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5139CS - 4 Inch Spring Steel Extension Springs

The 5139CS is a regular extension spring manufactured by Century Spring. It is made from spring steel and has a zinc finish. This spring has a wire diameter of 0.225 inches, an outside diameter of 1.625 inches, and a free length of 4 inches. It has an initial tension of 51 Pound and a maximum deflection of 0.99 inches. The 5139CS has a spring rate of 145 inches per pound and a maximum load of 196 Pound Force. It features machine hook ends and a left-hand wind direction. The 5139CS is a reliable extension spring suitable for a variety of applications.

At Century Spring, we take pride in offering fast shipping and maintaining a significant stock inventory. Our products, including the 5139CS, are made right here in the United States. With our efficient shipping process and ample supply of springs, we ensure that our customers receive their orders promptly and can rely on the quality of our American-made products.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 51 lb
Length 4 in
Material Spring Steel
Outside Diameter 1.625 in
Part Type Standard
Rate 145 lbs/in
SKU 5139CS
Sugg Max Deflection 0.99 in
Sugg Max Load 196 lbf
Wind Direction Left
Wire Diameter 0.225 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 23.13 kg
Length 101.6 mm
Material Spring Steel
Outside Diameter 41.28 mm
Part Type Standard
Rate 25.39 N/mm
SKU 5139CS
Sugg Max Deflection 25.15 mm
Sugg Max Load 871.81 N
Wind Direction Left
Wire Diameter 5.72 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $23.59
50 - 149 $22.42
150 - 299 $21.24
300 - 499 $20.06
500 - 749 $17.70
750 - 999 $15.34
1000+ Call for price