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Century Spring

3221CS - 0.69" Spring Steel Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from spring steel with 4 coils and closed & ground ends. This spring features an O.D. of 0.64", and an I.D. of 0.518".

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

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 3221
Ends Closed & Ground
Finish Gold Iridite
Free Length 0.69 in
Inside Diameter 0.518 in
Material Spring Steel
Outside Diameter 0.64 in
Part Type Standard
Rate 51 lbs/in
SKU 3221CS
Solid Length 0.24 in
Suggested Max Deflection 0.25 in
Suggested Max Load 13 lbf
Total Coils 4
Wire Diameter 0.061 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 3221
Ends Closed & Ground
Finish Gold Iridite
Free Length 17.53 mm
Inside Diameter 13.16 mm
Material Spring Steel
Outside Diameter 16.26 mm
Part Type Standard
Rate 8.93 N/mm
SKU 3221CS
Solid Length 6.1 mm
Suggested Max Deflection 6.35 mm
Suggested Max Load 57.82 N
Total Coils 4
Wire Diameter 1.55 mm
The 3221CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.061" diameter spring steel, the 3221 spring design exhibits reliable strength across its 4 active coils, withstanding repeated compression cycles with a maximum load of 13 lbf without succumbing to fatigue.

We manufacture the 3221 design to provide a compression spring that is 0.69" long at rest and provides a consistent rate of 51 lbs/in along its recommended maximum of 0.25" deflection. For best results, your application should fully accommodate the inner (0.518") and outer (0.64") diameters of this spring and be designed for its closed & ground end configuration.

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