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5666CS - 8 Inch Spring Steel Extension Springs

Inventory Status
Estimated Lead Time

The 5666CS is a regular extension spring manufactured by Century Spring. It is made from spring steel and has a zinc finish. This spring has a wire diameter of 0.054 inches, an outside diameter of 0.437 inches, and a free length of 8 inches. It has an initial tension of 2 Pound and a maximum deflection of 6.2 inches. The 5666CS has a spring rate of 1.6 lbs/inch and a maximum load of 12 Pound Force. It features machine hook ends and is suitable for various extension spring applications.

At Century Spring, we pride ourselves on fast shipping and maintaining a significant stock inventory. Our products, including the 5666CS, are proudly made in the United States. With our reliable shipping and ample supply, Century Spring ensures that customers can quickly receive the springs they need for their projects.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 2 lb
Length 8 in
Material Spring Steel
Outside Diameter 0.437 in
Part Type Standard
Rate 1.6 lbs/in
SKU 5666CS
Sugg Max Deflection 6.2 in
Sugg Max Load 12 lbf
Wind Direction Left
Wire Diameter 0.054 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.91 kg
Length 203.2 mm
Material Spring Steel
Outside Diameter 11.1 mm
Part Type Standard
Rate 0.28 N/mm
SKU 5666CS
Sugg Max Deflection 157.48 mm
Sugg Max Load 53.38 N
Wind Direction Left
Wire Diameter 1.37 mm