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B4-20 - 0.5 Inch, 21 Inch Pounds Spring Steel Compression Spring

Inventory Status
In-stock
Estimated Lead Time
In-stock parts: usually ships in 12-24 hours

Regular compression spring in Spring Steel with 3.25 total coils and Closed & Ground ends. This spring features an O.D. of 0.75 Inch, an I.D. of 0.65 Inch, and a spring rate of 21 Inch Pounds.

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

Unit System
View Spec Sheet
Specs (in standard)
Label Value
Brand Century Spring
Display Name B4-20
Ends Closed & Ground
Finish None
Free Length 0.5 in
Inside Diameter 0.65 in
Material Spring Steel
Outside Diameter 0.75 in
Part Type Standard
Rate 21 lbs/in
SKU B4-20CS
Solid Length 0.16 in
Suggested Max Deflection 0.29 in
Suggested Max Load 6.1 lbf
Total Coils 3.25
Wire Diameter 0.05 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name B4-20
Ends Closed & Ground
Finish None
Free Length 12.7 mm
Inside Diameter 16.51 mm
Material Spring Steel
Outside Diameter 19.05 mm
Part Type Standard
Rate 3.68 N/mm
SKU B4-20CS
Solid Length 4.06 mm
Suggested Max Deflection 7.37 mm
Suggested Max Load 27.13 N
Total Coils 3.25
Wire Diameter 1.27 mm

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