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Century Spring

B18-139CS - 0.69" Spring Steel Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from spring steel with 7 coils and closed & ground ends. This spring features an O.D. of 0.25", and an I.D. of 0.178".

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Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name B18-139
Ends Closed & Ground
Finish Zinc
Free Length 0.69 in
Inside Diameter 0.178 in
Material Spring Steel
Outside Diameter 0.25 in
Part Type Standard
Rate 49 lbs/in
SKU B18-139CS
Solid Length 0.25 in
Suggested Max Deflection 0.14 in
Suggested Max Load 7 lbf
Total Coils 7
Wire Diameter 0.036 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name B18-139
Ends Closed & Ground
Finish Zinc
Free Length 17.53 mm
Inside Diameter 4.52 mm
Material Spring Steel
Outside Diameter 6.35 mm
Part Type Standard
Rate 8.58 N/mm
SKU B18-139CS
Solid Length 6.35 mm
Suggested Max Deflection 3.56 mm
Suggested Max Load 31.14 N
Total Coils 7
Wire Diameter 0.91 mm
The B18-139CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.036" diameter spring steel, the B18-139 spring design exhibits reliable strength across its 7 active coils, withstanding repeated compression cycles with a maximum load of 7 lbf without succumbing to fatigue.

We manufacture the B18-139 design to provide a compression spring that is 0.69" long at rest and provides a consistent rate of 49 lbs/in along its recommended maximum of 0.14" deflection. For best results, your application should fully accommodate the inner (0.178") and outer (0.25") diameters of this spring and be designed for its closed & ground end configuration.

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