Plot No 196 Sector No 7 Opposite Arise International School MIDC Bhosari - 411026
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Extension Spring Manufacturing
SHAMA SPRING INDUSTRIES
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Extension Spring Overview
Shama Spring warehouses the largest inventory of high-grade extension springs. Extension springs are designed to 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 your particular application. All Century extension springs are wound with an initial tension force that offers a small deflection load for secure installation “holding”. The initial tension is equal to the minimum force required to separate adjacent coils. .
They are commonly used in various industrial, commercial, and residential applications, ranging from automotive to aerospace, furniture, appliances, and more.
SHAMA SPRING INDUSTRIES
We Manufacture Extension Springs Ranging from WD 0.3mm to 60 mm
Materials
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The highest grades of spring wire are used in manufacturing Shama Spring products. Certifications of conformance for geometric tolerances for our stock springs are available upon request. We only offer material certifications for custom springs.
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“Spring steel” is a term that includes music wire, hard-drawn wire, and oil-tempered wire. Alloy steels for stock extension springs are offered only in 300 series stainless.
Tolerances
Tolerances for extension spring rates depend upon the body-diameter to wire-diameter but are usually +/- 10% and +/- 5% on the diameter. The initial tension is much more difficult to control and is offered as a reference value only.
Ends
The ends on the extension springs offered in our stock inventory are the common machine-made hook and full-loop configurations. The hooks or loops may have an across center transition of the last coil before forming the hook or loop. The angle between hook/loop planes (end position) is random. If you need a specific end configuration, it is best to contact our custom spring department.
Measurements
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Hold the spring in one hand, and the calipers on the other hand.
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Place the calipers across the outside coil, either at the end of the center of the spring. This is called the Outside Diameter (O.D.).
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Place the calipers on the wire at one end of the body coil of the spring. This is called the Wire or Material Size.
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Place the calipers (or tape measure) on the full length of the spring, inside the hooks. This is called the Length (L.I.H.). (see diagram for example)
CUSTOM SPRING MANUFACTURING
Specification:
Wire Diameter:
This refers to the diameter of the wire used to make the spring. Thicker wires provide greater strength but can result in a larger spring body.
Outer Diameter: The total diameter of the spring when it's in its uncompressed state.
Inner Diameter: The diameter of the spring's coils when it's in its uncompressed state.
Free Length: The overall length of the spring when it's not under any load or tension.
Total Coils: The number of coils in the spring, including both active coils (those contributing to the spring's function) and inactive coils (the end hooks or loops).
Initial Tension:
As mentioned earlier, this determines how tightly the spring is coiled when it's in its natural state. It affects the force required to start extending the spring.
Load and Force Ratings:
Extension springs are rated for the amount of force or load they can handle without permanent deformation. This specification is crucial for selecting the appropriate spring for a given application.
Materials and Finish:
The choice of material impacts factors like corrosion resistance, tensile strength, and overall durability. Springs can have various finishes like zinc plating or powder coating to protect against environmental factors.
Cycle Life: This indicates how many times the spring can extend and return to its original shape before experiencing fatigue or failure.
End Configurations: Extension springs can have various types of end loops or hooks to facilitate attachment to other components or structures.
Application-Specific Variations:
Some extension springs might have unique designs or features tailored to specific applications, such as safety features or noise reduction mechanisms.
Music wire
Stainless Steel -302/304, 17-7
Inconel
Hastelloy
Titianium
MP35N
Elgiloy
Monel
Hard Drawn
Hard Drawn Galvanized
Oil Tempered
Chrome Silicon
Chrome Silicon Valve Grade
Phosphor Bronze
Beryllium Copper
Nichrome-Resistance wire
Grinding
Pre-setting
Load testing
Shot peening
Vibratory finishing
Heat treating
Spring Specifications
Zinc (upon request)
Gold Irridite (upon request)
Black Oxide (upon request)
Passivated (upon request)
None (upon request)
None (can be plated upon request)
Raw Material Options
Additional Resources
Finishing Options
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Music wire
Stainless Steel -302/304, 17-7
Inconel
Hastelloy
Titianium
MP35N
Elgiloy
Monel
Hard Drawn
Hard Drawn Galvanized
Oil Tempered
Chrome Silicon
Chrome Silicon Valve Grade
Phosphor Bronze
Beryllium Copper
Nichrome-Resistance wire
Grinding
Pre-setting
Load testing
Shot peening
Vibratory finishing
Heat treating
Spring Specifications
Zinc (upon request)
Gold Irridite (upon request)
Black Oxide (upon request)
Passivated (upon request)
None (can be plated upon request)
Raw Material Options
Additional Resources
Finishing Options
