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Century Spring

B9-31CS - 0.25" Music Wire Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from music wire with 4.5 coils and closed & ground ends. This spring features an O.D. of 0.188", and an I.D. of 0.15".

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Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name B9-31
Ends Closed & Ground
Finish Zinc
Free Length 0.25 in
Inside Diameter 0.15 in
Material Music Wire
Outside Diameter 0.188 in
Part Type Standard
Rate 16 lbs/in
SKU B9-31CS
Solid Length 0.09 in
Suggested Max Deflection 0.14 in
Suggested Max Load 2.2 lbf
Total Coils 4.5
Wire Diameter 0.019 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name B9-31
Ends Closed & Ground
Finish Zinc
Free Length 6.35 mm
Inside Diameter 3.81 mm
Material Music Wire
Outside Diameter 4.78 mm
Part Type Standard
Rate 2.8 N/mm
SKU B9-31CS
Solid Length 2.29 mm
Suggested Max Deflection 3.56 mm
Suggested Max Load 9.79 N
Total Coils 4.5
Wire Diameter 0.48 mm
The B9-31CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.019" diameter music wire, the B9-31 spring design exhibits reliable strength across its 4.5 active coils, withstanding repeated compression cycles with a maximum load of 2.2 lbf without succumbing to fatigue.

We manufacture the B9-31 design to provide a compression spring that is 0.25" long at rest and provides a consistent rate of 16 lbs/in along its recommended maximum of 0.14" deflection. For best results, your application should fully accommodate the inner (0.15") and outer (0.188") diameters of this spring and be designed for its closed & ground end configuration.

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