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BOSCH REXROTH
R074122030


$453.95 USD
  • BOSCH REXROTH
  • Material:R074122030
  • Model:FLANGE LIN.BUSHING KBMFT-20-DD-NR

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 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
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
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 bushingsFT – Flanged, tandem
Footnote minimum static load capacity C0min
Static longitudinal moment load capacity ML026
Size L80
Size D243
Footnote maximum static load capacity C0max
Size B42
Weight0.24
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-R074122030-Flange LB, flange, tandem, 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-R074122030-Flange LB, flange, tandem, 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

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-R074122030-Flange LB, flange, tandem, 20, with two seals

Lubrication

Directives and standards

Notes