Nylon Worm Gear : 1. Melting point: 223 225°c 2. Density: 1.15 1.17g/cm3 3. Heat Deformation temperature: 150 190°c 4. Rockwell hardness: M91 5. Frection coefficient: 0.46 0.52 6. Long-time use temperature: 120 140°c 7. Coefficient of thermal expansion: 4-7×10³ 8. Impact strength: 400×600Kg/CM² 9. Expansion strength: 75-100KGF/CM³ 10. Compression strength: 100-140MPa 11. Shear strength: 74-81MPa 12. Flexural stength: 140-170MPa 13. Working temperature: -50°c +140°c 14. Martin heat (use in oil)120-140°c