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S-643CS - 3.69 Inch 302/304 Stainless Steel Extension Springs

Inventory Status
Estimated Lead Time

The S-643CS is a regular extension spring manufactured by Century Spring. It features machine hook ends and is made from 302/304 stainless steel. With a free length of 3.69 inches and a wire diameter of 0.095 inches, this spring offers a maximum deflection of 1.3 inches and a maximum load of 42 pounds. Its spring rate is 24 lbs/inch. The S-643CS has a left wind direction and an outside diameter of 0.625 inches. This standard-sized spring is perfect for a wide range of applications.

At Century Spring, we take pride in our fast shipping and extensive stock inventory. We understand the importance of timely delivery, which is why we ensure prompt shipment of our products, including the S-643CS. Additionally, all our springs are proudly made in the United States. With our reliable shipping and ample supply, Century Spring is dedicated to providing our customers with the springs they need for their projects.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish None
Initial Tension 11 lb
Length 3.69 in
Material 302/304 Stainless Steel
Outside Diameter 0.625 in
Part Type Standard
Rate 24 lbs/in
SKU S-643CS
Sugg Max Deflection 1.3 in
Sugg Max Load 42 lbf
Wind Direction Left
Wire Diameter 0.095 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish None
Initial Tension 4.99 kg
Length 93.73 mm
Material 302/304 Stainless Steel
Outside Diameter 15.88 mm
Part Type Standard
Rate 4.2 N/mm
SKU S-643CS
Sugg Max Deflection 33.02 mm
Sugg Max Load 186.82 N
Wind Direction Left
Wire Diameter 2.41 mm