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Types, materials and heat-resistant temperature.
| Type | Model | Identification colors, anti-rust treatment | Material | Temperature range for use |
| Lightest load | T F | Yellow, Electrophoretic coating | Oil tempered wire for mechanical spring | – 30°C ~ 150°C |
| Light load | T L | Blue, Electrophoretic coating | Oil tempered wire for mechanical spring | – 30°C ~ 150°C |
| Medium load | T M | Red, Electrophoretic coating | Oil tempered wire for mechanical spring | – 30°C ~ 150°C |
| Heavy load | T H | Green, Electrophoretic coating | Oil tempered wire for mechanical spring | – 30°C ~ 150°C |
| Extra heavy load | T B | Brown, Electrophoretic coating | Oil tempered wire for mechanical spring | – 30°C ~ 150°C |
Dimensions related to usage and compression ratios
| Type | Free length x % 1,000,000 cycles Deflection | Free length x % 500,000 cycles Deflection | Free length x % 300,000 cycles Deflection | Solid deflection (Free length x %) |
| T F Lightest load | 40.0% | 45.0% | 50.0% | Reference value 53.0% |
| T L Light load | 32.0% | 36.0% | 40.0% | Reference value 43.0% |
| T M Medium load | 25.6% | 28.8% | 32.0% | Reference value 35.0% |
| T H Heavy load | 19.2% | 21.6% | 24.0% | Reference value 26.0% |
| T B Extra heavy load | 16.0% | 18.0% | 20.0% | Reference value 22.0% |
