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603CS - 8 Inch High Carbon Steel Extension Springs

The 603CS is a regular extension spring manufactured by Century Spring. It is made from High Carbon steel and features a zinc finish. This spring has a wire diameter of 0.162 inch and an outside diameter of 1.25 inches. With a free length of 8 inches, the 603CS offers an initial tension of 23 pounds and a maximum deflection of 3.9 inches. It has a spring rate of 20 inches per pound and a maximum load capacity of 100 pounds force. The 603CS is equipped with machine hook ends and is suitable for a range of extension spring applications.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. Our commitment to providing quality springs extends to our manufacturing process, as all our products, including the 603CS, are proudly made in the United States. With our efficient shipping and ample supply, Century Spring ensures that customers can quickly receive the springs 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 23 lb
Length 8 in
Material High Carbon Steel
Outside Diameter 1.25 in
Part Type Standard
Rate 20 lbs/in
SKU 603CS
Sugg Max Deflection 3.9 in
Sugg Max Load 100 lbf
Wind Direction Left
Wire Diameter 0.162 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 10.43 kg
Length 203.2 mm
Material High Carbon Steel
Outside Diameter 31.75 mm
Part Type Standard
Rate 3.5 N/mm
SKU 603CS
Sugg Max Deflection 99.06 mm
Sugg Max Load 444.8 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 $14.65
50 - 149 $13.92
150 - 299 $13.19
300 - 499 $12.46
500 - 749 $10.99
750 - 999 $9.53
1000+ Call for price