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12397CS - 5.75 Inch Spring Steel Extension Springs

The 12397CS is a regular extension spring manufactured by Century Spring. It features a zinc finish for added durability and is made from high-quality spring steel. This spring has a free length of 5.75 inches and an initial tension of 9 pounds. With a maximum deflection of 3.3 inches and a maximum load of 40 pounds, it is suitable for a range of applications. The 12397CS has an outside diameter of 0.75 inches and a wire diameter of 0.098 inches. Its spring rate is 9.5 inch-pounds, providing reliable performance. With its left wind direction and machine hook ends, this extension spring is designed for easy installation and secure attachment.

At Century Spring, we understand the importance of fast shipping and a robust stock inventory. We take pride in offering quick delivery of our products, including the 12397CS spring. As a U.S.-based manufacturer, we prioritize quality and craftsmanship in all our springs. Whether you're working on a small project or a large-scale application, you can rely on Century Spring for prompt and efficient service. With our extensive inventory and commitment to customer satisfaction, we strive to meet your spring needs with ease and reliability.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 9 lb
Length 5.75 in
Material Spring Steel
Outside Diameter 0.75 in
Part Type Standard
Rate 9.5 lbs/in
SKU 12397CS
Sugg Max Deflection 3.3 in
Sugg Max Load 40 lbf
Wind Direction Left
Wire Diameter 0.098 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 4.08 kg
Length 146.05 mm
Material Spring Steel
Outside Diameter 19.05 mm
Part Type Standard
Rate 1.66 N/mm
SKU 12397CS
Sugg Max Deflection 83.82 mm
Sugg Max Load 177.92 N
Wind Direction Left
Wire Diameter 2.49 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $5.21
50 - 149 $4.95
150 - 299 $4.69
300 - 499 $4.43
500 - 749 $3.91
750 - 999 $3.39
1000+ Call for price