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S-640CS - 4.72 Inch 302/304 Stainless Steel Extension Springs

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The S-640CS is a regular extension spring manufactured by Century Spring. It is made from 302/304 Stainless Steel and has a wire diameter of 0.072 inches. This spring has a free length of 4.72 Inch and an outside diameter of 0.468 inches. It has an initial tension of 6 Pound and a maximum deflection of 2 inches. With a rate of 9.5 lbs/inch, it can provide the necessary force for various applications. The S-640CS features a left wind direction and is equipped with machine hook ends. It has a maximum load capacity of 25 Pound Force.

At Century Spring, we offer fast shipping and maintain a significant stock inventory. Our products, including the S-640CS, 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 None
Initial Tension 7 lb
Length 4.72 in
Material 302/304 Stainless Steel
Outside Diameter 0.468 in
Part Type Standard
Rate 9.5 lbs/in
SKU S-640CS
Sugg Max Deflection 2 in
Sugg Max Load 25 lbf
Wire Diameter 0.072 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish None
Initial Tension 3.17 kg
Length 119.89 mm
Material 302/304 Stainless Steel
Outside Diameter 11.89 mm
Part Type Standard
Rate 1.66 N/mm
SKU S-640CS
Sugg Max Deflection 50.8 mm
Sugg Max Load 111.2 N
Wire Diameter 1.83 mm