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5421CS - 0.44 Inch Music Wire Extension Springs

The 5421CS is a regular extension spring manufactured by Century Spring. It features machine hook ends and is made from durable music wire material. With a free length of 0.44 inch and an outside diameter of 0.14 inches, this spring offers a maximum deflection of 0.49 inch and a maximum load of 1.1 pound force. Its initial tension is set at 0.1 pound, providing reliable performance for various applications. The 5421CS has a spring rate of 2.1 inches per pound and is wound in a left direction. Century Spring takes pride in producing high-quality springs, including the 5421CS, ensuring that customers receive top-notch products for their projects.

Century Spring offers fast shipping and maintains a significant stock inventory. We understand the importance of quick delivery and strive to provide efficient service to our customers. With our ample supply of springs, including the 5421CS, you can count on us to meet your needs promptly. Additionally, all our springs are proudly made in the United States, ensuring superior quality and supporting local manufacturing. Trust Century Spring for reliable shipping, extensive stock, and top-notch American-made springs.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish None
Initial Tension 0.1 lb
Length 0.44 in
Material Music Wire
Outside Diameter 0.14 in
Part Type Standard
Rate 2.1 lbs/in
SKU 5421CS
Sugg Max Deflection 0.49 in
Sugg Max Load 1.1 lbf
Wind Direction Left
Wire Diameter 0.014 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish None
Initial Tension 0.05 kg
Length 11.18 mm
Material Music Wire
Outside Diameter 3.56 mm
Part Type Standard
Rate 0.37 N/mm
SKU 5421CS
Sugg Max Deflection 12.45 mm
Sugg Max Load 4.89 N
Wind Direction Left
Wire Diameter 0.36 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours

Pricing reflects the base un-configured part price. Final per piece price including configured options will be calculated once a quantity is entered in the field above.

Quantity Price
1 - 49 $2.03
50 - 149 $1.93
150 - 299 $1.83
300 - 499 $1.73
500 - 749 $1.53
750 - 999 $1.32
1000+ Call for price