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B3-4CS - 0.75 Inch Music Wire Extension Springs

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The B3-4CS is a regular extension spring manufactured by Century Spring. It is made from high-quality music wire and has a natural finish. This spring has a wire diameter of 0.021 inch and an outside diameter of 0.172 inches. Its free length measures 0.75 inches, and it has an initial tension of 0.3 pound. The B3-4CS has a maximum deflection of 0.84 inch and can withstand a maximum load of 2.9 pound force. It features extended hook ends and a left wind direction. With a spring rate of 3 lbs/inch, this extension spring is suitable for a wide range 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 ensure that our products, including the B3-4CS, are readily available for immediate shipment. Additionally, all our springs are proudly made in the United States, guaranteeing top-notch quality and craftsmanship. With Century Spring, you can rely on us to provide you with the springs you need, when you need them.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Extended Hook
Finish None
Initial Tension 0.3 lb
Length 0.75 in
Material Music Wire
Outside Diameter 0.172 in
Part Type Standard
Rate 3 lbs/in
SKU B3-4CS
Sugg Max Deflection 0.84 in
Sugg Max Load 2.9 lbf
Wire Diameter 0.021 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Extended Hook
Finish None
Initial Tension 0.14 kg
Length 19.05 mm
Material Music Wire
Outside Diameter 4.37 mm
Part Type Standard
Rate 0.53 N/mm
SKU B3-4CS
Sugg Max Deflection 21.34 mm
Sugg Max Load 12.9 N
Wire Diameter 0.53 mm