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305CS - 4.50 Inch Music Wire Extension Springs

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

The 305CS 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 free length of 4.5 inches and an outside diameter of 0.375 inches. With an initial tension of 0.2 pound, it provides the necessary force for proper extension. The 305CS has a maximum deflection of 18 inches and can withstand a maximum load of 2.9 pound force. Its wire diameter is 0.028 inches, and it has a spring rate of 0.15 inches per pound. As a left-wind spring with full loop ends, it is designed for reliable performance. The 305CS is a standard extension spring suitable for a wide range of applications.

At Century Spring, we understand the importance of fast shipping and maintaining a significant stock inventory. We take pride in offering prompt delivery of our products, including the 305CS. Furthermore, all our springs are proudly made in the United States, ensuring exceptional quality and supporting local manufacturing. With our reliable shipping services and ample supply, Century Spring is committed to meeting our customers' needs promptly and efficiently.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.2 lb
Length 4.5 in
Material Music Wire
Outside Diameter 0.375 in
Part Type Standard
Rate 0.15 lbs/in
SKU 305CS
Sugg Max Deflection 18 in
Sugg Max Load 2.9 lbf
Wind Direction Left
Wire Diameter 0.028 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.09 kg
Length 114.3 mm
Material Music Wire
Outside Diameter 9.53 mm
Part Type Standard
Rate 0.03 N/mm
SKU 305CS
Sugg Max Deflection 457.2 mm
Sugg Max Load 12.9 N
Wind Direction Left
Wire Diameter 0.71 mm