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Selection
Extension Springs are organized in order of increasing diameter and wire size. Note that in each category the spring rate decreases as the length increases.
Unit of Measure

Specifications

Type

 N/A Extension

Material

 N/A Music Wire

Outside Diameter

 N/A 0.75

Wire Diameter

 N/A 0.063

Free Length

 N/A 4.000

Max. Load

 N/A 12.9

Max. Extension

 N/A 11.35

Initial Tension

 N/A 0.9

Spring Rate

 N/A 1.60

Max. Load (SS)

 N/A 11.200

Max. Extension (SS)

 N/A 11.33

Initial Tension (SS)

 N/A 0.8

Spring Rate (SS)

 N/A 1.4