Extension Spring Manufacturers
Extension springs are mechanical devices that store energy and offer resistance when subjected to external forces. Extension springs work by resisting a load which stretches the spring and makes the spring longer. They are attached at both ends to other components and as the components move apart, the spring pulls them back together. Learn more about extension springs.
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Lee Spring Company (Brooklyn, NY)
Manufacturer, Contract Manufacturer www.leespring.com/extension_spec.asp?springType=E&forWhat=Se… Lee Spring offers both Stock Extension springs and custom extension springs capabilities. Lee Spring's Stock Extension Springs are supplied with full diameter loops (machine or crossover center) at a random position. Loop openings are approximately one wire diameter and the direction of wind is optional. Custom Extension Springs can be made to specification. 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. Another common type of extension spring is the drawbar spring. Primarily Serving: New York, NY - Jersey City, NJ - Bayonne, NJ - Union City, NJ |
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James Spring & Wire Company (Frazer, PA)
Manufacturer Custom Extension Springs: Wire size: 0.006" to 0.250" wire size |
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HyTech Spring and Machine Corp. (Plainwell, MI)
Contract Manufacturer HyTech produces extension springs for a variety of applications from material sizes ranging from .002" - .177" (0.05mm - 4.5mm). End configurations of any type are available including full and double loop, German, and English hooks. Our precision CNC equipment allows us to maintain tight tolerances on both physical dimensions and force requirements. Primarily Serving: Kalamazoo, MI - Battle Creek, MI - Wyoming, MI - Grand Rapids, MI |
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The D.R. Templeman Co. (Plainville, CT)
Manufacturer, Contract Manufacturer Manufacturer of precision extension springs complete per your specifications for industrial, medical and consumer products. All spring materials. Wire sizes from 0.004" [0.1mm] to 0.080" [2.0mm]. On-line stock extension spring catalog for immediate delivery. Expert engineering assistance available. Primarily Serving: New Britain, CT - Bristol, CT - West Hartford, CT - Meriden, CT |
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Diamond Wire Spring Company (Glenshaw, PA)
Manufacturer, Contract Manufacturer www.diamondwire.com/extension_form.aspx While many applications require springs that dampen force and perform a pushing action, others require springs that oppose extension by pulling themselves back together. We stock extension spring as well as custom manufacture to your spec. Primarily Serving: Pittsburgh, PA - Youngstown, OH - Canton, OH - Akron, OH |
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AMMTECH Spring Ltd (Richmond, BC)
Manufacturer, Contract Manufacturer, Service Company As leading Spring Manufacturers, we are very proud of our experienced staff that strive to ensure that the products we ship meet or beat industry standard & our lead times are kept short & on time; much of our work is done in 1-1/2 weeks or less. |
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Mercer Spring & Wire Co (Townville, PA)
Manufacturer, Contract Manufacturer Extension spring designs generally follow that of compression springs, however consideration must be given to the effects of the end turns. A wide variety of shapes of end turns are used in the manufac-ture of extension springs, depending upon the use of the spring. It is advisable to avoid sharp bends in the end hooks, to reduce stress concentration. Primarily Serving: Erie, PA - Youngstown, OH - Mentor, OH - Pittsburgh, PA |
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Peterson Spring (Southfield, MI)
Manufacturer www.pspring.com/Extensionsprings Helical extension springs store energy and exert a pulling force. Extension springs differ from compression springs in that they do not have a solid stop to prevent overloading. For this reason, they are designed with lower stress levels. Typical applications include balance scales, trampolines, garage doors, dock levelers, farm machinery and various types of spring tensioning devices. Primarily Serving: Royal Oak, MI - Farmington, MI - Livonia, MI - Troy, MI |
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Spring Manufacturing Corp Inc (Tewksbury, MA)
Manufacturer www.springmancorp.com/extension.htm Extension springs are helical springs designed to store energy and resist a pulling force. We have a few examples of extension springs shown below. With years of experience assisting in the design and manufacture of precision springs, we are always available to help meet your challenge. Contact us today to get us on board for your next project. Primarily Serving: Lowell, MA - Lawrence, MA - Haverhill, MA - Medford, MA |
| Dependable Spring Company (Oregon City, OR)
Contract Manufacturer Extension springs are used when there is a pulling force involved. Loops or hooks are used on the ends to ensure a secure hold. With our full looping capabilities cost and lead time is reduced without the need of secondary operations. Electronic probes and sensors on machines ensure tolerances and loop positions are to print specification. At no extra cost to the customer we can provide: - Technical specifications at your request (i.e. tolerances for critical dimensions, proper size and type of material, etc.) - SPC data on production runs. - Design support and problem solving to ensure functionality of product at the most effective cost. Primarily Serving: Clackamas, OR - Gresham, OR - Portland, OR - Beaverton, OR |
| AmeriSprings Inc. (Philadelphia, PA)
Manufacturer Amerispring develops custom helical extension springs as you need them, including a wide range of end hooks, full twist loops and other configurations. Prototypes are individually made to customer specifications. These critical components vary in size, shape, end configuration and assembly complexity. Helical extension springs store energy and exert a pulling force. Usually they are made from round wire and are close-wound with initial tension. Primarily Serving: Camden, NJ - Levittown, PA - Wilmington, DE - Trenton, NJ |
| Draco Spring Mfg Co (Houston, TX)
Manufacturer With flexible machinery and millions of dollars in raw materials, Draco is unmatched in it's ability to deliver short run, rush orders. Draco has been designing and manufacturing springs, wire forms and stampings for 40 years. Draco is equipped to produce custom or production orders from round, flat, or square materials. Primarily Serving: Pasadena, TX - Missouri City, TX - Sugar Land, TX - League City, TX |
| Timac Spring Manufacturing Co. (Xenia, OH)
Manufacturer We can produce small orders or prototypes from 0.006" diameter wire to 0.406" diameter wire and foil to 0.125" thick strip stock. For those large quantity jobs we have state of the art CNC spring and wire forming equipment with automated gauging. Primarily Serving: Dayton, OH - Springfield, OH - Middletown, OH - Hamilton, OH |
| John While Springs (S) Pte Ltd (Singapore, Singapore)
Manufacturer Compression Springs, Extension Springs - John While Springs, Singapore. Manufacturer of Compression Springs, Extension Springs, Torsion Springs, Spiral Torsion Springs, Flat Springs, Wire Forms. Customised Springs, Products, Quotations, including Compression Springs, Extension Springs. ISO Standard |
| Spring Works Utah (Woods Cross, UT)
Manufacturer If you would like free design assistance, (RFQ) request for quote, or would like to speak with one of our representatives about your extension spring project, please Contact Us. Ph: 801.298.0113 Fx: 801.292.8006 sales@springworksutah.com Primarily Serving: Salt Lake City, UT - Layton, UT - West Jordan, UT - Sandy, UT |
| Elyria Spring & Specialty Inc. (Elyria, OH)
Manufacturer Extensive capabilities in compression, torsion, extension, flat springs and wave washers in various materials such as stainless steel alloys, music wire, phosphorus bronze, oil tempered wire in both round and shaped forms. Primarily Serving: Lorain, OH - Lakewood, OH - Cleveland, OH - Cuyahoga Falls, OH |
| Hardware Products Company (Chelsea, MA)
Manufacturer When it comes to extension springs, the most demanding companies come to rely on Hardware Products. Find your springs on our online catalog or contact us about our special SpringLink Program Primarily Serving: Revere, MA - Malden, MA - Boston, MA - Somerville, MA |
| Fox Valley Spring Co., Inc. (Greenville, WI)
Manufacturer We have 13 automated spring coilers, 5 of which are computer-controlled, allowing us to manufacture complex springs in one operation. We are committed to continually invest in the latest technologies. Primarily Serving: Appleton, WI - Oshkosh, WI - Green Bay, WI - Waukesha, WI |
| PJ SPRING CO., INC. (West Chicago, IL)
Manufacturer, Contract Manufacturer Types of ends include Machine Half and Full loops, Full loops over center or on the side, Double twisted, Crossover Swivel, or Extended loops to specifications. (Wire size: Min.=0.010" Max.=0.312") Primarily Serving: Wheaton, IL - Naperville, IL - Aurora, IL - Elgin, IL |
| Economy Spring & Stamping Co. (Southington, CT)
Manufacturer We provide advanced quality planning and economical production through skilled engineering, precision equipment and conformance to customer requirements. We manufacture extension springs, extrusion springs, torsion springs, and wire forms! Primarily Serving: Meriden, CT - Bristol, CT - New Britain, CT - Waterbury, CT |
| MSDivisions (Middletown, NY)
Manufacturer, Contract Manufacturer MSDivisions manufactures stock and custom springs, including the usual extension, torsion, and compression, with wire diameters from .006 and up. Stock and custom metric springs too. Primarily Serving: Wayne, NJ - Paterson, NJ - Clifton, NJ - Passaic, NJ |
| Multi-Form Spring Mfg Ltd (Richmond, BC)
Manufacturer Our springs include: Compression, Extension, Torsion, Double Torsion, Carter Springs. We can produce springs ranging from one piece to multi production orders to customer specifications. |
| Hangzhou Jiangnan Spring Co., Ltd (Hangzhou, China)
Manufacturer Extension springs, springs that rest in the closed or shorter position, are used in all types of industry: agricultural, industrial, military, transportation, and more. |
| Automatic Spring Products Corp. (Grand Haven, MI)
Manufacturer Compression Springs, Extension Springs, & Torsion Coiling: ASPC can manufacture precision compression and extension springs. We manufacture precision torsion springs and wire forms. Primarily Serving: Wyoming, MI - Grand Rapids, MI - Kalamazoo, MI - Battle Creek, MI |
| Tollman Spring Co., Inc. (Bristol, CT)
Manufacturer Tollman Spring manufactures a wide variety of compression, extension and torsion springs to meet the exact specifications of our customers. Primarily Serving: New Britain, CT - Waterbury, CT - West Hartford, CT - Meriden, CT |
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About Extension Springs
Springs are mechanical components that have mechanical energy stored in them, capable of undergoing structural changes when subjected to external forces.
Springs are available in many types. Some important types of springs are: leaf springs, compression springs, disc springs, snap springs, torsion springs, etc. Extension springs work by resisting a load which stretches the spring and makes the spring longer. Extension springs are attached at both ends to other components and as the components move apart, the spring pulls them back together. 
The space available in a product determines the dimensions of the spring. Extension springs have a wide variety of attachments such as hooks, threaded inserts, extended twist loops, crossover center loops, expanded eyes, reduced eyes, rectangular ends and teardrop shaped ends. Extension springs are wound to oppose extension. They are often tightly wound in the no load position and are frequently used to provide return force to components that extend in the actuated position.
One 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 used when supporting a porch swing.
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. The outer diameter, inner diameter, wire diameter, length inside the ends, and body length are the important dimensions that must be considered.
Formulas for Extension Springs:
- TF = Total Force exerted on spring
- D = Distance spring is deflected
- IT = Initial tension force on spring
- Rate = The load (pounds) required to deflect (stretch) the spring one theoretical inch.
- D = Mean diameter, (O.D.-d) inches
- d = Wire diameter, inches
- G = Modulus (spring steel = 11.5x106, stainless 10x106)
- K = Stress correction factor
- n = Number of coils
- P = Applied load, Lbs.
- R = Rate (constant), Lbs/In.
- S = Body wire stress, psi
- Δ (Delta) = Deflection (stretch) due to load, inches
- π (pi) = 3.14159
- Si = Stress due to Initial Tension
Materials used for Fabricating Extension Springs:
Alloys of steel are used to manufacture most types of springs. Some of the most common types of spring steels are oil tempered wire, chrome silicon, chrome vanadium, 302 and 17-7 stainless. Depending on the characteristics and need of the applications a few other materials are also used to fabricate springs. Beryllium copper, phosphor bronze, Inconel, Monel, and titanium are some of the other materials used to make springs.
Applications:
As examples of their use, extension springs are found in automotive assemblies, garage doors, tools, machinery, toys and appliances. Extension springs come in a wide variety of sizes and strengths.
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