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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

B3-21CS - 1.63 Inch Spring Steel Extension Springs

Inventory:           
Estimated Lead Time

The B3-21CS is a regular extension spring manufactured by Century Spring. It features machine hook ends and is finished with zinc. This spring has a free length of 1.63 inches and an initial tension of 2 pounds. Made from spring steel, it has a maximum deflection of 0.94 inches and can handle a maximum load of 13 pound force. With an outside diameter of 0.437 inches and a wire diameter of 0.055 inches, the B3-21CS has a spring rate of 11 lbs/inch. Our springs are shipped with a weight of 0.0196 pounds and are wound in a left direction.

Century Spring takes pride in our fast shipping and extensive stock inventory. We are dedicated to providing high-quality products made in the United States, including the B3-21CS spring. With our efficient shipping process and ample supply, we ensure that our customers receive their springs promptly for their projects.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku B3-21CS
C) Part Type Standard
D) Material Spring Steel
E) Wire Diameter 0.055 in
F) Outside Diameter 0.437 in
G) Length 1.63 in
H) End Type Machine Hook
I) End Position Random
J) Rate 11 lbs/in
K) Initial Tension 2 lb
L) Sugg Max Deflection 0.94 in
L) Sugg Max Load 13 lbf
O) Finish Zinc
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku B3-21CS
C) Part Type Standard
D) Material Spring Steel
E) Wire Diameter 1.4 mm
F) Outside Diameter 11.1 mm
G) Length 41.4 mm
H) End Type Machine Hook
I) End Position Random
J) Rate 1.93 N/mm
K) Initial Tension 0.91 kg
L) Sugg Max Deflection 23.88 mm
L) Sugg Max Load 57.82 N
O) Finish Zinc