| Material | ρ―Density [kg/m3] | α―Coef. of thermal expansion [1/K] | k―Thermal conductivity [W/mK] |
| NBR rubber | 1190 | 1.1 × 10−3 | 0.14 |
| Shaft | 7850 | 1.2 × 10−5 | 60.5 |
| Spring | 7850 | 1.2 × 10−5 | 60.5 |