Compression Coil Springs
A compression coil spring is a spring made by winding wire into a helix that resists and returns force when compressed along its axis. The load is roughly proportional to the deflection, and the proportionality constant is the spring rate. It is used for return, cushioning, preload, and maintaining contact pressure in general machinery, industrial machinery, dies, jigs and fixtures, precision equipment and more. Materials include stainless spring steel wire (SUS304WPB), piano wire (SWP), and oil-tempered wire. Many products conform to standard dimensions such as JIS or DIN 2098, and some are low-temperature stress relieved after forming to stabilize performance.
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Compression Coil Springs
S Series Compression Coil Springs
Piano wire and oil-tempered wire compression coil springs with wire diameters of 1.0 to 9.0 mm, for industrial machinery, dies, jigs and fixtures.
KS Industries Co., Ltd.
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Compression Coil Springs
D Series Compression Coil Spring
Compression coil spring manufactured in accordance with the German standard DIN 2098. Available in wire diameters from 0.1 to 10.0 mm, with stainless steel, piano wire, and oil-tempered wire material options.
KS Industries Co., Ltd.
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Compression Coil Springs
DS Series Compression Coil Spring
Compression coil spring based on the piano wire standard dimensions of the D Series, with the material changed to stainless spring steel wire. Wire diameter 0.5 to 5.0 mm.
KS Industries Co., Ltd.
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Compression Coil Springs
K Series Compression Coil Spring
General-purpose cold-formed compression coil spring conforming to JIS standards. Made of SUS304WPB stainless steel wire with wire diameters of 0.2 to 3.2 mm; numerous dimensions available under product codes 1001 to 2341.
KS Industries Co., Ltd.
How to choose Compression Coil Springs
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1. Select by required load and spring rate
The spring rate is the load required to deflect the spring by 1 mm. Multiplying the difference between installed and operating length by the spring rate gives the estimated load generated. Check whether the target load can be achieved within that deflection range, and narrow down candidates by spring rate value.
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2. Outside or inside diameter to fit the bore or shaft
Check the outside diameter when the spring fits into a bore, and the inside diameter when it fits over a shaft. Because the coil diameter slightly increases under compression, allow clearance to the bore or shaft. The outside diameters of the listed products range from 3 to 11 mm.
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3. Match free length to installation space
Free length is the length under no load. The difference from the installed length is the initial deflection, which determines the preload force. Slender springs are prone to buckling (bending sideways), so also consider whether a guide rod or guide bore is needed.
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4. Do not exceed maximum allowable deflection and load
Confirm that the maximum operating stroke stays within the maximum allowable deflection and does not reach solid height. Using the spring beyond the allowable value can cause set (permanent deformation) or fatigue failure. Allow a margin in applications with repeated operation.
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5. Choose material to suit the environment
SUS304WPB offers corrosion resistance and, in the listed examples, can be used at -30 to +200 °C. Piano wire and oil-tempered wire suit applications that benefit from high strength, but they rust easily, so check whether surface treatment or rust prevention is required.
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6. End shape that affects seating
Springs with ground ends have flat seating surfaces, so the load acts straight along the axis and the spring is less likely to tilt. For applications such as dies and jigs that require stable posture, check whether grinding is specified.
This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.