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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.

198 DAYS

81021CS - 5.50 Inch Music Wire Extension Springs

Inventory:           
Estimated Lead Time

The 81021CS is a regular extension spring manufactured by Century Spring. It is made from high-quality music wire and has a durable finish. This spring has a wire diameter of 0.125 inches, an outside diameter of 1 inches, and a free length of 5.5 inches. It has an initial tension of 6 Pound and a maximum deflection of 3.8 inches. With a maximum load capacity of 73 Pound Force, this spring is suitable for a variety of applications. The 81021CS features full loop ends, providing secure attachment points. It is a reliable and versatile extension spring that meets industry standards.

At Century Spring, we take pride in our fast shipping and extensive inventory. We understand the importance of timely delivery and strive to ensure that our customers receive their springs promptly. With our significant stock, including the 81021CS, we can meet the demands of various projects and industries. Additionally, all our springs are proudly made in the United States, ensuring top-notch quality and supporting local manufacturing. Trust Century Spring for reliable, high-performance springs backed by our commitment to customer satisfaction and efficient service.

Download CAD
Unit System
Specs (in standard)
Label Value
A) Brand Century Spring
B) Sku 81021CS
C) Part Type Standard
D) Material Music Wire
E) Wire Diameter 0.125 in
F) Outside Diameter 1 in
G) Length 5.5 in
H) End Type Full Loop
I) End Position Random
J) Rate 18 lbs/in
K) Initial Tension 6 lb
L) Sugg Max Deflection 3.8 in
L) Sugg Max Load 73 lbf
O) Finish None
Specs (in metric)
Label Value
A) Brand Century Spring
B) Sku 81021CS
C) Part Type Standard
D) Material Music Wire
E) Wire Diameter 3.18 mm
F) Outside Diameter 25.4 mm
G) Length 139.7 mm
H) End Type Full Loop
I) End Position Random
J) Rate 3.15 N/mm
K) Initial Tension 2.72 kg
L) Sugg Max Deflection 96.52 mm
L) Sugg Max Load 324.7 N
O) Finish None