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Century Spring

4040CS - 20.5" Spring Steel Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from spring steel with 40 coils and closed & ground ends. This spring features an O.D. of 1.437", and an I.D. of 1.113".

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Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 4040
Ends Closed & Ground
Finish Zinc
Free Length 20.5 in
Inside Diameter 1.113 in
Material Spring Steel
Outside Diameter 1.437 in
Part Type Standard
Rate 12 lbs/in
SKU 4040CS
Solid Length 6.4 in
Suggested Max Deflection 7.4 in
Suggested Max Load 88 lbf
Total Coils 40
Wire Diameter 0.162 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 4040
Ends Closed & Ground
Finish Zinc
Free Length 520.7 mm
Inside Diameter 28.27 mm
Material Spring Steel
Outside Diameter 36.5 mm
Part Type Standard
Rate 2.1 N/mm
SKU 4040CS
Solid Length 162.56 mm
Suggested Max Deflection 187.96 mm
Suggested Max Load 391.42 N
Total Coils 40
Wire Diameter 4.11 mm
The 4040CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.162" diameter spring steel, the 4040 spring design exhibits reliable strength across its 40 active coils, withstanding repeated compression cycles with a maximum load of 88 lbf without succumbing to fatigue.

We manufacture the 4040 design to provide a compression spring that is 20.5" long at rest and provides a consistent rate of 12 lbs/in along its recommended maximum of 7.4" deflection. For best results, your application should fully accommodate the inner (1.113") and outer (1.437") diameters of this spring and be designed for its closed & ground end configuration.

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