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645CS - 6 Inch High Carbon Steel Extension Springs

The 645CS is a regular extension spring manufactured by Century Spring. It is made from High Carbon steel and features a zinc finish. This spring has a free length of 6 inches and an initial tension of 1 pound. It has an outside diameter of 0.25 inch and can handle a maximum load of 6 pounds of force. With a max deflection of 4.3 inches and a spring rate of 1.1 inches per pound, the 645CS is a reliable choice for various applications that require extension springs.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of quick turnaround times, so we ensure that our products, including the 645CS, are promptly delivered to our customers. Additionally, all our springs are proudly made in the United States, so you can trust in their quality and durability. With Century Spring, you can count on efficient shipping and a vast selection of springs for your project needs.

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 1 lb
Length 6 in
Material High Carbon Steel
Outside Diameter 0.25 in
Part Type Standard
Rate 1.1 lbs/in
SKU 645CS
Sugg Max Deflection 4.3 in
Sugg Max Load 6 lbf
Wind Direction Left
Wire Diameter 0.034 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish Zinc
Initial Tension 0.45 kg
Length 152.4 mm
Material High Carbon Steel
Outside Diameter 6.35 mm
Part Type Standard
Rate 0.19 N/mm
SKU 645CS
Sugg Max Deflection 109.22 mm
Sugg Max Load 26.69 N
Wind Direction Left
Wire Diameter 0.86 mm
Inventory Status
Low Stock
Quantity Price
1 - 49 $4.44
50 - 149 $4.22
150 - 299 $4.00
300 - 499 $3.78
500 - 749 $3.33
750 - 999 $2.89
1000+ Call for price