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B12-31CS - 1.13" Music Wire Compression Spring

Inventory Status
Estimated Lead Time

Compression spring manufactured from music wire with 17.5 coils and closed & ground ends. This spring features an O.D. of 0.406", and an I.D. of 0.356".

Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name B12-31
Ends Closed & Ground
Finish None
Free Length 1.13 in
Inside Diameter 0.356 in
Material Music Wire
Outside Diameter 0.406 in
Part Type Standard
Rate 0.66 lbs/in
SKU B12-31CS
Solid Length 0.44 in
Suggested Max Deflection 0.69 in
Suggested Max Load 0.45 lbf
Total Coils 17.5
Wire Diameter 0.025 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name B12-31
Ends Closed & Ground
Finish None
Free Length 28.7 mm
Inside Diameter 9.04 mm
Material Music Wire
Outside Diameter 10.31 mm
Part Type Standard
Rate 0.12 N/mm
SKU B12-31CS
Solid Length 11.18 mm
Suggested Max Deflection 17.53 mm
Suggested Max Load 2 N
Total Coils 17.5
Wire Diameter 0.64 mm
The B12-31CS compression spring is a meticulously engineered component designed for a wide range of industrial applications requiring reliable performance and durability. Crafted from premium 0.025" diameter music wire, the B12-31 spring design exhibits reliable strength across its 17.5 active coils, withstanding repeated compression cycles with a maximum load of 0.45 lbf without succumbing to fatigue.

We manufacture the B12-31 design to provide a compression spring that is 1.13" long at rest and provides a consistent rate of 0.66 lbs/in along its recommended maximum of 0.69" deflection. For best results, your application should fully accommodate the inner (0.356") and outer (0.406") diameters of this spring and be designed for its closed & ground end configuration.