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B6-4CS - 1.38 Inch Music Wire Extension Springs

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The B6-4CS is a regular extension spring manufactured by Century Spring. It is made from Music Wire and has no finish. This spring has a wire diameter of 0.018 Inch and an outside diameter of 0.125 inches. It has a free length of 1.38 Inch and an initial tension of 0.4 Pound. The B6-4CS has a maximum deflection of 1.2 Inch and can handle a maximum load of 2.5 Pound Force. It is a left-wind spring with full-loop ends. The B6-4CS is a standard extension spring suitable for a variety of applications.

At Century Spring, we understand the importance of fast shipping and maintaining a significant stock inventory. We are proud to offer both. Our products, including the B6-4CS, are made right here in the United States. With our reliable shipping and ample supply, Century Spring ensures that customers can quickly receive the springs they need for their projects.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish None
Initial Tension 0.4 lb
Length 1.38 in
Material Music Wire
Outside Diameter 0.125 in
Part Type Standard
Rate 1.8 lbs/in
SKU B6-4CS
Sugg Max Deflection 1.2 in
Sugg Max Load 2.5 lbf
Wire Diameter 0.018 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish None
Initial Tension 0.18 kg
Length 35.05 mm
Material Music Wire
Outside Diameter 3.18 mm
Part Type Standard
Rate 0.32 N/mm
SKU B6-4CS
Sugg Max Deflection 30.48 mm
Sugg Max Load 11.12 N
Wire Diameter 0.46 mm