Your Professional Compression Springs Supplier
Zhuji Xuanyu Spring Co., Ltd. (formerly Zhuji Printing Machine Spring Factory) is a high-quality spring manufacturer with 28 years of professional experience, recognized as a pioneer and leader in China’s printing press and die-cutting machine industries. We are consistently dedicated to providing exceptional spring solutions for our clients.
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Why choose us
Quality Control
We maintain a strict internal inspection process. Each batch of products undergoes multiple tests, including accuracy, pressure resistance, and service life. Key inspection data can be provided upon request.
Logistics Solutions
With extensive export experience, we can arrange sea freight or international express delivery (DHL, FedEx, etc.) and offer trade terms such as FOB Ningbo/Shanghai to ensure safe and efficient delivery.
Sales Market
We have established stable supply partnerships in Southeast Asia, Europe, North America, and the Middle East, and we have served customers from countries such as Germany, Japan, the United States, and India for many years.
Our Service
From order placement to shipment, we maintain close communication. You can track order progress at any time, and we can provide photos or videos of key production stages upon request, allowing you to monitor quality remotely.
Key Compression Spring Parameters
Rate: Spring rate is the change in load per unit deflection in pounds per inch (lbs/in) or Newtons per millimeter (N/mm).
Stress: The dimensions, along with the load and deflection requirements, determine the stresses in the spring. When a compression spring is loaded, the coiled wire is stressed in torsion. The stress is greatest at the surface of the wire; as the spring is deflected, the load varies, causing a range of operating stress. Stress and stress range govern the life of the spring. The wider the operating stress range, the lower the maximum stress must be to obtain comparable life. Relatively high stresses may be used when the operating stress range is narrow or if the spring is subjected to static loads only.
Outside Diameter: The diameter of the cylindrical envelope formed by the outside surface of the coils of a spring.
Hole Diameter: This is a measurement of the space where you would insert a compression spring. It is the diameter of a mating part to a compression spring and often commonly mistaken for a dimension of the spring itself. The hole diameter should be designed larger than your compression spring’s outside diameter factoring tolerance and spring expansion under load.
Rod Diameter: This is a measurement of the rod that goes through the inside of a compression spring. Essentially a mating part, this rod can work as a guide shaft to minimize spring buckling under load. The rod diameter should be designed smaller than your compression spring’s inside diameter factoring tolerance; however, not too small or else it loses ability to minimize spring buckling.
Free Length: The length of a spring when it is not loaded. NOTE: In the case of extension springs, this may include the anchor ends.
Wire Diameter: This is a size measurement of the raw material used to form a spring. Conventional springs are made with round wires that are specified to a diameter.
Solid Height: This is a length dimension of a compression spring at its maximum loaded condition. Effectively, this is the compression spring’s height when all the coils are pressed together.
Spring Set: This is an occurrence when a spring is loaded beyond its material elastic strength. It is a kind of permanent deformation that is noticeable when a spring does not return to its original length after releasing a deflection load. Depending on the application, spring set can be either desirable or undesirable.
Load at Solid Height: This is a measurement of the force required to completely deflect a compression spring to where the coils are fully pressed together. For product designers that want to avoid the occurrence of bottoming out a compression spring, Load at Solid Height is quick reference property to find springs capable of handling an assembly’s maximum operating load.
The types of compression springs available include
Convex springs
Convex springs (i.e., barrel-shaped springs) have coils with larger diameters in the middle of the spring and coils with smaller diameters on both ends. This design allows the coils to fit within each other when the spring is compressed. Manufacturers use convex springs in applications that require more stability and resistance to surging as the springs decompress. Most applications that use them are in the automotive, furniture, and toy industries.
Conical springs
Conical springs (i.e., tapered springs) are shaped like cones. One end has a larger diameter than the other, and the coils throughout the spring provide a gradual taper or change in size. Some conical springs have enough change in diameter from coil to coil so that each coil fits into the previous one.
Concave springs
Concave springs (i.e., hourglass springs) have narrower coils in the middle of the spring than on either end. The symmetrical shape helps ensure the springs stay centered over a particular point.
Straight coil springs
In these springs, every coil has the same diameter. Straight coils are some of the most common springs in use.
Variable pitch springs
Variable pitch springs have different distances between each coil up and down the length of the spring.
Volute springs
These springs are cone-shaped. However, instead of having wire coils, the coils are formed from a curled sheet of metal or other material.
Compression Springs are open-coil helical springs wound or created to oppose compression along the axis of wind. Helical Compression is the most typical steel springtime arrangement. These coil springs can function individually, though commonly assembled over a guide rod or equipped inside an opening.
Product Description
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Wire Diameter |
0.1 to 18mm |
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Material |
Stainless steel, Carbon steel,music wire/piano wire,Beryllium copper, Brass, Alloy steel,etc. |
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Surface Treatment |
Zinc-plated, nickel-plated, chrome-plated, gold-plated, Imitation gold-plated, Tin, Powder coating, Oxide black or customized, etc. |
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Main Products |
Compression Spring, Extension Spring, Torsion Spring, Wire Forming Spring, Stamping Parts and so on. |
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Packing |
Inner packing with plastic bags, and then carton boxes for the outer packing, and then the wooden or plastic pallets for request. |
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Produce Equipment |
Advanced CNC Spring machinery; Advanced grinding and short blasting machinery; Precise tensile strength testers, compression testers, endurance testers, magnetic powder flaw detectors. |
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Test Equipment |
Projectors; Digital hardness tester; Digital torsion strength tester; Digital compression and torsion strength tester; Elasticity tester; Life tester; Salt spray test machine etc. |
Materials Used to Make Compression Springs
Stainless Steel
Highly valued in spring manufacturing for its excellent corrosion resistance and ability to withstand exposure to moisture, chemicals, and extreme temperatures. Stainless steel compression springs are widely used in food processing, medical devices, and marine applications.
Music Wire
Made from high-carbon steel, music wire is known for its exceptional tensile strength, elasticity, and ability to handle high-stress, repeated load cycles. It is frequently chosen for demanding applications, such as automotive suspension, gym equipment, industrial machinery, and precision electronics, offering a modulus of elasticity around 30,000 psi and high minimum tensile strengths (typically 230–399 ksi).
Hard-Drawn Steel Wire
This medium-carbon steel wire is commonly found in lower-cost, lower-stress springs used in household items, stationery, office equipment, and general consumer products. Its varying Rockwell hardness levels (C31–C52) allow for flexible spring customization.
Manufacturing processes for compression springs
Cold winding
The term used when creating a spring using cold material, either annealed or pre-hardened, and performing the required heat treatments and tempering after.
Hot winding
The term used when heating the material for coiling and quenching and tempering the spring after.
Coiling
The spring makers term for making a spring or describing the process of manufacture.
Grinding
When we grind a spring, we are grinding the ends to create a larger load bearing surface and making the ends 90° square to the axis of the spring.
Certificates
FAQ
As one of the most professional compression springs manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale bulk customized compression springs made in China here from our factory. Contact us for more details.
Agricultural Machinery Hydraulic Springs, Coil compression springs, Hydraulic Shock Absorber Springs
