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E-21CS - Carbon Steel Long Length Extension Springs

The E-21CS is an extension spring manufactured by Century Spring. It is made from carbon steel and has a plain finish. This spring has a wire diameter of 0.035 inches, an outside diameter of 0.438 inches, and a length of 36 inches. It has an initial tension of 1 Pound and a maximum load of 3.4 Pound Force. The E-21CS is a long length extension spring, designed for applications that require a longer reach.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of getting the springs you need quickly, which is why we offer reliable and efficient shipping services. Additionally, all of our springs, including the E-21CS, are proudly made in the United States. With Century Spring, you can trust that you're receiving high-quality springs manufactured with precision and care.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Finish None
Initial Tension
(Approx.)
1 lb
Length 36 in
Material Carbon Steel
Max Load
(Suggested)
3.4 lbf
Measurement Units Standard
Outside Diameter 0.438 in
Rate (Constant) 0.032 lbs
SKU E-21CS
Wire Diameter 0.035 in
Specs (in metric)
Label Value
Brand Century Spring
Finish None
Initial Tension
(Approx.)
0.45 kg
Length 914.4 mm
Material Carbon Steel
Max Load
(Suggested)
15.12 N
Measurement Units Standard
Outside Diameter 11.13 mm
Rate (Constant) 0.01 N/mm
SKU E-21CS
Wire Diameter 0.89 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours