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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.

190 DAYS

129CS - 8.50 Inch High Carbon Steel Extension Springs

Inventory:           
Estimated Lead Time

The 129CS is a regular extension spring manufactured by Century Spring. It is made from High Carbon steel and has a zinc finish. This spring has a wire diameter of 0.091 inches, an outer diameter of 0.625 inches, and a free length of 8.5 inches. It has an initial tension of 9 Pound and a maximum deflection of 3.8 inches. The 129CS has a spring rate of 7.7 lbs/inch and a maximum load of 39 Pound Force. It features machine hooks on both ends. This regular extension spring is suitable for various applications.

At Century Spring, we pride ourselves on our fast shipping and extensive stock inventory. Our products, including the 129CS, are proudly made in the United States. With our efficient shipping process and large supply, we ensure that customers can rely on us to quickly deliver the springs they need for their projects.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku 129CS
C) Part Type Standard
D) Material High Carbon Steel
E) Wire Diameter 0.091 in
F) Outside Diameter 0.625 in
G) Length 8.5 in
H) End Type Machine Hook
I) End Position Random
J) Rate 7.7 lbs/in
K) Initial Tension 9 lb
L) Sugg Max Deflection 3.8 in
L) Sugg Max Load 39 lbf
O) Finish Zinc
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku 129CS
C) Part Type Standard
D) Material High Carbon Steel
E) Wire Diameter 2.31 mm
F) Outside Diameter 15.88 mm
G) Length 215.9 mm
H) End Type Machine Hook
I) End Position Random
J) Rate 1.35 N/mm
K) Initial Tension 4.08 kg
L) Sugg Max Deflection 96.52 mm
L) Sugg Max Load 173.47 N
O) Finish Zinc