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12371CS - 3.75 Inch Spring Steel Extension Springs

The 12371CS is a regular extension spring manufactured by Century Spring. It is made from spring steel and has a zinc finish. This spring has a wire diameter of 0.073 inches, an outside diameter of 0.593 inches, and a free length of 3.75 inches. It has an initial tension of 4 Pound and a maximum deflection of 2.5 inches. The 12371CS has a spring rate of 6.8 inches per pound and can handle a maximum load of 21 Pound Force. It is equipped with machine hook ends and winds in the left direction.

At Century Spring, we offer fast shipping and maintain a significant stock inventory. Our springs, including the 12371CS, are proudly made in the United States. With our dependable shipping and ample supply, Century Spring ensures that customers can promptly receive the springs they need for their projects.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 4 lb
Length 3.75 in
Material Spring Steel
Outside Diameter 0.593 in
Part Type Standard
Rate 6.8 lbs/in
SKU 12371CS
Sugg Max Deflection 2.5 in
Sugg Max Load 21 lbf
Wind Direction Left
Wire Diameter 0.073 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 1.81 kg
Length 95.25 mm
Material Spring Steel
Outside Diameter 15.06 mm
Part Type Standard
Rate 1.19 N/mm
SKU 12371CS
Sugg Max Deflection 63.5 mm
Sugg Max Load 93.41 N
Wind Direction Left
Wire Diameter 1.85 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $5.72
50 - 149 $5.44
150 - 299 $5.15
300 - 499 $4.87
500 - 749 $4.29
750 - 999 $3.72
1000+ Call for price