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304CS - 4.50 Inch Music Wire Extension Springs

The 304CS is a regular extension spring manufactured by Century Spring. Made from durable music wire with a zinc finish, this spring is designed for reliable performance. It has a free length of 4.5 inches and an outside diameter of 0.437 inches. With an initial tension of 0.1 pound, it can withstand a maximum deflection of 25 inches. The 304CS has a maximum load of 2.5 pound force and a spring rate of 0.09 inches per pound. Its ends are full looped, ensuring secure attachment. This standard extension spring is suitable for a variety of applications.

At Century Spring, we understand the importance of fast shipping and maintaining a substantial stock inventory. We take pride in producing high-quality springs, including the 304CS, right here in the United States. Our commitment to efficient shipping and ample supply ensures that our customers receive the springs they need promptly. Trust Century Spring for all your spring requirements.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.1 lb
Length 4.5 in
Material Music Wire
Outside Diameter 0.437 in
Part Type Standard
Rate 0.09 lbs/in
SKU 304CS
Sugg Max Deflection 25 in
Sugg Max Load 2.5 lbf
Wind Direction Left
Wire Diameter 0.028 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.05 kg
Length 114.3 mm
Material Music Wire
Outside Diameter 11.1 mm
Part Type Standard
Rate 0.02 N/mm
SKU 304CS
Sugg Max Deflection 635 mm
Sugg Max Load 11.12 N
Wind Direction Left
Wire Diameter 0.71 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $3.85
50 - 149 $3.66
150 - 299 $3.47
300 - 499 $3.28
500 - 749 $2.89
750 - 999 $2.51
1000+ Call for price