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Century Spring

3640CS - 1.38" Spring Steel Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from spring steel with 9.5 coils and closed & ground ends. This spring features an O.D. of 0.453", and an I.D. of 0.345".

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Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 3640
Ends Closed & Ground
Finish Zinc
Free Length 1.38 in
Inside Diameter 0.345 in
Material Spring Steel
Outside Diameter 0.453 in
Part Type Standard
Rate 26 lbs/in
SKU 3640CS
Solid Length 0.51 in
Suggested Max Deflection 0.48 in
Suggested Max Load 12 lbf
Total Coils 9.5
Wire Diameter 0.054 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 3640
Ends Closed & Ground
Finish Zinc
Free Length 35.05 mm
Inside Diameter 8.76 mm
Material Spring Steel
Outside Diameter 11.51 mm
Part Type Standard
Rate 4.55 N/mm
SKU 3640CS
Solid Length 12.95 mm
Suggested Max Deflection 12.19 mm
Suggested Max Load 53.38 N
Total Coils 9.5
Wire Diameter 1.37 mm
The 3640CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.054" diameter spring steel, the 3640 spring design exhibits reliable strength across its 9.5 active coils, withstanding repeated compression cycles with a maximum load of 12 lbf without succumbing to fatigue.

We manufacture the 3640 design to provide a compression spring that is 1.38" long at rest and provides a consistent rate of 26 lbs/in along its recommended maximum of 0.48" deflection. For best results, your application should fully accommodate the inner (0.345") and outer (0.453") diameters of this spring and be designed for its closed & ground end configuration.

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