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5129CS - 7 Inch Spring Steel Extension Springs

The 5129CS is a regular extension spring manufactured by Century Spring. It is made from spring steel and has a zinc finish. This spring has a wire diameter of 0.041 inches, an outside diameter of 0.375 inches, and a free length of 7 inches. It has an initial tension of 1 Pound and a maximum deflection of 8 inches. The 5129CS has a spring rate of 0.69 inches per pound and a maximum load of 6.5 Pound Force. It features machine hook ends and is designed for various extension applications.

At Century Spring, we pride ourselves on our fast shipping and extensive stock inventory. We understand the importance of timely delivery, which is why we prioritize efficient shipping processes. Additionally, our substantial stock ensures that we can meet the demands of our customers promptly. We are proud to manufacture our springs in the United States, maintaining high-quality standards and supporting local manufacturing. With Century Spring, you can rely on our fast shipping, ample stock, and American-made products to fulfill your spring needs.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 1 lb
Length 7 in
Material Spring Steel
Outside Diameter 0.375 in
Part Type Standard
Rate 0.69 lbs/in
SKU 5129CS
Sugg Max Deflection 8 in
Sugg Max Load 6.5 lbf
Wind Direction Left
Wire Diameter 0.041 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.45 kg
Length 177.8 mm
Material Spring Steel
Outside Diameter 9.53 mm
Part Type Standard
Rate 0.12 N/mm
SKU 5129CS
Sugg Max Deflection 203.2 mm
Sugg Max Load 28.91 N
Wind Direction Left
Wire Diameter 1.04 mm
Inventory Status
Low Stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $5.87
50 - 149 $5.58
150 - 299 $5.29
300 - 499 $4.99
500 - 749 $4.41
750 - 999 $3.82
1000+ Call for price