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B1-39CS - 1.38 Inch Music Wire Extension Springs

Inventory Status
Estimated Lead Time

The B1-39CS is a regular extension spring manufactured by Century Spring. It is made from Music Wire and features a black oxide finish. This spring has a wire diameter of 0.026 Inch and an outside diameter of 0.25 inches. The free length of the spring is 1.38 inches, and it has an initial tension of 0.4 Pound. With a maximum deflection of 2 Inch and a maximum load of 3.5 Pound Force, the B1-39CS is a reliable choice for various applications. It has full loop ends, providing secure attachment points.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. This includes the B1-39CS spring, which is manufactured right here in the United States. With our efficient shipping process and ample supply, we ensure that customers can quickly receive the springs they need for their projects. Trust Century Spring for high-quality springs and reliable service.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Full Loop
Finish Black Oxide
Initial Tension 0.4 lb
Length 1.38 in
Material Music Wire
Outside Diameter 0.25 in
Part Type Standard
Rate 1.6 lbs/in
SKU B1-39CS
Sugg Max Deflection 2 in
Sugg Max Load 3.5 lbf
Wind Direction Left
Wire Diameter 0.026 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Full Loop
Finish Black Oxide
Initial Tension 0.18 kg
Length 35.05 mm
Material Music Wire
Outside Diameter 6.35 mm
Part Type Standard
Rate 0.28 N/mm
SKU B1-39CS
Sugg Max Deflection 50.8 mm
Sugg Max Load 15.57 N
Wind Direction Left
Wire Diameter 0.66 mm