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100 YRS

The Countdown to 100 Years of Century Spring!

Since 1927, Century Spring Corp has been the original industry-leading spring manufacturer for both stock and custom springs. Read about 100 Years of Century Spring here.

167 DAYS

S-581CS - 3.50 Inch 302/304 Stainless Steel Extension Springs

Inventory:           
Estimated Lead Time

The S-581CS is a regular extension spring manufactured by Century Spring. It is made from 302/304 stainless steel and has a smooth finish. This spring has a wire diameter of 0.054 inches, an outside diameter of 0.5 inches, and a free length of 3.5 inches. It has an initial tension of 2 Pound and a maximum deflection of 3.7 inches. The S-581CS has a spring rate of 2.2 lbs/inch and a maximum load of 9.9 Pound Force. It features full loop ends and is suitable for various extension spring applications.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand that time is valuable, which is why we strive to deliver our products quickly to our customers. Additionally, all our springs, including the S-581CS, are proudly made in the United States. With our commitment to quality and efficiency, Century Spring ensures that you can rely on us for your spring needs.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku S-581CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 0.054 in
F) Outside Diameter 0.5 in
G) Length 3.5 in
H) End Type Full Loop
I) End Position Random
J) Rate 2.2 lbs/in
K) Initial Tension 2 lb
L) Sugg Max Deflection 3.7 in
L) Sugg Max Load 9.9 lbf
O) Finish None
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku S-581CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 1.37 mm
F) Outside Diameter 12.7 mm
G) Length 88.9 mm
H) End Type Full Loop
I) End Position Random
J) Rate 0.39 N/mm
K) Initial Tension 0.91 kg
L) Sugg Max Deflection 93.98 mm
L) Sugg Max Load 44.04 N
O) Finish None