Compression springs, often simply called “compression coils,” have various classifications and design considerations. Their performance can be affected by factors such as material, shape, and end treatment. The primary classification is generally based on spring geometry:

1. Cylindrical Compression Springs:
   The most common standard type, featuring a consistent outer diameter from top to bottom.
2. Conical (Tapered) Compression Springs:
   These can compress to a shorter solid height because the coils can nest without overlapping. They are suitable for limited-space applications with fixed height requirements and provide a variable spring rate.
3. Barrel-Shaped Compression Springs:
   Featuring a convex center resembling an olive shape, these springs are mainly used to reduce resonance, save space, improve stability, and minimize lateral buckling.
4. Double Conical (Hourglass-Shaped) Compression Springs:
   Funnel-like in appearance, these springs offer excellent vibration resistance and are commonly used in dynamic environments.
5. Custom-Shaped Compression Springs:
   These springs have non-standard geometries, varying outer diameters, pitches, or functional designs. They are not necessarily cylindrical and may also be manufactured using flat wire materials.
6. Variable Pitch Compression Springs:
   The spacing between coils is unequal, enabling progressive spring resistance during compression.

The following parameters are essential in compression spring design:

• Wire Diameter – Diameter of the spring wire
• Outer Diameter (OD) – Maximum outside diameter of the spring
• Inner Diameter (ID) – Minimum inside diameter of the spring
• Number of Coils
• Free Length – Original unloaded height of the spring
• Working Height – Height under operating compression
• Load – Force generated when compressed to the working height

Each of these dimensions affects the fatigue life and durability of the compression spring.

In some cases, customers may require ground spring ends for improved performance:

• Both ends ground flat to enhance stability and prevent tilting under load.
• Partially ground or standard closed ends offer lower manufacturing cost and are suitable for applications where strict perpendicularity is not required.

Common types of springs include compression springs, extension springs, torsion springs, bent wire forms, custom-shaped springs, wave springs, spiral springs, retaining rings, and leaf springs.

• First, select the spring type that best suits your assembly application.
• Choose the material: SUS304, SUS301, SUS316, SUS631, SWP, SWC, phosphor bronze wire, nickel-plated wire, silicon chrome alloy steel, oil-tempered wire, etc.
• What load does it need to bear?
  (How much force is required during compression, extension, or torsion within the working stroke?)
• What is the allowable working stroke?
  (Compression stroke, extension stroke, or torsion angle range.)
  The distance from the spring’s free length to its maximum compressed or extended length.
• Are there any space limitations?
  (Wire diameter, outer diameter, length, number of coils, angle, etc.)
• What is the required cycle life?
  (Fatigue resistance / number of operating cycles.)
• What are the environmental conditions?
  (Temperature, humidity, corrosion resistance requirements, etc.)

A spring is a component that can store mechanical energy and generate a restoring force. It is widely used in machinery, electronic components, automotive and motorcycle parts, industrial automation, automotive hardware, bicycle components, and peripheral computer spring hardware.

Main Functions:

• Absorbing or cushioning impacts

• Providing support or positioning

• Storing energy

• Controlling motion or return

The material, shape, size, and manufacturing process of a spring affect its elasticity, durability, and suitability for various applications.

Common Materials:

• SWP music wire

• SWC carbon steel

• Stainless steel (SUS304 / SUS316 / SUS631)

• Silicon-chromium alloy steel

• Phosphor bronze wire

• Beryllium copper wire

Common Spring Types:

Compression Springs, Extension Springs, Torsion Springs, Formed Wire Springs, Retaining Rings, Spring Pins, Wave Springs, and Spiral Springs.

Customized solutions are available based on customer requirements, covering the entire process from product design, material selection, prototyping and testing to mass production and delivery. We maintain a complete manufacturing process and strict quality control system. Common materials include carbon steel, stainless steel (SUS 304 / 316), alloy steel, and copper alloys. Heat treatment and surface finishing can be applied according to specific application needs.

JS places great emphasis on quality management and delivery reliability. We continuously improve our manufacturing technologies to provide customers with stable product quality and comprehensive service.

Stainless Steel Springs are springs made from stainless steel materials, offering excellent corrosion resistance, rust resistance, and high-temperature performance. Compared to ordinary carbon steel springs, stainless steel springs provide longer service life and greater stability in humid, outdoor, alkaline, acidic, or chemical environments, making them highly favored in industrial applications.

Key Features and Advantages of Stainless Steel Springs:

1. Corrosion and Oxidation Resistance: Suitable for contact with moisture, oil, or chemicals.

2. Rust Resistance: Ideal for outdoor environments or long-term use.

3. High-Temperature Resistance: Different grades can withstand temperatures from 200°C to 400°C.

4. Stable Mechanical Strength: Resistant to fatigue and deformation during prolonged use.

5. Low Maintenance Cost: Long service life and high reliability.

Common Stainless Steel Materials:

• SUS304: Excellent corrosion resistance, heat resistance up to 200–250°C, widely used in general industrial equipment.

• SUS301: Higher tensile strength than SUS304, good ductility, and strong elasticity; suitable for applications requiring higher strength springs.

• SUS316: Superior corrosion resistance compared to SUS304; ideal for chemical, coastal, or highly corrosive environments, commonly used in food, medical, and marine equipment.

• SUS631 (17-7PH): High hardness and strength; can undergo precipitation hardening (PH) to improve performance; used in high-end industrial components, precision mechanisms, and aerospace parts.

Common Types of Stainless Steel Springs:

      Compression Springs/Extension Springs/Torsion Springs/Wave Springs/Conical Springs/Spring Clips

A swivel hook extension spring is a type of tension spring equipped with rotating or adjustable hooks at both ends.
This design allows the hooks to rotate freely, preventing the spring from twisting during extension and enabling easier alignment during installation.
Even when the pulling direction changes, it maintains stable and smooth tension performance.
Swivel hook extension springs are widely used in mechanical devices, precision instruments, automotive components, and industrial applications that require flexible connections and adjustable tension.

Features:

1. Hooks can rotate or adjust angles for greater flexibility.

2. Prevents torsional stress on the spring body.

3. Improves service life and installation accuracy.

4. Suitable for multi-directional tension and space-limited applications.

A Wave Spring is a type of compression spring made from flat wire that is coiled into a series of waves or curves. It provides the same force and deflection as a conventional round-wire compression spring but in a smaller axial space, making it ideal for compact designs.

Wave springs are widely used in precision mechanical assemblies, where space efficiency, weight reduction, and stable load performance are critical. They offer excellent elasticity, low working height, and consistent load characteristics.

Key Features:

1. Compact design: reduces spring height by up to 50% compared with standard coil springs.

2. Lightweight and cost-efficient alternative for confined spaces.

3. Precise and stable load-deflection performance.

4. Manufactured from stainless steel, carbon steel, or Inconel for corrosion and heat resistance.

A Magazine Compression Spring is a type of compression spring specially designed for use inside firearm or toy gun magazines. It provides the upward force needed to push cartridges or pellets into the chamber. Unlike standard cylindrical compression springs, magazine springs often have a rectangular or oval shape to fit within the narrow magazine housing.

These springs are typically made from high-carbon steel wire, stainless steel (SUS304), or music wire (SWP) to ensure durability, high elasticity, and resistance to deformation after repeated compression.

A Spiral Spring, also known as a spiral torsion spring or clock spring, is made from a flat strip of metal wound in a spiral shape. It stores and releases rotational energy through the elastic deformation of the material. When the spring is wound, energy is stored, and when released, it provides a rotational restoring force.

Spiral springs are commonly used in applications requiring rotational torque or constant force within a limited space. They are valued for their compact design, stable torque output, and long fatigue life.

A compression spring is one of the most common types of springs, mainly designed to withstand compressive forces. When an external load is applied, the spring shortens as it is compressed; when the load is removed, it returns to its original shape and releases the stored energy.
Its primary functions are to absorb vibration, cushion impact, and provide restoring force.

Types of Compression Springs

1. Cylindrical Compression Spring – The most common type with uniform pitch and stable force characteristics.

2. Conical Compression Spring – Narrow at the top and wide at the bottom; can telescope into itself to save space.

3. Barrel Compression Spring – Larger in the middle and smaller at both ends to prevent buckling.

4. Hourglass Compression Spring – Smaller in the middle and larger at both ends; often used where stable positioning is required.

5. Magazine Compression Spring – Rectangular in shape, commonly used in toy guns or magazines to push pellets or bullets upward.

6. Custom Compression Spring – Springs with special shapes, irregular diameters, or non-uniform coil spacing, designed for unique applications.

Applications of Compression Springs

1. Automotive Components: Suspension systems, clutches, and brake assemblies.

2. Electronic Devices: Buttons, battery contact springs.

3. Machinery and Equipment: Shock absorption, return mechanisms.

4. Medical Devices: Surgical instruments, injection systems.

A Spring Factory is a professional manufacturer specializing in the design, production, and processing of various types of springs. Through precise coiling, heat treatment, grinding, and surface finishing techniques, the factory produces a wide range of springs — including compression springs, extension springs, torsion springs, spiral springs, battery springs, and wire forms — to meet the diverse needs of different industries.

Key capabilities include:

1.Customized Design – Developing springs based on customer drawings, functions, or specific application requirements.

2.Material Selection – Utilizing materials such as piano wire, SUS304, phosphor bronze, and INCONEL alloys.

3.Quality Control – Ensuring stability and durability through precise measurement and fatigue testing.

4.Surface Treatment – Offering zinc, nickel, and gold plating, painting, and passivation to enhance corrosion resistance and appearance.

Modern spring factories serve a wide range of industries, including automotive, electronics, medical devices, industrial machinery, home appliances, and aerospace — providing reliable elastic support and precision mechanical performance.

A Custom Battery Spring is designed for specific applications or customized requirements. Compared with standard battery springs, special types can be tailored based on product structure, current capacity, conductivity, or installation method.

The design may include unique shapes (such as dual-contact, flat-wire, or clip-type structures), special materials (like phosphor bronze, stainless steel, nickel alloys, or INCONEL), and surface treatments (such as gold, silver, or nickel plating) to enhance conductivity, corrosion resistance, and durability.

Special battery springs are widely used in medical devices, precision electronics, communication equipment, military instruments, and high-end industrial products.

Precision Springs / Micro Springs

Precision Springs and Micro Springs are elastic components designed to meet the requirements of high precision, compact size, and high reliability. Through precision forming processes and strict quality control, they provide stable spring force, excellent dimensional accuracy, and long-term durability. They are widely used in electronic products, medical devices, communication equipment, automotive electronics, precision instruments, and industrial automation systems.

Depending on different application requirements, they can be manufactured as compression springs, extension springs, torsion springs, custom-shaped springs, and various precision wire-formed components to meet the design requirements of precision mechanisms.

Features and Advantages of Precision Springs / Micro Springs

1. High Dimensional Accuracy

Manufactured using precision processing equipment with strict dimensional tolerance control to meet the requirements of high-precision applications.

2. Stable Elastic Performance

Provides excellent elastic recovery and consistent spring force output, maintaining reliable performance over long periods of operation.

3. Compact and Miniature Design

Capable of producing extremely fine wire diameters and miniature spring designs, making them suitable for space-limited and miniaturized products.

4. Excellent Fatigue Resistance

Manufactured using high-quality spring materials, these springs can withstand long-term repeated compression, extension, or torsion cycles, extending product service life.

5. Customized Design Capability

Available with customized materials, wire diameters, dimensions, spring forces, and surface treatments to meet various special application requirements.

Common materials include stainless steel, phosphor bronze, and specialty alloys such as Inconel or Elgiloy, with optional heat treatment or surface plating to enhance conductivity, corrosion resistance, and durability.

A battery spring is a metal elastic component specifically designed for battery contact and retention. It is commonly used in products that require battery replacement, such as remote controls, flashlights, toys, medical devices, power tools, and measuring instruments.