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139CS - 8.50 Inch High Carbon Steel Extension Springs

The 139CS is a regular extension spring manufactured by Century Spring. It is made from High Carbon steel and features a zinc finish for added durability. This spring has a wire diameter of 0.105 inch and an outside diameter of 0.875 inches. With a free length of 8.5 inches, it provides an initial tension of 9.2 pounds. The 139CS has a maximum deflection of 6.1 inches and a maximum load capacity of 41 pound force. It is designed with machine hook ends and has a spring rate of 5.4 inches per pound. This standard size extension spring is 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 timely delivery, which is why we strive to get your springs to you quickly. Our products, including the 139CS, are proudly made in the United States, ensuring high-quality craftsmanship. Whether you need springs for industrial or residential use, Century Spring has you covered. Trust us for reliable shipping and a wide selection of springs to meet your needs.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 9.2 lb
Length 8.5 in
Material High Carbon Steel
Outside Diameter 0.875 in
Part Type Standard
Rate 5.4 lbs/in
SKU 139CS
Sugg Max Deflection 6.1 in
Sugg Max Load 41 lbf
Wind Direction Left
Wire Diameter 0.105 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 4.17 kg
Length 215.9 mm
Material High Carbon Steel
Outside Diameter 22.23 mm
Part Type Standard
Rate 0.95 N/mm
SKU 139CS
Sugg Max Deflection 154.94 mm
Sugg Max Load 182.37 N
Wind Direction Left
Wire Diameter 2.67 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $10.25
50 - 149 $9.74
150 - 299 $9.23
300 - 499 $8.72
500 - 749 $7.69
750 - 999 $6.67
1000+ Call for price