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150CS - 4 Inch Spring Steel Extension Springs

The 150CS is a regular extension spring manufactured by Century Spring. It features machine hook ends and is finished with zinc coating for added durability. With a free length of 4 inches and an initial tension of 0.5 pounds, this spring is made from high-quality spring steel. It has a maximum deflection of 7.3 inches and can withstand a maximum load of 3.9 pounds force. The 150CS has an outside diameter of 0.375 inches and a wire diameter of 0.034 inches. Its spring rate is 0.47 inches per pound. This standard extension spring is suitable for various applications.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of timely delivery, which is why we ensure that our products, including the 150CS, reach our customers quickly. Additionally, all our springs are proudly made in the United States, guaranteeing their quality and reliability. With Century Spring, you can count on receiving the springs you need for your projects promptly and with confidence.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.5 lb
Length 4 in
Material Spring Steel
Outside Diameter 0.375 in
Part Type Standard
Rate 0.47 lbs/in
SKU 150CS
Sugg Max Deflection 7.3 in
Sugg Max Load 3.9 lbf
Wind Direction Left
Wire Diameter 0.034 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.23 kg
Length 101.6 mm
Material Spring Steel
Outside Diameter 9.53 mm
Part Type Standard
Rate 0.08 N/mm
SKU 150CS
Sugg Max Deflection 185.42 mm
Sugg Max Load 17.35 N
Wind Direction Left
Wire Diameter 0.86 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $3.98
50 - 149 $3.79
150 - 299 $3.59
300 - 499 $3.39
500 - 749 $2.99
750 - 999 $2.59
1000+ Call for price