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306CS - 4.50 Inch Spring Steel Extension Springs

Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours

The 306CS 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 0.035 inches, an outside diameter of 0.406 inches, and a free length of 4.5 inches. It has an initial tension of 0.4 Pound and a maximum load of 3.7 Pound Force. The 306CS is designed with machine hook ends and has a maximum deflection of 9 inches. It is a left-wound spring and is suitable for various applications.

Century Spring offers fast shipping and maintains a significant stock inventory. We are proud to manufacture our products 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.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.4 lb
Length 4.5 in
Material Spring Steel
Outside Diameter 0.406 in
Part Type Standard
Rate 0.37 lbs/in
SKU 306CS
Sugg Max Deflection 9 in
Sugg Max Load 3.7 lbf
Wind Direction Left
Wire Diameter 0.035 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.18 kg
Length 114.3 mm
Material Spring Steel
Outside Diameter 10.31 mm
Part Type Standard
Rate 0.06 N/mm
SKU 306CS
Sugg Max Deflection 228.6 mm
Sugg Max Load 16.46 N
Wind Direction Left
Wire Diameter 0.89 mm