Extension springs absorb and store energy as well as create a resistance to a pulling force. Extension springs are attached at both ends to other components. When these components move apart, the extension spring tries to bring them together again. These springs absorb and store energy as well as create a resistance to a pulling force. It is initial tension that determines how tightly together an extension spring is coiled. This initial tension can be manipulated to achieve the load requirements of a particular application. Extension springs have hooks, eyes, or other interface geometry at the ends to attach to the components they connect. They are frequently used to provide return force to components that extend in the actuated position.
Applications
Applications for extension springs include automotive interiors and exteriors, garage door assemblies, vise-grip pliers, carburetors, trampolines, washing devices, farm machinery, toys as well as thousands of other uses. Extension springs come in a wide array of sizes, from small medical devices to off-road machinery brake springs.
Configurations
Hcyspring Extension spring ends include threaded inserts, extended twist loops, crossover center loops, hooks, expanded eyes, reduced eyes, rectangular ends and teardrop-shaped ends, which can all be produced to vary in distance from the spring body. At the design stage of custom extension springs, the length of the hooks at each end of the spring can be adjusted in order to precisely obtain the required spring load at any extended position.
Continuous Length Extension Springs are designed to be cut to desired length by the user to meet a particular load requirement. Various loops or hooks can be formed on the ends using looping pliers or other appropriate instruments; as wire size increases, use different tools including a vise to hold the coil body and a pry bar to bend up the last coil.
Another common type of extension spring is the drawbar spring. In a drawbar, the load is applied at the ends of long steel loops which pass through the spring’s center and are hooked around the opposite end, thus compressing the spring upon loading. Drawbar springs are excellent for use in potential overload situations and offer a built-in definite stop that will continue to carry a static load after reaching the maximum extended length. A common application of the drawbar spring is to support a porch swing.
We are a manufacturer with over 10000 square meters of factory buildings and more than 100 advanced machines. We guarantee that there are no intermediaries and provide direct and effective services.
2.High quality:
We adopt advanced production technology and strict testing processes to maintain excellent product quality and reliability.
3.Price competitiveness:
We provide high-quality products at more affordable prices to ensure the creation of huge value for our customers.
4.After sales service:
Enjoy our team’s 7*24 hour service support to meet your needs and ensure your satisfaction.
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We can customize products according to customer requirements, including spring specifications, material selection, coating, packaging, etc. Please call me for more information.
E-mail: millyxiang518@gmail.com
WhatsApp：+86 15669508226
Our company’s website: https://hcyspring.com，Stay up-to-date with the latest information at any time.
We’ve compiled answers to the most common questions about our spring hardware products and services to make your experience seamless. Whether you’re inquiring about custom solutions, sample requests, payment options, or delivery details, you’ll find clear guidance here.
If you don’t see what you’re looking for, our team is always ready to assist you personally. Simply reach out via email or live chat – we typically respond within 24 hours.
Thank you for choosing HCY Spring Hardware Accessories Co., Ltd.
We’re committed to making your procurement process smooth and efficient.”
1.Inquiry and Communication (Example)
Q: How can I send you my spring requirements?
A: You can:
WhatsApp: +86 15669508226 (Fast response for urgent inquiries).
Online Form: Fill out the [Request a Quote] form on our website. Tip: Include material, wire diameter, quantity, and application for faster service.
Q: Do you accept customized designs? A: yes! We specialize in customized springs, hardware accessories, and hardware crafts with wire diameters ranging from 0.1mm to 12mm. Please send us your CAD drawings or samples, and our engineers will review the feasibility within 24 hours.
2.Payment Method:
We provide flexible and secure payment solutions for global partners. As a spring hardware manufacturer with 20 years of industry experience, we have established stable cooperative relationships with multiple international financial institutions and can recommend the best payment solution based on your actual situation.
We promise:
✓ All payment channels have passed international security certification
✓ Support multi currency settlement (USD/EUR/GBP, etc.)
HCYSPRING always puts transaction security first, and every payment you make will be strictly protected.
Note: The specific payment terms will be explained in detail by a professional team when confirming the order.
3.Logistics and Timeliness (Example)
Q：How do you ship orders?
A：We optimize costs and speed based on your needs:
(Further communication on specific details)
Q： What is your production delivery cycle?
*A: Standard order: 10-15 days after payment of the down payment.
Urgent service: 7 days (further communication required, exact time depends on the complexity of spring).
4.Sample Policy (Example)
Q：Can I get free samples?
A：yes! We offer:
Free samples: applicable to standard spring hardware products (customer pays for shipping).
Customized samples: If a large order is placed within 60 days, the fee will be refunded.
Apply for samples through email and contact us.
Q： How long does it take for sample delivery?
A： Production cycle of 5-15 days (depending on sample complexity).
5.Quality and after-sales service (example)
Q: What if the products don’t meet specifications? A: We provide:
Pre-shipment photos/videos for approval.
Free replacement if defects are our fault (return shipping covered by us).
Hcysspring offers a comprehensive range of over 18000 inventory springs, and improves spring performance and corrosion resistance through processes such as end grinding, electroplating, and passivation. Hcysspring can provide CAD drawings to assist with your design. We have publicly available pricing for any quantity of springs and offer free ground transportation to help you reduce costs. The following are Hcysspring’s current products, but in order to respond to customer feedback, meet market demand, and expand the company’s production capacity, we will always add new products to the catalog. Please check the latest product catalog at any time to get the latest product items!
1.Round wire compression spring
2.Instrument compression spring (imperial and metric
3.Lite Pressure Micro Pressure Spring (Imperial)
4.Standard compression springs (imperial and metric)
5.Heavy load compression spring (imperial system)
6.Wave spring
7.Disc spring
8.Stretch spring
9.Stretch Spring Standard Parts Series (Imperial and Metric)
10.Twisted spring
11.Battery spring
Match with four types of batteries AA, AAA, C, or D
Materials and post-processing:
Nickel plated piano steel wire
Silver plated beryllium copper
12. Constant force spring
Materials and post-processing:
Stainless steel spring leaf
Note: Hcysspring will provide different customization solutions according to different customization requirements. Please feel free to inquire and leave a message.
Compression Springs are open-coil helical springs wound or constructed to oppose compression along the axis of wind. Helical Compression is the most common metal spring configuration. These coil springs can work independently, though often assembled over a guide rod or fitted inside a hole. When you put a load on a compression coil spring, making it shorter, it pushes back against the load and tries to get back to its original length. Compression springs offer resistance to linear compressing forces (push), and are in fact one of the most efficient energy storage devices available.
The amount of energy stored in a compression spring is determined by the spring’s material properties, wire diameter, and number of coils. The spring’s rate, or stiffness, is determined by the wire diameter and the number of coils. The spring’s rate is the change in force per unit change in length, and it is measured in pounds per inch or newtons per millimeter. The spring’s rate can be adjusted by varying the wire diameter or the number of coils.
Compression Spring Applications
Compression Springs are found in a wide variety of applications ranging from automotive engines and large stamping presses to major appliances and lawn mowers to medical devices, cell phones, electronics and sensitive instrumentation devices. The most basic installation is anywhere requiring a push button. Conical type springs are generally used in applications requiring low solid height and increased resistance to surging.
Stock Compression Springs
Stock Compression Spring Series
Bantam™ Mini Series Free Length: 0.039″ – 0.625″ Ends Not Ground
Instrument Series Free Length: 0.039″ – 2.087″ Ends Square, Not Ground
Lite Pressure™ Series Free Length: 0.313″ – 6″ Ends Square, Not Ground
Standard Series Free Length: 0.173″ – 11.417″ Squared, Ground Ends
Heavy Duty Series Free Length: 0.875″ – 6″ Squared, Ground Ends
High Pressure Series Free Length: 0.250″ – 4″ Squared, Ground Ends
DIN-Plus Series DIN2098 Part 2- Free Length: 0.039″ – 2.063″ Ends Square, Not Ground DIN2098 Part 1: Free Length: 0.173″ – 39.961″ Squared and Ground Ends
HEFTY™ Die Springs Fit in Hole 0.375″ – 2 Free Length
LeeP™ Plastic Composite Series Free Length: 0.375″ – 1.25″ Available in 5 Colors – Coded Strengths
MIL SPEC MS24585 Free Length: 0.250″ – 1.5″ Square and Ground
Custom Compression Springs
Lee Spring offers extensive custom compression spring capabilities and engineering support from design through production. Custom compression springs can be manufactured in a wide range of size and material options. Common compression spring materials include stainless steel, carbon steel, chrome silicon, and music wire.
Lee Spring offers advanced capabilities and a wide variety of options for custom compression spring manufacturing needs such as; advance quality control systems, regulatory expertise including RoHS, REACH and DFARS CAD assisted product design, in-house prototype production services and global supply chain network. Lee Spring is ISO 2015:9001 certified, REACH and RoHS compliant and ITAR Registered.
Lee Spring can manufacture custom compression springs in small or large quantities. Lee Spring can supply for short run R&D projects up to large, long run blanket orders that run over a period of years.
To learn more about material options – click here. To learn more about coatings and surface treatment options – click here.
Custom Compression Spring Quotes Request a custom compression spring quote today or contact a Lee Spring Engineering for design help or to answer any technical questions.
Compression Spring Supply – Global Flexibility
Lee Spring partners with your business to find solutions that meet your geographic requirements wherever your business takes you in the world. Lee Spring has locations locations around the world ready to assist. Develop prototypes with a Lee Spring Engineering in one part of the world and reduce long run shipping costs by producing parts close to where you need them in another part of the world. This level of global flexibility and selection is just another reason to work with Lee Spring on your next project.
Key Parameters
Unit of Measures: Lee Spring’s Stock Springs are specified in both Imperial (inch and pound) and Metric units.
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.
Direction of Wind: Coil compression springs are wound in either a left hand or right hand direction, similar to a screw type thread.
Counting Coils: There are two primary methods of counting coils that apply to springs, active coil count and total coil count.
Ends: There are four primary end type configurations for compression springs. The spring end may be ground or unground, and the end coils may be open or closed coil.
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.
Material: This is the raw material type used to form a spring. Common types include carbon steel, stainless steel, nickel alloys, copper alloys, and cobalt alloys. Your application could guide your material options for a spring. View Materials, Finishes and Plating.
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.
Finish: There are a number of finish and plating options available for springs. The application of the spring will help to determine the best finish and plating options for a specific application. Spring finish may be used to protect or to help identify a spring. Learn more about Materials, Finishes and Plating.
Compression Spring Types & Shapes: Compression springs are manufactured in a variety of shapes. Custom designs may have any number of shapes depending on the application.
Cone shaped compression springs have a spring radius that decreases towards the end of the spring. This is a common shape used for battery springs.
Hour glass compression springs taper tighter towards the center and the outer coils have a larger diameter.
Barrel shape compression springs have a design that is reduced at the ends and wider in the center.
Reduced ends compression springs are straight across the center coils and taper only towards the end coils.
