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S-521CS - 1.25 Inch 302/304 Stainless Steel Extension Springs

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The S-521CS is a regular extension spring manufactured by Century Spring. It is made from 302/304 stainless steel and has a clean, unfinished look. This spring has a wire diameter of 0.02 Inch and an outside diameter of 0.188 inches. It has a free length of 1.25 Inch and a maximum deflection of 1.5 inches. The initial tension of the S-521CS is 0.2 Pound, and it has a spring rate of 0.86 lbs/inch. With a maximum load of 1.5 Pound Force, this extension spring is designed to provide reliable performance. The S-521CS features machine hooks on both ends, making it easy to attach and secure in place.

Century Spring takes pride in offering fast shipping and maintaining a significant stock inventory. We understand the importance of timely delivery and strive to ensure that our customers receive their springs promptly. As a U.S.-based manufacturer, we are committed to producing high-quality products, including the S-521CS, right here in the United States. With our efficient shipping and ample inventory, Century Spring is your reliable source for extension springs that meet your specific needs.

Download CAD
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Ends Machine Hook
Finish None
Initial Tension 0.2 lb
Length 1.25 in
Material 302/304 Stainless Steel
Outside Diameter 0.188 in
Part Type Standard
Rate 0.86 lbs/in
SKU S-521CS
Sugg Max Deflection 1.5 in
Sugg Max Load 1.5 lbf
Wire Diameter 0.02 in
Specs (in metric)
Label Value
Brand Century Spring
Ends Machine Hook
Finish None
Initial Tension 0.09 kg
Length 31.75 mm
Material 302/304 Stainless Steel
Outside Diameter 4.78 mm
Part Type Standard
Rate 0.15 N/mm
SKU S-521CS
Sugg Max Deflection 38.1 mm
Sugg Max Load 6.67 N
Wire Diameter 0.51 mm