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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-591CS - 3.75 Inch 302/304 Stainless Steel Extension Springs

Inventory:           
Estimated Lead Time

The S-591CS is a regular extension spring manufactured by Century Spring. It is made from 302/304 stainless steel and has a machine hook on both ends. This spring has a free length of 3.75 inches and a wire diameter of 0.072 inches. The outside diameter measures 0.562 inches. It has an initial tension of 4 pounds and a maximum deflection of 2.4 inches. The spring rate is 6.9 lbs/inch and it can handle a maximum load of 21 pounds force. The S-591CS is a left-wound spring and weighs 0.0814 pounds.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of prompt delivery and strive to ensure that our customers receive their springs quickly. Additionally, all of our products, including the S-591CS, are proudly made in the United States. With our reliable shipping and ample supply, Century Spring is the trusted choice for all your spring needs.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku S-591CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 0.072 in
F) Outside Diameter 0.562 in
G) Length 3.75 in
H) End Type Machine Hook
I) End Position Random
J) Rate 6.9 lbs/in
K) Initial Tension 4 lb
L) Sugg Max Deflection 2.4 in
L) Sugg Max Load 21 lbf
O) Finish None
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku S-591CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 1.83 mm
F) Outside Diameter 14.27 mm
G) Length 95.25 mm
H) End Type Machine Hook
I) End Position Random
J) Rate 1.21 N/mm
K) Initial Tension 1.81 kg
L) Sugg Max Deflection 60.96 mm
L) Sugg Max Load 93.41 N
O) Finish None