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Century Spring

3921CS - 3.75" Spring Steel Compression Spring

Inventory Status
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Compression spring manufactured from spring steel with 39 coils and closed & ground ends. This spring features an O.D. of 0.375", and an I.D. of 0.247".

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Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 3921
Ends Closed & Ground
Finish Zinc
Free Length 3.75 in
Inside Diameter 0.247 in
Material Spring Steel
Outside Diameter 0.375 in
Part Type Standard
Rate 22 lbs/in
SKU 3921CS
Solid Length 2.5 in
Suggested Max Deflection 1.1 in
Suggested Max Load 24 lbf
Total Coils 39
Wire Diameter 0.064 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 3921
Ends Closed & Ground
Finish Zinc
Free Length 95.25 mm
Inside Diameter 6.27 mm
Material Spring Steel
Outside Diameter 9.53 mm
Part Type Standard
Rate 3.85 N/mm
SKU 3921CS
Solid Length 63.5 mm
Suggested Max Deflection 27.94 mm
Suggested Max Load 106.75 N
Total Coils 39
Wire Diameter 1.63 mm
The 3921 compression spring is engineered for optimal performance in demanding applications. Constructed from high-quality spring steel and designed with precision and durability in mind, this spring is an essential component for a variety of mechanical systems where reliable force and resilience are paramount.

The 3921CS compression spring is designed with a free length of 0.44" total of 4 coils, and a rate of 36 lbs/in providing a balanced combination of flexibility and strength. This spring coil, and its closed end configuration allows for efficient energy storage and release, making it suitable for applications requiring precise motion control.

The 3921 spring design is ideal for use in industrial machinery, automotive systems, and various mechanical assemblies where reliable force application is crucial. Its robust construction and thoughtful design make it a dependable choice for engineers seeking a high-performance spring solution.

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