Compression Springs Regular

3905CS - 0.63" Spring Steel Compression Spring

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Compression spring manufactured from spring steel with 4 coils and closed & ground ends. This spring features an O.D. of 0.5", and an I.D. of 0.41".

NOTE: The spring rate value for compression springs with 4 coils or less is a reference value.

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Standard

Metric

Specs (in standard)
Label	Value
Brand	Century Spring
Display Name	3905
Ends	Closed & Ground
Finish	Zinc
Free Length	0.63 in
Inside Diameter	0.41 in
Material	Spring Steel
Outside Diameter	0.5 in
Part Type	Standard
Rate	31 lbs/in
SKU	3905CS
Solid Length	0.18 in
Suggested Max Deflection	0.23 in
Suggested Max Load	7 lbf
Total Coils	4
Wire Diameter	0.045 in

Specs (in metric)
Label	Value
Brand	Century Spring
Display Name	3905
Ends	Closed & Ground
Finish	Zinc
Free Length	16 mm
Inside Diameter	10.41 mm
Material	Spring Steel
Outside Diameter	12.7 mm
Part Type	Standard
Rate	5.43 N/mm
SKU	3905CS
Solid Length	4.57 mm
Suggested Max Deflection	5.84 mm
Suggested Max Load	31.14 N
Total Coils	4
Wire Diameter	1.14 mm

The 3905 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 3905CS compression spring is designed with a free length of 1.75" total of 11 coils, and a rate of 0.57 lbs/in providing a balanced combination of flexibility and strength. This spring coil, and its closed & ground end configuration allows for efficient energy storage and release, making it suitable for applications requiring precise motion control.

The 3905 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.