This browser is no longer supported. Upgrade to Microsoft Edge or switch to a supported browser, like Chrome, Safari, or Firefox, to explore the MW Components website.

We're sorry for the inconvenience.

12387CS - 3.75 Inch Spring Steel Extension Springs

The 12387CS 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 0.121 inches, an outside diameter of 0.953 inches, and a free length of 3.75 inches. It has an initial tension of 12 Pound and a maximum deflection of 1.9 inches. The 12387CS has a spring rate of 24 inches per pound and a maximum load of 57 Pound Force. It features machine hook ends and a left wind direction. This extension spring is suitable for a variety of applications.

At Century Spring, we are proud to offer fast shipping and maintain a significant stock inventory. Our springs, including the 12387CS, are made in the United States. With our efficient shipping and ample supply, we ensure that our customers can quickly receive the high-quality 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 12 lb
Length 3.75 in
Material Spring Steel
Outside Diameter 0.953 in
Part Type Standard
Rate 24 lbs/in
SKU 12387CS
Sugg Max Deflection 1.9 in
Sugg Max Load 57 lbf
Wind Direction Left
Wire Diameter 0.121 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 5.44 kg
Length 95.25 mm
Material Spring Steel
Outside Diameter 24.21 mm
Part Type Standard
Rate 4.2 N/mm
SKU 12387CS
Sugg Max Deflection 48.26 mm
Sugg Max Load 253.54 N
Wind Direction Left
Wire Diameter 3.07 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $6.27
50 - 149 $5.96
150 - 299 $5.65
300 - 499 $5.33
500 - 749 $4.71
750 - 999 $4.08
1000+ Call for price