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Description
- High-precision Linear Bushing for moving heavy loads
- Hardened steel load-bearing plates with machined ball guide grooves and machined steel load-bearing plate back for maximum precision
- Super H with even more running tracks for maximum dynamic load rating and rigidity
- Compensates for shaft deflection and misalignment up to 30'
- High travel speed (5 m/s)
Features
- With longitudinal seal
- Optional integrated, double-lipped wiper seals
- POM ball retainer
- Balls made of rolling bearing steel
- Two metal holding rings
Technical data
General technical data
| Ø d | mm | 20 | 25 | 30 | 40 | 50 | |||||
| amax | m/s² | 150 | |||||||||
| vmax | m/s | 5 | |||||||||
| m | kg | 0.075 | 0.16 | 0.25 | 0.5 | 0.9 | |||||
| FR 1) 2) | N | 2.5 | 4 3) | 3 | 4.5 3) | 4 | 6 3) | 5 | 7.5 3) | 6 | 9 3) |
| Breakaway force 1) | N | 5 | 7.5 3) | 7 | 10.5 3) | 9 | 13.5 3) | 12 | 18 3) | 15 | 22.5 3) |
| μ 4) | 0,001 ... 0,004 | ||||||||||
| Rows of balls | 8 | 10 | |||||||||
| Shaft radial clearance h6/bore H7 | µm | + 43 + 11 | + 50 + 12 | ||||||||
| Shaft radial clearance h6/bore K7 | µm | + 25 - 7 | + 29 - 7 | ||||||||
| Shaft radial clearance h6/bore M7 | µm | + 18 - 14 | + 20 - 18 | ||||||||
| Operating conditions | |||||||||||
| Permissible ambient temperature (min ... max) | -20 °C ... +80 °C | ||||||||||
| 1) | One wiper seal: Multiply by a factor of 0.5. |
| 2) | Frictional drags generated by Linear Bushings with integrated wiper seals on two sides when not under radial load. The frictional drags depend on speed and lubrication. |
| 3) | For fully sealed Linear Bushings |
| 4) | Friction coefficients of unsealed Linear Bushings when lubricated with oil. The friction coefficient is lowest under heavy load, but can still be above the specified value even under a low load. |
Load capacities and load moments
| Ød | mm | 20 | 25 | 30 | 40 | 50 |
| C 1) | N | 3530 | 6190 | 6300 | 13500 | 22300 |
| C0 1) | N | 2530 | 4530 | 7180 | 10400 | 16800 |
| 1) | The load ratings apply for the main direction of loading. |
| The load ratings are based on a total travel of 100, 00 m. When based on 50 000 m, the values in the table need to be multiplied by 1.26. |
Legend
| Symbol | Description | Unit |
| Ød | Shaft diameters | mm |
| amax | Maximum acceleration travel | m/s2 |
| C | Dynamic load capacity | N |
| C0 | Static load capacity | N |
| FR | Friction force | N |
| m | Mass | kg |
| vmax | Maximum permissible speed | m/s |
| μ | Friction coefficient |
See "Technical data – Load direction factors" and the diagrams/characteristic curves section for exact values for the 4 main directions of loading.
For load in the direction of opening, please refer to the loading diagrams (see "Diagrams" section).
Effect of load direction on load rating
| a) | Closed |
| b) | Open |
Main direction of loading
Load direction factors
The load ratings C and C0 apply for the load direction ρ = 0°. For all other load directions, the load ratings must be multiplied by the factors fr (dynamic load rating C) or fρ0 (static load rating C0).
Load direction factor Super SH
| Shaft | Load direction factor (dynamic load capacity) | |||||
| Ø d (mm) | ⇩ | ⇒⇐ | ⇑ | ⇩ | ⇒⇐ | ⇑ |
| 20 - 25 | 1 | 0,79 | 1 | 1 | 0,79 | 0,52 |
| 30 - 60 | 1 | 0,86 | 1 | 1 | 0,86 | 0,59 |
| Load direction factor (static load capacity) | ||||||
| 20 - 25 | 1 | 0,68 | 1 | 1 | 0,68 | 0,50 |
| 30 - 60 | 1 | 0,83 | 1 | 1 | 0,83 | 0,55 |
 |  | |||||
Reduced load capacity with short stroke
In case of short stroke, the service life of the shaft is less than that of the super Linear Bushing. The load ratings C specified in the tables must therefore be multiplied by the factor f.s .
| 1) | fs = factor |
| 2) | s = movement path |
Reduced load capacity with high load
The load rating is reduced under high load F. The dynamic load rating must be multiplied by the load factor f.F .
| 1) | fF = load factor |
Definition of dynamic load ratings
Installation dimensions/interchangeability
Super Linear Bushings H and SH have the same installation dimensions as Super Linear Bushings A and B as well as the standard Linear Bushings, but differ in terms of securing, radial clearance, load ratings and lubrication.
Sealing
Double protection through two-sided wiper seals:
- Outer sealing lip prevents dirt from entering
- Inner sealing lip prevents lubricant from escaping
The wiper seals float inside closed Linear Bushings. This makes them perfect for any operating state. The open Linear Bushings are fully sealed with additional side seals along the shaft. All seals can be replaced.
Diagrams/characteristic curves
Load direction factors
| a) | Closed |
| b) | Open |
Super Linear Bushings can be installed in any location. Choose a location that ensures that the main direction of loading is always ρ = 0°.
Dimensions
Dimensions
| Ød | mm | 20 | 25 | 30 | 40 | 50 | |
| D | mm | 32 | 40 | 47 | 62 | 75 | |
| α | ° | 60 | |||||
| C | h13 | mm | 45 | 58 | 68 | 80 | 100 |
| C1 | H13 | mm | 31.2 | 43.7 | 51.7 | 60.3 | 77.3 |
| C2 | mm | 1.6 | 1.85 | 2.15 | 2.65 | ||
| D1 | mm | 30.5 | 38.5 | 44.5 | 59 | 72 | |
| E 1) | mm | 9.5 | 12 | 12.8 | 16.8 | 22.1 | |
| K2 | mm | 1.3 | 2 | 7 | 9.5 | 10 | |
| K3 | mm | 14.7 | 18.5 | 21 | 27.5 | 33.5 | |
| S3 2) | 3 mm +0.1 | 3.5 mm +0.1 | 4.5 mm +0.1 | ||||
| 1) | Minimum size in relation to shaft Ø d |
| 2) | Holes at center of dimension C |
Legend
| Symbol | Description | Unit |
| Ød | Shaft diameters | mm |
| C/C0 | Main direction of loading |
Project planning information
Life expectancy calculation
Mounting
General mounting instructions
Customer-built housings
Commissioning
Initial lubrication
Linear bushings do not come with initial lubrication. Grease the Linear Bushings before use. Service life data is based on initial lubrication and relubricated Linear Bushings.
Maintenance
Lubrication
Accessories
Locating screws for super linear bushings H and SH
Locating screws for super linear bushings H and SH
- Various versions:closed or open-type, standard or corrosion-resistant, with or without retaining rings, wiper seals and longitudinal seals, flanged or flangeless, Linear Sets
- Temperature stability up to 200 °C
- Long service life, high running speed and extra rigidity
- Outstanding running properties: low friction, quiet running
- Compensation for misalignment or shaft deflections
Certification
Directives and standards
Safety Instructions
load errorDownloads
 | Linear Bushings and Shafts Manual | R320103669 | 2005-07-01 | English, French, German, Italian | PDF | 3.6MB Product Groups: Linear Bushings and Shafts |
| Linear Bushings Catalog | R999000488 | 2015-02-01 | English | PDF | 14.9MB Product Groups: Linear Bushings and Shafts |
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