compression spring
As one of the most efficient energy storage devices, spiral compression springs are the most common spring configuration on the market today. From car engines to large household appliances, they are widely used in countless fields.

Although compression springs are usually made of cylindrical circular wires, their customizability is extremely high. Square, oval, rectangular, and other non-circular cross-sectional wires can be designed according to different requirements. In addition, the spring can be changed into shapes such as conical, hourglass, or barrel. In this way, dynamic resonance conditions or height limitations can be solved. The variable pitch between coils provides different spring stiffness throughout the entire working range of the spring and helps minimize resonance fluctuations and vibrations to the greatest extent possible. Due to the ability to customize various compression spring characteristics according to specific situations, this type of spring represents a flexible resistance and energy storage design method.

Tips for designing custom compression springs:
Compression springs can be used in many different devices, from simple ballpoint pens to precision surgical equipment and the world's most advanced airplanes
The design of compression springs may seem simple, but large and small compression springs are very complex. Before choosing a compression spring for a specific purpose, many design factors need to be considered. Firstly, the designer needs to examine the space allocated to the spring to determine the size limits and whether these limits allow the parts to meet the load requirements of the application. Once these limits are specified, the stress level at which the spring operates must be determined. If the design indicates that the spring will withstand excessive stress, the spring will not function properly, which may result in costly design changes.

Available sizes
The wire size range of the spring varies from 0.005 inches to 0.250 inches. We can provide open end, closed end, and combination end configurations. The minimum wire size for compression springs is 0.018 inches, with outer diameters ranging from 0.060 inches to 3 inches, and end grinding services are available. Customers can also choose from our extensive range of secondary services, such as stainless steel passivation, electroplating, and stress relief heat treatment.
Customized spring design service
Our internal engineering and design departments can provide design assistance and validate existing spring designs. We accept compression spring designs in various file formats, including DWF, DWG, DXF, FBX, JPG, PRT, SAT, TIF, STP, and PDF. We also provide prototype development services to our clients for product evaluation before actual production.

Types of compression springs
The most widely used form of compression spring is the straight cylindrical spring made form round wire, although square or rectangular wire is also used. Anyway, many other forms are produced such as conical or tapered, barrel or convex, hourglass or concave, variable pitch…. Compression springs are linear and thus have the same rate per inch throughout the entire spring.

Such configurations are used to reduce solid height, buckling and surging or to produce nonlinear load deflection characteristics. Energy storage is greater for rectangular wire compression springs, also called “die springs”, however round wire rates can be increased if springs are nested inside one another. Rectangular wire is used to reduce solid height or increase the space efficiency of the design.

Compression springs characteristics
Regarding compression spring ends, they are usually closed and square and these ends can also be closed and ground or have open ends so, the four main end configurations are closed and squared, closed and ground, open and double closed ends. Furthermore a compression spring can have hooks on one or both ends so as to fasten it to a particular assembly. The ends can also be close wound for a certain number of coils on the ends permitting the spring to remain in a vertical position. Furthermore, compression springs can have dual diameters as well as triple diameters for achieving different assembly situations.

A compression spring can be wound in either a left hand or right hand direction, similar to a screw type thread. In applications such as one spring operating inside another, it is necessary to coil the springs so that the helices are in opposite directions, right and left. If a spring screws onto a thread, the direction of the helix should match that of the thread.