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309CS - 3.25 Inch Music Wire Extension Springs

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

The 309CS is a regular extension spring manufactured by Century Spring. It is made from high-quality music wire and features a durable zinc finish. This spring has a wire diameter of 0.025 inch and an outside diameter of 0.25 inches. Its free length measures 3.25 inches, with an initial tension of 0.36 pound. The 309CS offers a maximum deflection of 6.4 inches and can withstand a maximum load of 3.1 pound force. With a spring rate of 0.44 inches per pound, this left wind spring is perfect for a variety of applications.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of timely delivery, which is why we strive to promptly ship out our products. In addition, our wide selection of springs, including the 309CS, is proudly made in the United States. With our commitment to quality and reliable shipping, Century Spring ensures that customers can easily obtain the springs they need for their projects.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.36 lb
Length 3.25 in
Material Music Wire
Outside Diameter 0.25 in
Part Type Standard
Rate 0.44 lbs/in
SKU 309CS
Sugg Max Deflection 6.4 in
Sugg Max Load 3.1 lbf
Wind Direction Left
Wire Diameter 0.025 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.16 kg
Length 82.55 mm
Material Music Wire
Outside Diameter 6.35 mm
Part Type Standard
Rate 0.08 N/mm
SKU 309CS
Sugg Max Deflection 162.56 mm
Sugg Max Load 13.79 N
Wind Direction Left
Wire Diameter 0.64 mm