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100 YRS

The Countdown to 100 Years of Century Spring!

Since 1927, Century Spring Corp has been the original industry-leading spring manufacturer for both stock and custom springs. Read about 100 Years of Century Spring here.

167 DAYS

S-646CS - 4 Inch 302/304 Stainless Steel Extension Springs

Inventory:           
Estimated Lead Time

The S-646CS is a regular extension spring manufactured by Century Spring. This spring is made from high-quality 302/304 stainless steel, ensuring durability and corrosion resistance. It has a free length of 4 inches and a maximum deflection of 3.8 inches. With an initial tension of 4 pounds, the S-646CS can provide the necessary force for various applications. Its wire diameter is 0.095 inches, and the outer diameter measures 1 inches. The spring rate is 5.4 inch-pounds, allowing for controlled extension and retraction. With a maximum load capacity of 24 pounds, this spring is reliable and efficient. The S-646CS is designed with machine hooks on both ends, providing secure attachment points. Experience the exceptional performance and reliability of Century Spring's S-646CS extension spring.

At Century Spring, we prioritize customer satisfaction and convenience. We offer fast shipping, ensuring that you receive your springs promptly. With our significant stock inventory, including the S-646CS, you can rely on us to have the springs you need readily available. All of our products are proudly made in the United States, guaranteeing superior quality and craftsmanship. Trust Century Spring for all your spring needs, and experience the ease and reliability of our service.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku S-646CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 0.095 in
F) Outside Diameter 1 in
G) Length 4 in
H) End Type Machine Hook
I) End Position Random
J) Rate 5.4 lbs/in
K) Initial Tension 4 lb
L) Sugg Max Deflection 3.8 in
L) Sugg Max Load 24 lbf
O) Finish None
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku S-646CS
C) Part Type Standard
D) Material 302/304 Stainless Steel
E) Wire Diameter 2.41 mm
F) Outside Diameter 25.4 mm
G) Length 101.6 mm
H) End Type Machine Hook
I) End Position Random
J) Rate 0.95 N/mm
K) Initial Tension 1.81 kg
L) Sugg Max Deflection 96.52 mm
L) Sugg Max Load 106.75 N
O) Finish None