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648CS - 5.75 Inch High Carbon Steel Extension Springs

The 648CS is a regular extension spring manufactured by Century Spring. It is made from High Carbon steel and features a black oxide finish. This spring has a free length of 5.75 inches and an initial tension of 107 pounds. It has an outside diameter of 1.375 inches and a wire diameter of 0.243 inches. With a spring rate of 209 inches per pound and a maximum deflection of 0.97 inches, the 648CS is a reliable and sturdy spring suitable for a variety of applications.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of prompt delivery, which is why we ensure that our products, including the 648CS, are readily available and ready to ship. Additionally, all our springs are proudly made in the United States, guaranteeing quality craftsmanship and supporting local manufacturing. With Century Spring, you can trust that you'll receive your springs quickly and have access to a wide range of high-quality products for your projects.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Black Oxide
Initial Tension 107 lb
Length 5.75 in
Material High Carbon Steel
Outside Diameter 1.375 in
Part Type Standard
Rate 209 lbs/in
SKU 648CS
Sugg Max Deflection 0.97 in
Sugg Max Load 310 lbf
Wind Direction Left
Wire Diameter 0.243 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Black Oxide
Initial Tension 48.53 kg
Length 146.05 mm
Material High Carbon Steel
Outside Diameter 34.93 mm
Part Type Standard
Rate 36.6 N/mm
SKU 648CS
Sugg Max Deflection 24.64 mm
Sugg Max Load 1378.88 N
Wind Direction Left
Wire Diameter 6.17 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $24.87
50 - 149 $23.63
150 - 299 $22.39
300 - 499 $21.14
500 - 749 $18.66
750 - 999 $16.17
1000+ Call for price