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307CS - 4.50 Inch Music Wire Extension Springs

The 307CS is a regular extension spring manufactured by Century Spring. This spring, made from high-quality music wire, is finished with a durable zinc coating. It has a wire diameter of 0.025 Inch and an outside diameter of 0.343 inches. The free length of the spring is 4.5 inches, and it has an initial tension of 0.2 Pound. With a maximum deflection of 20 Inch and a maximum load of 2.3 Pound Force, this extension spring is suitable for a range of applications. It features full loop ends and has a spring rate of 0.11 inches per pound.

At Century Spring, we take pride in our fast shipping and extensive inventory. We understand the importance of timely delivery and offer quick shipping options to ensure our customers receive their springs promptly. With our significant stock of springs, including the 307CS, we strive to meet the demands of various projects. Additionally, all our springs are proudly made in the United States, ensuring high-quality craftsmanship and supporting local manufacturing. Trust Century Spring for reliable shipping, ample supply, and exceptional springs for your needs.

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 0.343 in
Part Type Standard
Rate 0.11 lbs/in
SKU 307CS
Sugg Max Deflection 20 in
Sugg Max Load 2.3 lbf
Wind Direction Left
Wire Diameter 0.025 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.09 kg
Length 114.3 mm
Material Music Wire
Outside Diameter 8.71 mm
Part Type Standard
Rate 0.02 N/mm
SKU 307CS
Sugg Max Deflection 508 mm
Sugg Max Load 10.23 N
Wind Direction Left
Wire Diameter 0.64 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $3.91
50 - 149 $3.72
150 - 299 $3.52
300 - 499 $3.33
500 - 749 $2.94
750 - 999 $2.55
1000+ Call for price