| Small Extension springs | 
|
| OD: 0.18" OD | |
| Wire Diam: 0.029" | |
| Free length: 1" | |
| Load at length (1.43"): 5.82 lb [25.89 N] | |
| Initial Tension: 0.52 lb [2.31 N] | |
| Spring rate, k :12.2 lb/in [2.14 N/mm] |
Note: The springs available in the kit may not be the same as the following springs. You should verify all data with bench level experiments.
| Small Extension springs |
|
| OD: 0.18" OD | |
| Wire Diam: 0.029" | |
| Free length: 1" | |
| Load at length (1.43"): 5.82 lb [25.89 N] | |
| Initial Tension: 0.52 lb [2.31 N] | |
| Spring rate, k :12.2 lb/in [2.14 N/mm] |
| Medium Extension springs | 
|
| 0.18" OD, 2.47" extended length | |
| 0.024" dia. Music Wire (ASTM-A228) | |
| Free length - 1.37" | |
| Load at length (2.47") - 3.45 lb [15.35 N] | |
| Initial Tension - 0.31 lb [1.38 N] | |
| Spring rate - 2.9 lb/in [.508 N/mm] |
| Large Extension springs | 
|
| OD: 0.3" | |
| Wire Diam: 0.049" | |
| Free length: 2.75" | |
| Load at length (4"): 15.6 lb [69.39 N] | |
| Initial Tension: 1.4 lb [6.23 N] | |
| Spring rate,k : 11.4 lb/in [1.996 N/mm] |
Be careful not to pull too far as you will plastically deform the metal and the spring will not collapse back to its original height.
Do not modify in any way. Any modification is not recommended and may destroy the spring.