EXTENSION SPRINGS
MWS DELIVERS—LARGE OR SMALL, SIMPLE OR COMPLEX
Premier Custom Springs
As a premier custom springs manufacturer, we choose from a variety of materials, types, and shapes to craft extension springs to meet your application’s needs. Allow us to review your specifications and offer you a competitive quote.
Examples range from large snowplow springs and utility truck tarp springs to small cabinet door springs.
CAPABILITIES
- .007″ – .750″ wire size
- Various wire materials
- Selection of wire shapes – round, rectangular, square
- Wire types include round, rectangular, square, & special-section wire
- Wide variety of end configurations
- Machine hook
- Swivel hook
- Extension hook
- Additional options
- Secondary processes and finishes
- Engineering assistance with spring designs
YOUR DESIGN, OUR QUALITY
CUSTOM EXTENSION SPRINGS ENSURE FIT AND FUNCTION FOR YOUR UNIQUE APPLICATIONS.
RAPID RESPONSE RFQ
Submit an RFQ and MWS will review your specifications. Our team will recommend options to help control costs while retaining quality and precision, noting exceptions, if any, directly on your quote to flag concerns or suggest modifications.
HIGH CARBON WIRE
High carbon spring steels are the most commonly used of all materials. Try to use these materials in preference to others because they are least expensive, readily available, easy worked, and most popular. These materials are not satisfactory for high or low temperatures or for shock or impact loading.
| Material | Method of Manufacture • Chief Uses • Special Properties |
|---|---|
| Music Wire ATSM 228 |
Cold drawn. High and uniform Tensile. High quality springs and wire forms. |
|
Hard Drawn
ATSM A 227 |
Cold drawn. Average stress applications. Lower cost springs and wire forms. |
| High Tensile Hard Drawn ATSM A 679 |
Cold drawn. Higher quality springs and wire forms. |
| Oil Tempered ATSM A 229 |
Cold drawn and heat treated before fabrication. General purpose spring wire. |
| Carbon Valve ATSM A 230 |
Cold drawn and heat treated before fabrication. Good surface condition and uniform tensile. |
ALLOY STEEL WIRE
The alloy spring steels have a definite place in the field of spring materials. Try to use these materials, particularly for conditions involving high stress and for applications where shock or impact loading occurs. Alloy spring steels can also withstand higher and lower temperatures than the high-carbon steels and are obtainable in either the annealed or pre-tempered conditions.
| Material | Method of Manufacture • Chief Uses • Special Properties |
|---|---|
| Chrome Vanadium Chrome Vanadium |
Cold drawn and heat treated before fabrication. Used for shock loads and moderately elevated temperatures. |
| Chrome Silicon ASTM A401 |
Cold drawn and heat treated before fabrication. Used for shock loads and moderately elevated temperatures. (Mid-West Spring recommends that Chrome Silicon never be electro-plated.) |
STAINLESS STEEL WIRE
The use of stainless steels has increased considerably in recent years. Several new compositions are now available to withstand corrosion. All of these materials can be used for high temperatures up to 650° F.
| Material | Method of Manufacture • Chief Uses • Special Properties |
|---|---|
| ASI 302-304 ATSM 313 |
Cold drawn. General purpose corrosion and heat resistant. Magnetic in spring temper. |
| ASI 316 ASTM A313 |
Cold drawn. Heat resistant and better corrosion resistant than 302. Magnetic in spring temper. |
| 17-7 PH ASTM A313 (631) |
Cold drawn & precipitation hardened after fabrication. High strength and general purpose corrosion resistance. Slightly magnetic in spring temper. |
NON-FERROUS ALLOY WIRE
Copper-based alloys are important spring materials because of their good electrical properties combined with their excellent resistance to corrosion. Although these materials are more expensive than the high-carbon and alloy steels, they nevertheless are frequently used in electrical components and in subzero temperatures. All copperbased alloys are drawn to the American wire gage (same as Brown & Sharpe gage) and are magnetic.
| Material | Method of Manufacture • Chief Uses • Special Properties |
|---|---|
| Phosphor Bronze Grade A ASTM B159 |
Cold drawn. Good corrosion resistance and for electrical conductivity. |
| Beryllium Cooper ASTM B197 |
Cold drawn and may be mill hardened before fabrication, good corrosion resistance and electrical conductivity. High physicals. |
| Monel 400 AMS 7233 |
Cold drawn. Good corrosion resistance at moderately elevated temperatures. |
| Monel K500 QQ-N-286 |
Excellent corrosion resistance at moderately elevated temperatures. |
HIGH TEMPERATURE ALLOY WIRE
Nickel-based alloys are especially useful spring materials to combat corrosion and to withstand both elevated and below-zero temperature applications. Their magnetic characteristics are important for such devices as gyroscopes, chronoscopes and indicating instruments. These materials have high electrical resistance and should not be used for conductors of electric current.
| Material | Method of Manufacture • Chief Uses • Special Properties |
|---|---|
| A286 Alloy | Cold drawn & precipitation hardened after fabrication. Good corrosion resistance at elevated temperatures. |
| Inconel 600 QQ-W-390 |
Cold drawn. Good corrosion resistance at elevated temperatures. |
| Iconel 718 | Cold drawn & precipitation hardened after fabrication. Good corrosion resistance at elevated temperatures. |
| Iconel X-750 AMS 5698, 5699 |
Cold drawn & precipitation hardened after fabrication. Good corrosion resistance at elevated temperatures. |
FLAT HIGH-CARBON SPRING STEELS
Flat high-carbon Spring Steels General. Although several types of thin flat strip are available for specific applications in watches, clocks and certain instruments only two types are readily available. These two compositions are used for over 95% of all applications requiring flat high-carbon strip. Although these materials are frequently plated, sections under 0.015 in. having carbon content over 0.85 with hardness over Rockwell C47 are highly susceptible to hydrogen-embrittlement even though special plating and heating operations are employed.
Some important factors to consider when ordering your custom extension springs:
End style
Extension spring diameter – O.D. maximum, I.D. minimum
Extension spring rate – What is the load in pounds per inch required to extend the spring?
Length of inside hooks
Load fully extended – For a specific application, you will need to know the total load at the maximum extended length.
Total number of coils
Winding direction – THE DIRECTION OF THE COIL is the right-hand or left-hand winding. Handedness is important in very few applications.
Wire diameter – We can produce an extension spring in diameters from .007″ to .625″ round, up to .375″ square and rectangular to specifications.
Wire material – We can furnish extension springs in most metals and alloys.
To expedite the RFQ process, choose the option that applies to you:
I have a blueprint or specifications sheet to upload with my request.