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12351CS - 12 Inch Spring Steel Extension Springs

The 12351CS is a regular extension spring manufactured by Century Spring. This spring is made from spring steel and has a zinc finish. It has a free length of 12 inches and an initial tension of 4 pounds. The maximum deflection of this spring is 8.6 inches, and it can handle a maximum load of 19 pound force. The outside diameter is 0.5 inches, and the wire diameter is 0.065 inches. The 12351CS is a left wind spring with double loop ends. It has a spring rate of 1.8 inches per pound.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. Our products, including the 12351CS, are made in the United States. With our efficient shipping process and ample supply, we ensure that our customers receive their springs promptly for their projects.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Double Loop
Finish Zinc
Initial Tension 4 lb
Length 12 in
Material Spring Steel
Outside Diameter 0.5 in
Part Type Standard
Rate 1.8 lbs/in
SKU 12351CS
Sugg Max Deflection 8.6 in
Sugg Max Load 19 lbf
Wind Direction Left
Wire Diameter 0.065 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Double Loop
Finish Zinc
Initial Tension 1.81 kg
Length 304.8 mm
Material Spring Steel
Outside Diameter 12.7 mm
Part Type Standard
Rate 0.32 N/mm
SKU 12351CS
Sugg Max Deflection 218.44 mm
Sugg Max Load 84.51 N
Wind Direction Left
Wire Diameter 1.65 mm
Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours
Quantity Price
1 - 49 $6.79
50 - 149 $6.46
150 - 299 $6.12
300 - 499 $5.78
500 - 749 $5.10
750 - 999 $4.42
1000+ Call for price