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3728CS - 2.5" Spring Steel Compression Spring

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Compression spring manufactured from spring steel with 21.5 coils and closed & ground ends. This spring features an O.D. of 0.437", and an I.D. of 0.277".

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Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 3728
Ends Closed & Ground
Finish Zinc
Free Length 2.5 in
Inside Diameter 0.277 in
Material Spring Steel
Outside Diameter 0.437 in
Part Type Standard
Rate 66 lbs/in
SKU 3728CS
Solid Length 1.72 in
Suggested Max Deflection 0.57 in
Suggested Max Load 38 lbf
Total Coils 21.5
Wire Diameter 0.08 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 3728
Ends Closed & Ground
Finish Zinc
Free Length 63.5 mm
Inside Diameter 7.04 mm
Material Spring Steel
Outside Diameter 11.1 mm
Part Type Standard
Rate 11.56 N/mm
SKU 3728CS
Solid Length 43.69 mm
Suggested Max Deflection 14.48 mm
Suggested Max Load 169.02 N
Total Coils 21.5
Wire Diameter 2.03 mm
The 3728CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.08" diameter spring steel, the 3728 spring design exhibits reliable strength across its 21.5 active coils, withstanding repeated compression cycles with a maximum load of 38 lbf without succumbing to fatigue.

We manufacture the 3728 design to provide a compression spring that is 2.5" long at rest and provides a consistent rate of 66 lbs/in along its recommended maximum of 0.57" deflection. For best results, your application should fully accommodate the inner (0.277") and outer (0.437") diameters of this spring and be designed for its closed & ground end configuration.

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