Артикул: RX8413
Standard Linear Bushings, central flanged, normal, R0742 KBMM-..-DD
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Description
- Rugged all-metal design with steel ball retainer for harsh environments and heavy contamination
- Many pockets acting as lubricant reservoirs for extended lubrication intervals or lubrication for life
- For use in woodworking, foundries, cement plants
- Pockets collect any dirt that may have worked its way in to prevent the Linear Bushing from jamming.
- Integrated wiper seals
Features
- Hardened and machined outer sleeve
- POM ball retainer
- Balls made of rolling bearing steel
Technical data
General technical data
| Ø d | mm | 8 | 12 | 16 | 20 | 25 | 30 | 40 |
| amax | m/s² | 100 | ||||||
| vmax | m/s | 2.5 | ||||||
| m | kg | 0.05 | 0.09 | 0.14 | 0.23 | 0.5 | 0.72 | 1.6 |
| FR 1) | N | 0.5 | 2 | 3 | 4 | 5 | 6 | 8 |
| Breakaway force | N | 1 | 6 | 9 | 12 | 14 | 18 | 24 |
| Rows of balls | 4 | 5 | 6 | |||||
| Working bore diameter tolerance | µm | + 9 - 1 | + 11 - 1 | + 13 - 2 | + 16 - 4 | |||
| Shaft radial clearance h6 2) | µm | + 15 + 2 | + 17 + 2 | + 19 + 2 | + 20 + 3 | + 22 + 2 | + 27 + 1 | |
| Operating conditions | ||||||||
| Permissible ambient temperature (min ... max) 3) | -10 °C ... +80 °C | |||||||
| 1) | 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. |
| 2) | Determined from working bore diameter and shaft tolerance statistics. Recommended housing bore tolerance: H6 or H7. |
| 3) | Only unsealed Linear Bushings with steel ball retainers may be used at higher temperatures. Make allowance for reductions in load capacity. |
Load capacities and load moments
| Ød | mm | 8 | 12 | 16 | 20 | 25 | 30 | 40 |
| Cmin | N | 340 | 650 | 750 | 1100 | 1250 | 2000 | 2800 |
| Cmax | N | 390 | 750 | 860 | 1300 | 1350 | 2150 | 3000 |
| C0min | N | 470 | 840 | 880 | 1720 | 3240 | 4000 | 6600 |
| C0max | N | 660 | 1200 | 1260 | 2500 | 4200 | 5000 | 8400 |
| ML0 | Nm | 4.5 | 11 | 13 | 26 | 61 | 82 | 165 |
| 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 |
| Cmax | Maximum dynamic load rating | N |
| Cmin | Minimum dynamic load rating | N |
| C0max | Maximum static load rating | N |
| C0min | Minimum static load rating | N |
| FR | Friction force | N |
| ML0 | Static longitudinal moment load capacity | Nm |
| m | Mass | kg |
| vmax | Maximum permissible speed | m/s |
Impact of load direction on load rating of closed Linear Bushings
The listed load ratings should be chosen depending on installation in minimum or maximum position and should be based on the calculations. If the load direction is clearly defined and the Linear Bushings can be installed in maximum position, the load ratings Cmax. (dynamic load rating) and C0 max (static load rating) can be used. If aligned installation is not possible or the load direction is not defined, the minimum load ratings must be used.
Definition of dynamic load ratings
Installation dimensions/interchangeability
Standard Linear Bushings have the same installation dimensions as super Linear Bushings. They are interchangeable, differ however in terms of securing, radial clearance, load ratings and lubrication.
Sealing
Standard Linear Bushings come with a wiper seal with shaft diameters of 5 and higher. Open standard Linear Bushings with shaft diameters 20 to 80 can also come fully sealed (with longitudinal seal; increased friction).
Dimensions
Dimensions
| Ød | mm | 8 | 12 | 16 | 20 | 25 | 30 | 40 |
| B | mm | 25 | 32 | 35 | 42 | 50 | 60 | 75 |
| D | 16 mm -0.013 | 22 mm -0.016 | 26 mm -0.016 | 32 mm -0.019 | 40 mm -0.019 | 47 mm -0.019 | 62 mm -0.022 | |
| D1 | mm | 32 | 42 | 46 | 54 | 62 | 76 | 98 |
| D2 | mm | 24 | 32 | 36 | 43 | 51 | 62 | 80 |
| L | 46 mm ±0.3 | 61 mm ±0.3 | 68 mm ±0.3 | 80 mm ±0.3 | 112 mm ±0.3 | 123 mm ±0.3 | 151 mm ±0.3 | |
| L1 | mm | 5 | 6 | 8 | 10 | 13 | ||
| L1 | 5 mm | 6 mm | 8 mm | 10 mm | 13 mm | |||
| L2 | mm | 20.5 | 27.5 | 31 | 36 | 52 | 56.5 | 69 |
| S | mm | 3.5 | 4.5 | 5.5 | 6.6 | 9 | ||
| V | mm | 3.1 | 4.1 | 5.1 | 6.1 | 8.1 | ||
Legend
| Symbol | Description | Unit |
| Ød | Shaft diameters | mm |
| ML0 | Static torsional moment laod capacity | Nm |
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
Wiper seals for closed-type Super Linear Bushings and Standard Linear Bushings
Wiper seals for closed-type Super Linear Bushings and Standard Linear Bushings
- Galvanized metal case
- Elastomer wiper seal
Metal cases for Super Linear Bushings and standard Linear Bushings
Metal cases for Super Linear Bushings and standard Linear Bushings
- Galvanized steel
Locating screws for standard linear bushings
Locating screws for standard linear bushings
Certification
Directives and standards
Safety Instructions
Notes
Ordering codes
Material numbers
| Ød | Part number | Seals | Lubrication | Short product name | CAD data | Buy |
| mm | ||||||
| 8 | R074250800 | With two integrated wiper seals | No initial lubrication | KBMM-08-DD | ||
| 12 | R074251200 | KBMM-12-DD | ||||
| 16 | R074251600 | KBMM-16-DD | ||||
| 20 | R074252000 | KBMM-20-DD | ||||
| 25 | R074252500 | KBMM-25-DD | ||||
| 30 | R074253000 | KBMM-30-DD | ||||
| 40 | R074254000 | KBMM-40-DD |
Legend
| Symbol | Description | Unit |
| Ød | Shaft diameters | mm |
Explanation of short product name using sample Standard Linear Bushing KBM-FT-20-DD-NR
| Standard Linear Bushing | KBM-FT-20-DD-NR | |
| Type | Linear bushing | = KB |
| Series | Standard (metal) | = M |
| Design type | Closed | = |
| Open | = O | |
| Adjustable | = E | |
| Flanged type | = F | |
| Tandem | = T | |
| Central flanged | = M | |
| Shaft diameters | = 20 | |
| Seals | Fully sealed | = VD |
| With two seals | = DD | |
| With 1 seal | = D | |
| Without seal | = | |
| Version | Rust-resistant | = NR |
| Normal | = | |
Explanatory example of the short product name
| KB | M | M | 20 | DD |
| Linear bushing | Standard (metal) | Central flanged | Ø20 | With two seals |
Downloads
 | 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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