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BOSCH REXROTH
R074252000


$300.54 USD
  • BOSCH REXROTH
  • Material:R074252000
  • Model:FLANGE LIN.BUSHING KBMM-20-DD

Quantity in stock: 0

Note: Sales tax, and shipping will be calculated at checkout.
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth FLANGE LIN.BUSHING KBMM-20-DD (R074252000) is a robust and high-quality flange linear bushing designed for demanding applications requiring a central flanged configuration. This standard metal bushing features a hardened and ground outer sleeve, providing durability and precision. Its POM ball retainer ensures smooth ball movement, while the balls themselves are crafted from rolling bearing steel for reliable operation. With a shaft diameter of 20mm, this linear bushing is equipped with two integrated wiper seals to protect against contaminants, making it suitable for harsh environments such as woodworking shops, foundries, and cement plants. The wiper seals not only keep out dirt but also help maintain lubrication by containing multiple pockets that act as reservoirs. This design extends lubrication intervals or potentially allows for lubrication-free operation. The KBMM-20-DD can handle dynamic loads efficiently due to its rugged all-metal design with steel ball retainer that can withstand heavy contamination without jamming. The product's maximum dynamic load capacity and static load capacities are calculated based on a total travel of 100 km; however, these values can be adjusted if the travel is reduced to 50 km by multiplying by a factor provided in the specifications. This linear bushing operates effectively within a permissible ambient temperature range. It's important to note that unsealed linear bushings like this one may be used at higher temperatures with appropriate considerations for load capacity reduction. Overall, the Bosch Rexroth FLANGE LIN.BUSHING KBMM-20-DD offers reliability and performance for linear motion applications where environmental conditions are challenging and precision is critical. Its construction ensures long service life with minimal maintenance requirements, making it an excellent choice for various industrial applications.


Flange LB, central flanged, 20, with two seals

Flange linear bushing
Standard (metal)
Central flanged
Shaft diameter d = 20
With two seals
Version: Standard

Unpacked Weight: 0.237 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
Pockets collect any dirt that may have worked its way in to prevent the linear bushing from jamming.
Integrated wiper seals
Hardened and ground outer sleeve
POM ball retainer
Balls made of rolling bearing steel
Size V5.1
Size L with tolerance80 mm ±0,3
Rows of balls5
Footnote shaft radial clearance h6Determined from working bore diameter and shaft tolerance statistics. Recommended housing bore tolerance: H6 or H7
SeriesStandard (metal)
Footnote friction force FRFrictional 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 Cmax1300
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 amax100
Permissible ambient temperature-10 °C ... +80 °C
Outer diameter D32
Breakaway force12
Maximum permissible linear speed vmax2.5
Size D32
Size D154
Size L236
Friction force4
Footnote minimum dynamic load capacity CminThe 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 CmaxThe 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 ID17
Permissible ambient temperature (max)+80
Permissible ambient temperature (min)-10
Size S5.5
Minimum static load capacity C0min1720
Size L18
Maximum static load capacity C0max2500
Minimum dynamic load capacity Cmin1100
Shaft diameter d20
Linear guide typeLinear bushing and shaft
Filter for linear bushings and shaftsLinear bushings
Format of linear bushingsM – Central flanged
Footnote minimum static load capacity C0min
Static longitudinal moment load capacity ML026
Size L80
Size D243
Footnote maximum static load capacity C0max
Size B42
Weight0.237
Size D1 with tolerance54 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.

 

technical illustration-R074252000-Flange LB, central flanged, 20, with two seals

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).

technical illustration-R074252000-Flange LB, central flanged, 20, with two seals

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

Life expectancy calculation

General mounting instructions

Customer-built housings

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.

technical illustration-R074252000-Flange LB, central flanged, 20, with two seals

Lubrication

Directives and standards

Notes