Technical Symbols and Units
The technical symbols, descriptions, and units used in this catalogue are shown in the table below. These symbols are used in calculations, specifications, and technical drawings.
| Symbol | Description | Unit |
|---|---|---|
| a | Event probability | Factor |
| C0 | Static load capacity | N |
| C | Dynamic load capacity for 100,000 m travel distance For SCHNEEBERGER products, C corresponds to C100 | N |
| C100 | Dynamic load capacity for 100,000 m travel distance | N |
| C50 | Dynamic load capacity for 50,000 m travel distance | N |
| Ceff | Effective load capacity per rolling element | N |
| Dw | Diameter of rolling element | mm |
| F | Operating load, load on linear guideway | N |
| F1... F2... | Individual loads | N |
| fh | Hardness factor | Factor |
| ft | Temperature factor | Factor |
| H | Stroke | mm |
| K | Cage length | mm |
| Kt | Load-bearing (cage) length | mm |
| L | Length | mm |
| L | Rated service life | m |
| L1 ... L2 ... | Partial travel distances | mm |
| M | Moment load (longitudinal and transverse) | Nm |
| Mds | Tightening torque | Ncm |
| ML | Permissible moment load (longitudinal and transverse) | Nm |
| MQ | Permissible moment load (transverse) | Nm |
| P | Dynamic equivalent load | N |
| PL | Dynamic equivalent load (longitudinal) | N |
| PQ | Dynamic equivalent load (transverse) | N |
| Pvs | Infeed force | N |
| Q | Mean linear guideway spacing | mm |
| RA | Number of rolling elements | pcs |
| RT | Number of load-bearing rolling elements | pcs |
| RTmin | Correction factor | Factor |
| t | Cage pitch | mm |
| t2 | Intermediate segment length | mm |
| w | Distance from cage start to centre of first rolling element | mm |
| δS | Deformation of connecting structure | µm |
| δA | Deformation of rolling elements including guideway | µm |
Common Unit Abbreviations
Unit Descriptions
- N - Newton (unit of force)
- Nm - Newton metre (unit of torque)
- Ncm - Newton centimetre (unit of torque)
- mm - Millimetre (unit of length)
- m - Metre (unit of length)
- µm - Micrometre (unit of length, 1 µm = 0.001 mm)
Important Notes
Note: When performing calculations, ensure that a consistent unit system is used. All values in this catalogue are based on the International System of Units (SI).
Dual meaning of symbol L: The symbol L has different meanings in different contexts. Please determine from context whether it refers to "length" (unit: mm) or "rated service life" (unit: m).
Factor Descriptions
"Factor" in the table indicates that the parameter is a dimensionless value used for correction or adjustment in calculations. Common factors include:
- Hardness factor (fh) - Considers the effect of material hardness on performance
- Temperature factor (ft) - Considers the effect of operating temperature on performance
- Correction factor (RTmin) - Used for load calculation corrections
- Event probability (a) - Probability factor in statistical analysis