Mô tả
Dimensions
| Ø d1 | 20,0 mm |
| Outer diameter d2 | 23,0 mm |
| Bearing length b1 | 20,00 mm |
| Length of bevel f1 | 0,8 mm |
| Bevel angle [°] | 30,00 ° |
| Length of bevel f4 | 0,5 mm |
| Bevel angle f4 [°] | 30,00 ° |
Production and installation tolerances
|
Testing methods
|
+0.040 +0.124 mm, E10 |
| b1-Tolerance | ±0.25 mm |
| Housing bore tolerance | 0 +0.021 mm, H7 |
| Tolerance shaft | 0 -0.043 mm. h9 |
| d1 after press-fit (max.) | 20,124 mm |
| d1 after press-fit (min.) | 20,040 mm |
| Housing bore (max.) | 20,021 mm |
| Housing bore (min.) | 20,000 mm |
| Shaft size (max.) | 20,000 mm |
| Shaft size (min.) | 19,957 mm |
General properties
| Density | 1.27 g/cm3 |
| Color | black |
| Max. moisture absorption (at 23 °C/73 °F, 50% r.h.) | 3.0 Wt.-%, test method DIN 53495 |
| Max. water absorption | 9.3 Wt.-% |
| Coefficient of sliding friction, dynamic, against steel | 0.14 – 0.26 μ |
| pv value, max. (dry) | 0.70 MPa ⋅ m/s |
Mechanical properties
| Modulus of elasticity | 3,074 MPa, test method DIN 53457 |
| Flexural strength (at 20 °C/68 °F) | 97 MPa, test method DIN 53452 |
| Pressure load | 68 MPa |
| Shore-D Hardness | 80, test method DIN 53505 |
| Max. recommended surface pressure (at +20 °C/68 °F) | 55,0 MPa |
Physical and thermal properties
| Max. long-term application temperature | 140 °C |
| Max. short-term application temperature | 180 °C |
| Lower application temperature | -40 °C |
| Heat conductivity | 0.24 W/(m ⋅ K), test method ASTM C 177 |
| Thermal expansion coefficient (at 23°C/73°F) | 3 K-1 ⋅ 10-5, test method DIN 53752 |
Electrical properties
| Specific volume resistance | > 1012 Ωcm, test method DIN IEC 93 |
| Surface resistance | > 1012 Ω, test method DIN 53482 |
