional spring finder search engine used to locate a specific torsion spring which meets the dimensional ranges specified by the user to accomplish their needs.

Search, Find, and Locate Your Torsional Spring!

Search for your torsional springs and locate them FAST using The Spring Store's Torsion Spring Finder. Spring finder allows you to find the ideal stock spring for your mechanism, device, invention, etc. amongst over 40,000 stock torsion springs in our torsional spring catalogue store. You only have to input one dimension and enter the ranges in which the dimension will be searched by. The options for a quick, basic search are outer diameter, inner diameter, total coils, and rate. There is more, though. You are able to click on the option "Search More Fields" at the bottom of the Finder. These spring specifications include torque, deflection (degrees of travel), body length, leg lengths 1 and 2, wire diameter, and material type. You may input all of these dimensions in either the english or metric units of measurement. The following diagrams and examples will show you the step by step process of finding your torsional spring.

Step 1.) Select The Unit of Measurement

With Spring Finder, you are able to search for your standard torsional springs in whichever unit of measurement you find best. Whether it is in english (inches and pounds) or metric (millimeters and newtons) units.

Step 2.) Enter Your Torsion Spring Dimensions

Spring Finder is a fast and easy to use search engine. It is user friendly and provides you with a how-to-measure diagram as well as icons for each respective torsional spring dimension. The following are the spring dimensions Spring Finder allows you to use when locating your stock torsion springs.

• Outer Diameter -The outer width (outer diameter) of your spring's coils.
• Inner Diameter - Make Sure that the inner width (inner diameter) of your spring's coils isn't too tight or too loose over the shaft where the spring will be installed.
• Total Coils - The amount of spirals (coils) that make up your spring's body length and determine its free position.
• Spring Rate - The constant amount of force it takes for your torsion spring to travel one degree of deflection (in-lbs/deg or N-mm/deg)
• Torque - The amount of load (torque) your torsional spring will be required to resist.
• Deflection (Degrees of Travel) - The traveled distance between your coil spring's free position and loaded/torqued position.
• Body Length - The overall length of your spring's body. Make sure you will have enough room on the mandrel's length.
• Leg Lengths 1 and 2 - The length of your spring's legs.
• Wire Diameter: Affects spring force and determines an approximate range of your torsion spring's size.
• Material Type - The type of wire used to manufacture the spring. You may choose from music wire (MW), stainless steel 302 (SST), stainless steel 17-7 (17-7), beryllium copper (BC), hard drawn (HD), chrome silicon (CS), oil tempered (OT), and phosphor bronze (PB).

Step 3.) Search, Find, and Locate Your Torsional Spring

This is where you click on the "Search" button and get all the stock torsion spring results that Spring Finder was able to locate in our torsion spring catalogue. Locate the torsional springs which might work best and find the ideal torsion spring for your mechanism.

Select the springs which you find the closest to your design. Then, you may compare the dimensions and specifications like rate per degree, maximum deflection (travel), and maximum torque. To calculate the amount of torque you will achieve out of a torsion spring, follow the formulas provided. This formula may be broken into three separate formulas depending on what it is you want to calculate; rate per degree, torque, or travel. In this case, you are already provided with the spring rate per degree so you will be wanting to calculate either load or travel. Below are these formulas.

Maximum deflection is the maximum amount of travel you can achieve under the maximum torque possible based on your torsional spring's rate.

Calculate Torque:

To calculate a torque you must multiply the torsion spring rate per degree by the total amount of degrees traveled from your spring's free position to its torqued position. Please note that you must stay within the suggested max torque because that is the elastic limit of the spring. Going further than the suggested max torque, can cause your spring to take a permanent set thus losing torque and travel.

F = kx

• F = Torque
• k = Rate
• x = Travel

Calculate Travel:

To calculate the amount of travel your spring can achieve under a certain torque, divide the torque by the spring rate. Please note that you must stay within the suggested max deflection because that is the elastic limit of the spring. Going further than the suggested max deflection, can cause your spring to take a permanent set thus losing load and travel.

x = F÷k

F = Torque

k = Rate

x = Travel