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Century Spring

12539CS - 1.2" Spring Steel Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from spring steel with 3.75 coils and closed ends. This spring features an O.D. of 1.375", and an I.D. of 1.081".

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 12539
Ends Closed
Finish None
Free Length 1.2 in
Inside Diameter 1.081 in
Material Spring Steel
Outside Diameter 1.375 in
Part Type Standard
Rate 207 lbs/in
SKU 12539CS
Solid Length 0.7 in
Suggested Max Deflection 0.34 in
Suggested Max Load 71 lbf
Total Coils 3.75
Wire Diameter 0.147 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 12539
Ends Closed
Finish None
Free Length 30.48 mm
Inside Diameter 27.46 mm
Material Spring Steel
Outside Diameter 34.93 mm
Part Type Standard
Rate 36.25 N/mm
SKU 12539CS
Solid Length 17.78 mm
Suggested Max Deflection 8.64 mm
Suggested Max Load 315.81 N
Total Coils 3.75
Wire Diameter 3.73 mm
The 12539CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.147" diameter spring steel, the 12539 spring design exhibits reliable strength across its 3.75 active coils, withstanding repeated compression cycles with a maximum load of 71 lbf without succumbing to fatigue.

We manufacture the 12539 design to provide a compression spring that is 1.2" long at rest and provides a consistent rate of 207 lbs/in along its recommended maximum of 0.34" deflection. For best results, your application should fully accommodate the inner (1.081") and outer (1.375") diameters of this spring and be designed for its closed end configuration.

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