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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 Stainless Steel

Outside Diameter

 N/A 0.75

Wire Diameter

 N/A 0.105

Free Length

 N/A 3.500

Max. Load

 N/A 53.5

Max. Extension

 N/A 5.06

Initial Tension

 N/A 7.4

Spring Rate

 N/A 29.50

Max. Load (SS)

 N/A 45.900

Max. Extension (SS)

 N/A 5.04

Initial Tension (SS)

 N/A 6.4

Spring Rate (SS)

 N/A 25.7