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637CS - 4.50 Inch High Carbon Steel Extension Springs

The 637CS is a regular extension spring manufactured by Century Spring. It features a machine hook on both ends for easy installation. Made from High Carbon steel with a zinc finish, this spring offers durability and corrosion resistance. With a free length of 4.5 inches and an initial tension of 5 pounds, it provides reliable extension capabilities. The 637CS has a maximum deflection of 3.3 inches and a maximum load of 29 pound force. Its outer diameter measures 0.812 inches, and it has a wire diameter of 0.091 inches. With a spring rate of 7.1 inches per pound, it offers the required flexibility for various 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 strive to process orders quickly and efficiently. Additionally, our products, including the 637CS, are proudly made in the United States. By manufacturing locally, we maintain high-quality standards and support domestic manufacturing. With Century Spring, you can count on reliable shipping and a vast selection of springs to meet your project needs.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 5 lb
Length 4.5 in
Material High Carbon Steel
Outside Diameter 0.812 in
Part Type Standard
Rate 7.1 lbs/in
SKU 637CS
Sugg Max Deflection 3.3 in
Sugg Max Load 29 lbf
Wind Direction Left
Wire Diameter 0.091 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 2.27 kg
Length 114.3 mm
Material High Carbon Steel
Outside Diameter 20.62 mm
Part Type Standard
Rate 1.24 N/mm
SKU 637CS
Sugg Max Deflection 83.82 mm
Sugg Max Load 128.99 N
Wind Direction Left
Wire Diameter 2.31 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