BOSCH REXROTH
R074122030
$453.95 USD
- BOSCH REXROTH
- Material:R074122030
- Model:FLANGE LIN.BUSHING KBMFT-20-DD-NR
Quantity in stock: 0
The Bosch Rexroth FLANGE LIN.BUSHING KBMFT-20-DD-NR (R074122030) is a high-quality flange linear bushing designed for demanding applications that require robust motion control. This tandem flange linear bushing features a rust-resistant and rugged all-metal design, with a steel ball retainer that is suitable for harsh environments and heavy contamination. The product has been engineered to withstand use in challenging conditions such as woodworking, foundries, and cement plants, and its stainless steel construction also makes it ideal for medical, chemistry, and food industry applications. The KBMFT-20-DD-NR is equipped with two integrated wiper seals to protect against dirt ingress, ensuring smooth operation without jamming. It has multiple lubricant reservoirs that contribute to extended lubrication intervals or even lubrication for life. The outer sleeve of the bushing is hardened and machined from stainless steel, providing exceptional durability. The ball retainer and balls are also made of high-grade stainless steel, while the flange and retaining rings secure the ball retainer in place. With a shaft diameter (d) specification and size V designation, this linear bushing accommodates significant dynamic load capacities based on a total travel distance of 100 km (with adjusted values for 50 km). Its design includes multiple rows of balls to distribute the load evenly. The permissible ambient temperature range for operation extends from -30°C up to 80°C, but it should be noted that unsealed versions can be used at higher temperatures with reduced load capacity. The KBMFT-20-DD-NR's performance characteristics include a maximum dynamic load capacity (Cmax), minimum dynamic load capacity (Cmin), static load capacities (both minimum Cmin and maximum Cmax), as well as static longitudinal moment load capacity (ML). Its size L specifies its dimensions while the weight is noted at 0.3 kg. This linear bushing's format FT signifies its flanged tandem configuration which provides added stability in linear motion applications.
Flange LB, flange, tandem, 20, with two seals
Flange linear bushing
Standard (metal)
Flanged, tandem
Shaft diameter d = 20
With two seals
Version: Rust-resistant
Unpacked Weight: 0.24 kg
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 |
Stainless steel for the medical, chemistry and food industries |
Integrated wiper seals |
Pockets collect any dirt that may have worked its way in to prevent the linear bushing from jamming. |
Hardened and machined outer sleeve made of stainless steel comparable to 1.4125 |
Ball retainer made of stainless steel comparable to 1.4301, made of POM for shaft diameter 5 |
Balls made of stainless steel comparable to 1.4125 |
Flange and retaining rings for ball retainer made of stainless steel comparable to 1.4006 |
Data Sheet | Download Data Sheet |
3D CAD | Download 3D CAD |
3D CAD | Download 3D CAD |
Manual | Download Manual |
Manual | Download Manual |
Manual | Download Manual |
Manual | Download Manual |
Manual | Download Manual |
Size V | 5.1 |
Size L with tolerance | 80 mm ±0,3 |
Rows of balls | 5 |
Footnote shaft radial clearance h6 | Determined from working bore diameter and shaft tolerance statistics. Recommended housing bore tolerance: H6 or H7. |
Series | Standard (metal) |
Footnote friction force FR | 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. |
Maximum dynamic load capacity Cmax | 1300 |
Footnote permissible ambient temperature (min ... max) | Only unsealed linear bushings with steel ball retainers may be used at higher temperatures. Make allowance for reductions in load capacity. |
Max. acceleration amax | 100 |
Permissible ambient temperature | -10 °C ... +80 °C |
Outer diameter D | 32 |
Breakaway force | 12 |
Maximum permissible linear speed vmax | 2.5 |
Size D | 32 |
Size D1 | 54 |
Friction force | 4 |
Footnote minimum dynamic load capacity Cmin | The dynamic load capacities are based on a total travel of 100,000 m. When based on 50,000 m, the C values in the table are to be multiplied by 1.26. |
Footnote maximum dynamic load capacity Cmax | The dynamic load capacities are based on a total travel of 100,000 m. When based on 50,000 m, the C values in the table are to be multiplied by 1.26. |
Productgroup ID | 17 |
Permissible ambient temperature (max) | |
Permissible ambient temperature (min) | |
Size S | 5.5 |
Minimum static load capacity C0min | 1720 |
Size L1 | 8 |
Maximum static load capacity C0max | 2500 |
Minimum dynamic load capacity Cmin | 1100 |
Shaft diameter d | 20 |
Linear guide type | Linear bushing and shaft |
Filter for linear bushings and shafts | Linear bushings |
Format of linear bushings | FT – Flanged, tandem |
Footnote minimum static load capacity C0min | |
Static longitudinal moment load capacity ML0 | 26 |
Size L | 80 |
Size D2 | 43 |
Footnote maximum static load capacity C0max | |
Size B | 42 |
Weight | 0.24 |
Size D1 with tolerance | 54 mm |
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
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 | |||
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 |
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.
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