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

Extension

Material

Music Wire

Outside Diameter

0.36

Wire Diameter

0.058

Free Length

2.250

Max. Load

20.5

Max. Extension

3.13

Initial Tension

3

Spring Rate

20.10

Max. Load (SS)

17.700

Max. Extension (SS)

3.12

Initial Tension (SS)

2.5

Spring Rate (SS)

17.5