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B9-12CS - 0.69" Music Wire Compression Spring

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Compression spring manufactured from music wire with 3.33 coils and closed ends. This spring features an O.D. of 0.484", and an I.D. of 0.436".

NOTE: The spring rate value for compression springs with 4 coils or less is a reference value.

Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name B9-12
Ends Closed
Finish Zinc
Free Length 0.69 in
Inside Diameter 0.436 in
Material Music Wire
Outside Diameter 0.484 in
Part Type Standard
Rate 3.7 lbs/in
SKU B9-12CS
Solid Length 0.1 in
Suggested Max Deflection 0.47 in
Suggested Max Load 1.7 lbf
Total Coils 3.33
Wire Diameter 0.024 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name B9-12
Ends Closed
Finish Zinc
Free Length 17.53 mm
Inside Diameter 11.07 mm
Material Music Wire
Outside Diameter 12.29 mm
Part Type Standard
Rate 0.65 N/mm
SKU B9-12CS
Solid Length 2.54 mm
Suggested Max Deflection 11.94 mm
Suggested Max Load 7.56 N
Total Coils 3.33
Wire Diameter 0.61 mm
The B9-12 compression spring is engineered for optimal performance in demanding applications. Constructed from high-quality music wire and designed with precision and durability in mind, this spring is an essential component for a variety of mechanical systems where reliable force and resilience are paramount.

The B9-12CS compression spring is designed with a free length of 1.5" total of 15 coils, and a rate of 9.3 lbs/in providing a balanced combination of flexibility and strength. This spring coil, and its closed end configuration allows for efficient energy storage and release, making it suitable for applications requiring precise motion control.

The B9-12 spring design is ideal for use in industrial machinery, automotive systems, and various mechanical assemblies where reliable force application is crucial. Its robust construction and thoughtful design make it a dependable choice for engineers seeking a high-performance spring solution.