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221CS - 5.50 Inch High Carbon Steel Extension Springs

The 221CS 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 0.0625 inch and an outside diameter of 0.375 inches. It has a free length of 5.5 inches and an initial tension of 6 pounds. The maximum deflection of the 221CS is 1.9 inches, and it can withstand a maximum load of 23 pound force. With a spring rate of 8.9 inches per pound, this extension spring is ideal for various applications that require controlled tension and flexibility.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of timely delivery, and our efficient shipping process ensures that customers receive their springs promptly. Additionally, our significant stock inventory means that we have ample supply of the 221CS and other springs to meet our customers' needs. As an American company, we are committed to producing high-quality products, and all our springs, including the 221CS, are proudly made in the United States. With Century Spring, you can rely on reliable shipping, abundant stock, and domestically manufactured springs for your projects.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 6 lb
Length 5.5 in
Material High Carbon Steel
Outside Diameter 0.375 in
Part Type Standard
Rate 8.9 lbs/in
SKU 221CS
Sugg Max Deflection 1.9 in
Sugg Max Load 23 lbf
Wind Direction Left
Wire Diameter 0.0625 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish Zinc
Initial Tension 2.72 kg
Length 139.7 mm
Material High Carbon Steel
Outside Diameter 9.53 mm
Part Type Standard
Rate 1.56 N/mm
SKU 221CS
Sugg Max Deflection 48.26 mm
Sugg Max Load 102.3 N
Wind Direction Left
Wire Diameter 1.59 mm
Inventory Status
Low Stock
Quantity Price
1 - 49 $4.38
50 - 149 $4.17
150 - 299 $3.95
300 - 499 $3.73
500 - 749 $3.29
750 - 999 $2.85
1000+ Call for price