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B3-21CS - 1.63 Inch Spring Steel Extension Springs

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Estimated Lead Time

The B3-21CS is a regular extension spring manufactured by Century Spring. It features machine hook ends and is finished with zinc. This spring has a free length of 1.63 inches and an initial tension of 2 pounds. Made from spring steel, it has a maximum deflection of 0.94 inches and can handle a maximum load of 13 pound force. With an outside diameter of 0.437 inches and a wire diameter of 0.055 inches, the B3-21CS has a spring rate of 11 lbs/inch. Our springs are shipped with a weight of 0.0196 pounds and are wound in a left direction.

Century Spring takes pride in our fast shipping and extensive stock inventory. We are dedicated to providing high-quality products made in the United States, including the B3-21CS spring. With our efficient shipping process and ample supply, we ensure that our customers receive their springs promptly for their projects.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 2 lb
Length 1.63 in
Material Spring Steel
Outside Diameter 0.437 in
Part Type Standard
Rate 11 lbs/in
SKU B3-21CS
Sugg Max Deflection 0.94 in
Sugg Max Load 13 lbf
Wire Diameter 0.055 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.91 kg
Length 41.4 mm
Material Spring Steel
Outside Diameter 11.1 mm
Part Type Standard
Rate 1.93 N/mm
SKU B3-21CS
Sugg Max Deflection 23.88 mm
Sugg Max Load 57.82 N
Wire Diameter 1.4 mm