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644CS - 3.50 Inch High Carbon Steel Extension Springs

Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours

The 644CS is a regular extension spring manufactured by Century Spring. It is made from High Carbon steel and has a zinc finish. This spring has a free length of 3.5 inches and an outside diameter of 0.437 inches. It has an initial tension of 1.5 pounds and a maximum deflection of 3.6 inches. The 644CS has a rate of 2 lbs/inch and can withstand a maximum load of 8.4 pound force. It is a left-wound spring with a wire diameter of 0.047 inches. This spring is ideal for various extension spring applications.

At Century Spring, we pride ourselves on our fast shipping and extensive stock inventory. We understand the importance of receiving springs promptly for your projects. That's why we offer reliable and efficient shipping services. Additionally, all our products, including the 644CS, are proudly made in the United States. We prioritize quality and craftsmanship in our manufacturing process. With Century Spring, you can trust that you'll receive high-quality springs quickly and efficiently.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 1.5 lb
Length 3.5 in
Material High Carbon Steel
Outside Diameter 0.437 in
Part Type Standard
Rate 2 lbs/in
SKU 644CS
Sugg Max Deflection 3.6 in
Sugg Max Load 8.4 lbf
Wind Direction Left
Wire Diameter 0.047 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 0.68 kg
Length 88.9 mm
Material High Carbon Steel
Outside Diameter 11.1 mm
Part Type Standard
Rate 0.35 N/mm
SKU 644CS
Sugg Max Deflection 91.44 mm
Sugg Max Load 37.36 N
Wind Direction Left
Wire Diameter 1.19 mm