BOSCH REXROTH
R067215040

$287.75 USD

BOSCH REXROTH
Material:R067215040
Model:KBB-50-D

Quantity in stock: 0

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***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 SUPER LINEAR BUSH KBB-50-D (R067215040) is a high-performance linear bushing designed for smooth, precise linear movement in various applications. This model is part of the Super LB B series, which is characterized by its closed design and lack of self-alignment feature, making it ideal for transferring lower tipping forces along the axial direction. It has a shaft diameter of 'd' and comes with one seal to protect against contaminants. Constructed with steel bearing plates that have machined ball guide grooves and optimized ball lead-in chamfers, the KBB-50-D ensures outstandingly smooth travel and a long service life. The bushing achieves high travel speeds up to 'vmax' meters per second, although it should be noted that service life may be limited due to increased wear on plastic parts at such speeds. Tests have indicated total travel ranging from 10^4 m to 10^5 m without failure. The KBB-50-D features a ball retainer and an outer sleeve made from either PA or POM materials, while the balls themselves are crafted from rolling bearing steel. This model does not require initial lubrication, which simplifies installation and maintenance. The dynamic load capacities are significant; with minimum dynamic load capacity 'Cmin' and maximum dynamic load capacity 'Cmax', these values are based on a total travel distance of 100 km. Additionally, the product can operate within a wide range of ambient temperatures from minimum 'Tmin' degrees Celsius to maximum 'Tmax' degrees Celsius. The friction coefficient varies between minimum 'fmin' to maximum 'fmax', indicating efficiency under different load conditions. This linear bushing weighs in at . kg and has radial clearance specifications for different fits (shaft bore K, H, M). Overall, the Bosch Rexroth SUPER LINEAR BUSH KBB-50-D offers reliable performance for applications requiring precise linear motion without self-alignment capabilities.

Super LB B, closed, 50, with one seal

Super linear bushing
Super B (no self-alignment feature)
Closed
Shaft diameter d = 50
With one seal

Unpacked Weight: 0.614 kg

Low-cost linear bushing for high requirements
Steel bearing plates with machined ball guide grooves and optimized ball lead-in chamfers for outstandingly smooth travel and a long service life
Without self-alignment feature for transferring lower tipping force along the axial direction
High travel speed (5 m/s)
Integrated wiper seals, external seals or no wiper seals
Ball retainer and outer sleeve made of PA or POM
Balls made of rolling bearing steel
No initial lubrication

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Rows of balls	6
Series	Super B (no self-alignment feature)
Footnote friction force FR	1. One wiper seal: Multiply value with factor 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.
Size C1 H13	77.3
Maximum dynamic load capacity Cmax	14730
Max. acceleration amax	150
Footnote friction coefficient μ	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.
Permissible ambient temperature	-10 °C ... +80 °C
Outer diameter D	75
Breakaway force	10
Maximum permissible linear speed vmax	3
Size D	75
Size D1	71.5
Friction coefficient μ	0,001 ... 0,0025
Size C h13	100
Size C2	2.65
Friction coefficient μ max.	0.0025
Note: Maximum permissible speed vmax	Speeds of up to 5 m/s possible. Service life is limited by heightened wear to plastic parts. Tests have shown total travel from 50 • 10⁵ m to 100 • 10⁵ m without failure.
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.
Friction coefficient μ min.	0.001
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)	+80
Permissible ambient temperature (min)	-10
Friction force FR footnote 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.
Footnote breakaway force	One wiper seal: Multiply value with factor 0.5
Minimum static load capacity C0min	6470
Maximum static load capacity C0max	8280
Minimum dynamic load capacity Cmin	12060
Shaft diameter d	50
Linear guide type	Linear bushing and shaft
Filter for linear bushings and shafts	Linear bushings
Format of linear bushings	– Closed
Footnote minimum static load capacity C0min
Footnote maximum static load capacity C0max
Weight	0.614
Size D1 with tolerance	71.5 mm
Radial clearance shaft h6/bore K7	+29,-9
Radial clearance shaft/bore h6/H7	+50,+12
Radial clearance shaft h6/bore M7	+20,-18

General technical data

Ø d	mm	10	12	16	20	25	30	40	50
amax	m/s²	150
vmax 1)	m/s	3
m	kg	0.017	0.023	0.028	0.061	0.122	0.185	0.36	0.58
FR 2)	N	0.5	0.8	1	1.5	2	2.5	3	4
Breakaway force 3)	N	1	1.5	2	3	4.5	6	8	10
μ 4)		0.001 ... 0.0025
Rows of balls		5			6
Shaft radial clearance h6/bore H7	µm	+ 9 + 36	+ 38 + 10		+ 43 + 11			+ 50 + 12
Shaft radial clearance h6/bore K7	µm	+ 21 - 6	+ 23 - 5		+ 25 - 7			+ 29 - 9
Shaft radial clearance h6/bore M7	µm	+ 15 - 12	+ 17 - 11		+ 18 - 14			+ 20 - 18
Operating conditions
Permissible ambient temperature (min ... max)		-10 °C ... +80 °C

1)	Speeds of up to 5 m/s possible. Service life is limited by heightened wear to plastic parts. Tests have shown total travel from 50 • 105 m to 100 • 105 m without failure.
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)	One wiper seal: Multiply by a factor of 0.5.
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	10	12	16	20	25	30	40	50
Cmin	N	600	830	1020	2020	3950	4800	8240	12060
Cmax	N	820	1140	1400	2470	4820	5860	10070	14730
C0min	N	330	420	530	1050	2180	2790	4350	6470
C0max	N	480	620	780	1340	2790	3570	5570	8280

	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
m	Mass	kg
vmax	Maximum permissible speed	m/s
μ	Friction coefficient

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-R067215040-Super LB B, closed, 50, with one seal

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

Definition of dynamic load ratings

Sealing

Super linear bushings come both with integrated and separate wiper seals. The separate wiper seals are specially designed for applications in high contamination environments. An additional seal (for example, bellows, extendable cover) is necessary for extremely high contamination environments. The open super linear bushings can also come fully sealed (with longitudinal seal), however this increases friction.

Dimensions

Ød		mm	10	12	16	20	25	30	40	50
D		mm	19	22	26	32	40	47	62	75
C	h13	mm	29	32	36	45	58	68	80	100
C1	H13	mm	21.6	22.6	24.6	31.2	43.7	51.7	60.3	77.3
C2		mm	1.3			1.6	1.85		2.15	2.65
D1		mm	18	21	24.9	30.5	38.5	44.5	58.5	71.5

Life expectancy calculation

Radial clearance

The radial clearance values shown in the table have been determined from statistics and correspond to values expected in practice.

Adjusting radial clearance

The radial clearance of all Linear Bushings can be adjusted. If, for instance, a zero-clearance guideway is needed, the radial clearance of the Linear Bushing must be reduced using the adjusting screw on the housing (see also Linear Sets) until slight resistance occurs when rotating the shaft. Secure the adjusting screw for applications where vibrations are present.

Adjusting preload

For preloading, the aforementioned adjustment is made using an adjustment shaft that is weaker by the degree of preload.

Customer-built housings

General mounting instructions

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.