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660CS - 11.50 Inch High Carbon Steel Extension Springs

The 660CS is a regular extension spring manufactured by Century Spring. It features double loop ends and is finished with zinc for added durability. This spring has a free length of 11.5 inches and an initial tension of 8.2 pounds. Made from High Carbon steel, it can withstand a maximum deflection of 15 inches and support a maximum load of 47 pounds force. With an outside diameter of 1.5 inches and a wire diameter of 0.135 inches, this spring has a rate of 2.7 inches per pound. It is shipped with a weight of 1.3454 pounds. The 660CS extension spring is suitable for a wide range of applications.

At Century Spring, we pride ourselves on fast shipping and a substantial stock inventory. Our products, including the 660CS extension spring, are proudly made in the United States. With our efficient shipping process and ample supply, we ensure that customers can quickly receive the high-quality springs they need for their projects.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Double Loop
Finish Zinc
Initial Tension 8.2 lb
Length 11.5 in
Material High Carbon Steel
Outside Diameter 1.5 in
Part Type Standard
Rate 2.7 lbs/in
SKU 660CS
Sugg Max Deflection 15 in
Sugg Max Load 47 lbf
Wind Direction Left
Wire Diameter 0.135 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Double Loop
Finish Zinc
Initial Tension 3.72 kg
Length 292.1 mm
Material High Carbon Steel
Outside Diameter 38.1 mm
Part Type Standard
Rate 0.47 N/mm
SKU 660CS
Sugg Max Deflection 381 mm
Sugg Max Load 209.06 N
Wind Direction Left
Wire Diameter 3.43 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $17.10
50 - 149 $16.25
150 - 299 $15.39
300 - 499 $14.54
500 - 749 $12.83
750 - 999 $11.12
1000+ Call for price