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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-640CS - 4.72 Inch 302/304 Stainless Steel Extension Springs

Inventory:           
Estimated Lead Time

The S-640CS is a regular extension spring manufactured by Century Spring. It is made from 302/304 Stainless Steel and has a wire diameter of 0.072 inches. This spring has a free length of 4.72 Inch and an outside diameter of 0.468 inches. It has an initial tension of 6 Pound and a maximum deflection of 2 inches. With a rate of 9.5 lbs/inch, it can provide the necessary force for various applications. The S-640CS features a left wind direction and is equipped with machine hook ends. It has a maximum load capacity of 25 Pound Force.

At Century Spring, we offer fast shipping and maintain a significant stock inventory. Our products, including the S-640CS, are proudly made in the United States. With our reliable shipping and ample supply, Century Spring ensures that customers can quickly receive the springs they need for their projects.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku S-640CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 0.072 in
F) Outside Diameter 0.468 in
G) Length 4.72 in
H) End Type Machine Hook
I) End Position Random
J) Rate 9.5 lbs/in
K) Initial Tension 7 lb
L) Sugg Max Deflection 2 in
L) Sugg Max Load 25 lbf
O) Finish None
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku S-640CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 1.83 mm
F) Outside Diameter 11.89 mm
G) Length 119.89 mm
H) End Type Machine Hook
I) End Position Random
J) Rate 1.66 N/mm
K) Initial Tension 3.17 kg
L) Sugg Max Deflection 50.8 mm
L) Sugg Max Load 111.2 N
O) Finish None