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5780CS - 5.50 Inch Spring Steel Extension Springs

The 5780CS 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 0.162 inches, an outer diameter of 1.375 inches, and a free length of 5.5 inches. It has an initial tension of 21 Pound and a maximum deflection of 3 inches. The 5780CS can withstand a maximum load of 89 Pound Force. It features machine hooks at both ends to securely attach to other components. This regular extension spring is ideal for various applications requiring tension and flexibility.

At Century Spring, we prioritize fast shipping and maintain a significant stock inventory. Our products, including the 5780CS, are proudly made in the United States. With our efficient shipping processes and ample supply, we ensure that our customers receive their springs quickly and have access to the parts they need for their projects.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 21 lb
Length 5.5 in
Material Spring Steel
Outside Diameter 1.375 in
Part Type Standard
Rate 24 lbs/in
SKU 5780CS
Sugg Max Deflection 3 in
Sugg Max Load 89 lbf
Wind Direction Left
Wire Diameter 0.162 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 9.52 kg
Length 139.7 mm
Material Spring Steel
Outside Diameter 34.93 mm
Part Type Standard
Rate 4.2 N/mm
SKU 5780CS
Sugg Max Deflection 76.2 mm
Sugg Max Load 395.87 N
Wind Direction Left
Wire Diameter 4.11 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $16.31
50 - 149 $15.50
150 - 299 $14.68
300 - 499 $13.87
500 - 749 $12.24
750 - 999 $10.61
1000+ Call for price