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Century Spring

11721CS - 3.06" Spring Steel Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from spring steel with 8 coils and closed & ground ends. This spring features an O.D. of 1.343", and an I.D. of 1.101".

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Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 11721
Ends Closed & Ground
Finish Zinc
Free Length 3.06 in
Inside Diameter 1.101 in
Material Spring Steel
Outside Diameter 1.343 in
Part Type Standard
Rate 28 lbs/in
SKU 11721CS
Solid Length 0.97 in
Suggested Max Deflection 1.5 in
Suggested Max Load 42 lbf
Total Coils 8
Wire Diameter 0.121 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 11721
Ends Closed & Ground
Finish Zinc
Free Length 77.72 mm
Inside Diameter 27.97 mm
Material Spring Steel
Outside Diameter 34.11 mm
Part Type Standard
Rate 4.9 N/mm
SKU 11721CS
Solid Length 24.64 mm
Suggested Max Deflection 38.1 mm
Suggested Max Load 186.82 N
Total Coils 8
Wire Diameter 3.07 mm
The 11721CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.121" diameter spring steel, the 11721 spring design exhibits reliable strength across its 8 active coils, withstanding repeated compression cycles with a maximum load of 42 lbf without succumbing to fatigue.

We manufacture the 11721 design to provide a compression spring that is 3.06" long at rest and provides a consistent rate of 28 lbs/in along its recommended maximum of 1.5" deflection. For best results, your application should fully accommodate the inner (1.101") and outer (1.343") diameters of this spring and be designed for its closed & ground end configuration.

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