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581CS - 3.19 Inch Spring Steel Extension Springs

The 581CS is a regular extension spring manufactured by Century Spring. It features a machine hook on both ends and is made from spring steel with a zinc finish. This spring has a free length of 3.19 inches and an initial tension of 5 pounds. With a maximum deflection of 1.2 inches and a maximum load capacity of 22 pound force, it is suitable for a variety of applications. The 581CS has an outside diameter of 0.406 inches and a wire diameter of 0.0625 inches. Its spring rate is 13 inches per pound.

Century Spring takes pride in offering fast shipping and maintaining a significant stock inventory. We understand the importance of timely delivery, and our robust inventory ensures that customers can easily find the springs they need. In addition, all our products, including the 581CS, are proudly made in the United States. With Century Spring, you can rely on top-quality springs made with precision and shipped swiftly to meet your project requirements.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 5 lb
Length 3.19 in
Material Spring Steel
Outside Diameter 0.406 in
Part Type Standard
Rate 13 lbs/in
SKU 581CS
Sugg Max Deflection 1.2 in
Sugg Max Load 22 lbf
Wind Direction Left
Wire Diameter 0.0625 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 2.27 kg
Length 81.03 mm
Material Spring Steel
Outside Diameter 10.31 mm
Part Type Standard
Rate 2.28 N/mm
SKU 581CS
Sugg Max Deflection 30.48 mm
Sugg Max Load 97.86 N
Wind Direction Left
Wire Diameter 1.59 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $4.09
50 - 149 $3.89
150 - 299 $3.69
300 - 499 $3.48
500 - 749 $3.07
750 - 999 $2.66
1000+ Call for price