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521CS - 1.5" Spring Steel Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from spring steel with 10 coils and closed ends. This spring features an O.D. of 0.5", and an I.D. of 0.418".

Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 521
Ends Closed
Finish Zinc
Free Length 1.5 in
Inside Diameter 0.418 in
Material Spring Steel
Outside Diameter 0.5 in
Part Type Standard
Rate 5.3 lbs/in
SKU 521CS
Solid Length 0.45 in
Suggested Max Deflection 1 in
Suggested Max Load 5.4 lbf
Total Coils 10
Wire Diameter 0.041 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 521
Ends Closed
Finish Zinc
Free Length 38.1 mm
Inside Diameter 10.62 mm
Material Spring Steel
Outside Diameter 12.7 mm
Part Type Standard
Rate 0.93 N/mm
SKU 521CS
Solid Length 11.43 mm
Suggested Max Deflection 25.4 mm
Suggested Max Load 24.02 N
Total Coils 10
Wire Diameter 1.04 mm
The 521 compression spring is engineered for optimal performance in demanding applications. Constructed from high-quality spring steel 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 521CS compression spring is designed with a free length of 1.06" total of 7.75 coils, and a rate of 11 lbs/in providing a balanced combination of flexibility and strength. This spring coil, and its closed & ground end configuration allows for efficient energy storage and release, making it suitable for applications requiring precise motion control.

The 521 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.