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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

B5-31CS - 2.03 Inch Spring Steel Extension Springs

Inventory:           
Estimated Lead Time

The B5-31CS is a regular extension spring manufactured by Century Spring. It is made from spring steel and has a gold iridite finish. This spring has a wire diameter of 0.04 inches, an outside diameter of 0.359 inches, and a free length of 2.03 inches. It has an initial tension of 1 Pound and a maximum deflection of 1.9 inches. The B5-31CS has a spring rate of 2.8 lbs/inch and a maximum load of 6.4 Pound Force. It features machine hooks on both ends for easy installation. This extension spring is suitable for a variety of applications.

At Century Spring, we pride ourselves on fast shipping and maintaining a significant stock inventory. We understand the importance of timely delivery, which is why we offer efficient shipping options to ensure our customers receive their springs quickly. Additionally, we are committed to supporting American manufacturing. All of our springs, including the B5-31CS, are proudly made in the United States. With our reliable shipping and ample supply, Century Spring is your go-to source for high-quality springs for your projects.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku B5-31CS
C) Part Type Standard
D) Material Spring Steel
E) Wire Diameter 0.04 in
F) Outside Diameter 0.359 in
G) Length 2.03 in
H) End Type Machine Hook
I) End Position Random
J) Rate 2.8 lbs/in
K) Initial Tension 1 lb
L) Sugg Max Deflection 1.9 in
L) Sugg Max Load 6.4 lbf
O) Finish Gold Iridite
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku B5-31CS
C) Part Type Standard
D) Material Spring Steel
E) Wire Diameter 1.02 mm
F) Outside Diameter 9.12 mm
G) Length 51.56 mm
H) End Type Machine Hook
I) End Position Random
J) Rate 0.49 N/mm
K) Initial Tension 0.45 kg
L) Sugg Max Deflection 48.26 mm
L) Sugg Max Load 28.47 N
O) Finish Gold Iridite