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S-581CS - 3.50 Inch 302/304 Stainless Steel Extension Springs

Inventory Status
Estimated Lead Time

The S-581CS is a regular extension spring manufactured by Century Spring. It is made from 302/304 stainless steel and has a smooth finish. This spring has a wire diameter of 0.054 inches, an outside diameter of 0.5 inches, and a free length of 3.5 inches. It has an initial tension of 2 Pound and a maximum deflection of 3.7 inches. The S-581CS has a spring rate of 2.2 lbs/inch and a maximum load of 9.9 Pound Force. It features full loop ends and is suitable for various extension spring applications.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand that time is valuable, which is why we strive to deliver our products quickly to our customers. Additionally, all our springs, including the S-581CS, are proudly made in the United States. With our commitment to quality and efficiency, Century Spring ensures that you can rely on us for your spring needs.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish None
Initial Tension 2 lb
Length 3.5 in
Material 302/304 Stainless Steel
Outside Diameter 0.5 in
Part Type Standard
Rate 2.2 lbs/in
SKU S-581CS
Sugg Max Deflection 3.7 in
Sugg Max Load 9.9 lbf
Wind Direction Left
Wire Diameter 0.054 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish None
Initial Tension 0.91 kg
Length 88.9 mm
Material 302/304 Stainless Steel
Outside Diameter 12.7 mm
Part Type Standard
Rate 0.39 N/mm
SKU S-581CS
Sugg Max Deflection 93.98 mm
Sugg Max Load 44.04 N
Wind Direction Left
Wire Diameter 1.37 mm