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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

B9-3CS - 3.91 Inch Spring Steel Extension Springs

Inventory:           
Estimated Lead Time

The B9-3CS is a regular extension spring manufactured by Century Spring. It is made from spring steel and features a zinc finish for added durability. This spring has a free length of 3.91 inches and an initial tension of 1 pound. With a maximum deflection of 7 inches and a maximum load capacity of 10 pounds, the B9-3CS is a reliable and versatile extension spring. Its outside diameter measures 0.75 inches, and it has a wire diameter of 0.0625 inches. The B9-3CS is designed with full loop ends, making it easy to install and secure. It is a standard-sized spring suitable for a wide range of applications.

At Century Spring, we pride ourselves on our fast shipping and extensive stock inventory. We understand the importance of promptly receiving the springs you need for your projects. That's why we offer reliable shipping services to ensure timely delivery. Additionally, all our springs, including the B9-3CS, are proudly made in the United States. We prioritize quality and craftsmanship in our manufacturing processes, guaranteeing that you receive high-quality springs for your applications. With Century Spring, you can count on efficient shipping and a vast selection of springs to meet your needs.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku B9-3CS
C) Part Type Standard
D) Material Spring Steel
E) Wire Diameter 0.0625 in
F) Outside Diameter 0.75 in
G) Length 3.91 in
H) End Type Full Loop
I) End Position Random
J) Rate 1.3 lbs/in
K) Initial Tension 1 lb
L) Sugg Max Deflection 7 in
L) Sugg Max Load 10 lbf
O) Finish Zinc
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku B9-3CS
C) Part Type Standard
D) Material Spring Steel
E) Wire Diameter 1.59 mm
F) Outside Diameter 19.05 mm
G) Length 99.31 mm
H) End Type Full Loop
I) End Position Random
J) Rate 0.23 N/mm
K) Initial Tension 0.45 kg
L) Sugg Max Deflection 177.8 mm
L) Sugg Max Load 44.48 N
O) Finish Zinc