BOSCH REXROTH
R166231420

$203.97

BOSCH REXROTH
Material:R166231420
Model:KWD-035-SKS-C1-N-1

Quantity in stock: 0

Ball runner block (self-aligning), SKS, size 35, steel CS, accuracy standard, low preload, without ball chain

The self-adjusting ball runner block compensates for alignment errors of up to 10’. Additionally, it is characterized by the following product features:
Size 35
Format SKS: Width = slimline, length = short, height = standard
Runner block body made of carbon steel CS
Preload class C1: Low preload
Accuracy class N: Standard
Without ball chain
With initial lubrication and preservation
Roller bearing grease Dynalub 510
Without attachment element, left (front reference edge)
Without attachment element, right (front reference edge)
Straight lube connection loosely attached.
Runner block body in standard version
Overall length of the runner block = 84.9 mm
Interchangeability: The runner block and the guide rails can be combined with each other with every accuracy.

Unpacked Weight: 0.900 kg

Product description of Ball Rail Systems

Production description – Ball Runner Block

Materials

Selection of a linear guide acc. to DIN 637

Ball chain and seals

Design and version

Friction

technical illustration-R166231420-Ball runner block (self-aligning), SKS, size 35, steel CS, accuracy standard, low preload, without ball chain

Due to the Rexroth design with four rows of balls, 2-point contact is available in all loading directions. This reduces the friction to a minimum.

Other ball rail systems with two or four rows of balls with 4-point contact have multiple friction: due to the differential slip with lateral loading and in case of comparable prestressing without the load, the gothic raceway profile causes higher friction (depending on the raceway curvature and the load, up to five times the friction coefficient). This high friction leads correspondingly to greater heat.

Seals

Seals are use to prevent dirt, chips and coolants, etc. from working their way into the inside of he Ball Runner Block, thereby preventing reductions to its service life. For further information, see "Selection criteria/seals".

Standard seal (SS)

Universal seals are fitted as standard in Rexroth Ball Runner Blocks. They have a uniform sealing effect for Ball Guide Rails with and without cover strips. Low friction and a good sealing effect have both been taken into account in the design. For applications where effective sealing is required.

Low-friction seal (LS)

For special requirements with regard to ease of movement.

Double-lip seal (DS)

For increased exposure to media

Front seal

For applications in environments with fine dirt or metal particles, as well as coolants or cutting fluids.

Interchangeable during servicing.

Front seals are available as accessories for mounting by the customer.

FKM seal

For applications in extreme environments with fine dirt or metal particles, as well as heavy use of coolants or cutting fluids.

Interchangeable during servicing.

FKM front seals are available as accessories for mounting by the customer.

Cover plate wiper

For use in environments with coarse dirt or chips.

Cover plate wiper are available as accessories for mounting by the customer.

Internal ball loads at angle alignment errors α

a) Internal ball load, Rexroth Ball Rail System with Self-aligning

b) Internal ball load, Ball Rail System without Self-aligning

Self-aligning

Rexroth Super Ball Runner Blocks with self-aligning feature automatically compensate misalignments up to 10 ft.

No reduction in load capacity occurs as a result of angular pressure.

The central contact pad zone of the steel inserts is used as a rotation point for a rocker effect.

Misalignments between Ball Runner Blocks and Ball Guide Rails are therefore not problematic since machining inaccuracies, mounting errors or rail deflections are automatically compensated.

The self-aligning feature ensures that the balls enter the load-bearing zone smoothly and that the load is distributed evenly across the entire row of balls.

This results in

extra-smooth running and considerably longer service life.

Using two Super Ball Runner Blocks on one Ball Guide Rail, a system of high-load bearing and stabilized Ball Rail Systems can be created that is particularly suitable for the handling sector.

Area of application: For compensating large tolerances in the adjoining structure
Low noise level and outstanding travel behavior
Excellent dynamic characteristics: Excellent dynamic characteristics
Limitless interchangeability as all ball guide rail systems can be combined at will with all ball runner block versions within each accuracy class.
Extra-compact design
Compensates own misalignments (for deviations up to 10' in 2 levels)
The same high load ratings in all four main directions of loading
Lube fittings with metal threads on all sides
Smooth operation due to optimal return and ball pick-up and entry design
Preload classes: C0 (without preload, clearance) and C1 (moderate preload)
Enables greater parallelism and height offsets of mounting bases
Can be used on all SNS ball guide rails

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Material (profiled rail systems)	Carbon steel
Maximum permissible torsional moment Mt max	175
Size N6 with tolerance (profiled rail systems)	20,5 mm ±0,5
Height of runner block	40.4
Footnote permissible ambient temperature (min ... max)	100 °C admissible for short time. For operation at negative temperatures, please consult us.
Footnote dynamic load capacity C	Determination of the dynamic load capacities and load moments is based on a 100 000 m travel as per DIN ISO 14728-1. Often only 50 000 m are actually stipulated. For comparison: Multiply values C, Mt and ML from the table by 1.26.
Size S5 (profiled rail system)	9
Max. acceleration amax	500
Footnote friction coefficient μ	Without friction of seal
Permissible ambient temperature	-10 °C ... +80 °C
Maximum dynamic load Fmax	8100
Size A (profiled rail systems)	70
Size N6 tolerance (profiled rail systems)	±0.5
Size A3 (profiled rail systems)	18
Preload force	420
Format	SKS - slimline, short, standard height
Size A2 (profiled rail systems)	34
Self-aligning for compensation of misalignments	With self-alignment
Maximum permissible linear speed vmax	5
Lubrication	With initial lubrication and preservation
Ball chain	Without ball chain (standard)
Friction coefficient μ	0,002 ... 0,003
Size B tolerance (profiled rail systems)	+0.5
Size N3 (profiled rail systems)	13
Pitch T guide rail	80
Height of runner block with guide rail	48
Dynamic torsional moment load capacity Mt	450
Size N6 (profiled rail systems)	20.5
Friction coefficient μ max.	0.003
Size H2 with cover strip (profiled rail systems)	31.85
Size B (profiled rail systems)	84.9
Preload class	C1 - Low preload
Size H2 with cover strip (profiled rail systems)	32.15
Seal	SS – Standard seal
Size B1 (profiled rail systems)	51.4
Size H (profiled rail system)	48
Friction coefficient μ min.	0.002
Size K2 (profiled rail systems)	34.2
Size V1	8
Productgroup ID	17
Accuracy class	N - normal
Size K4 (profiled rail systems)	6.9
Size B with tolerance (profiled rail systems)	84,9 mm +0,5
Size K1 (profiled rail systems)	32.7
Size K3 (profiled rail systems)	6.9
Size A1 (profiled rail systems)	35
Dynamic longitudinal moment load capacity ML footnote	Determination of the dynamic load capacities and load moments is based on a 100 000 m travel as per DIN ISO 14728-1. Often only 50 000 m are actually stipulated. For comparison: Multiply values C, Mt and ML from the table by 1.26.
Permissible ambient temperature (max)	+80
Size S9 thread diameter x lead with tolerance (profiled rail systems)	M3x5
Size S2 (profiled rail systems)	M8
Permissible ambient temperature (min)	-10
Note: Max. acceleration amax	If F_comb◡> 2.8 • F_pr : a_max = 50 m/s²
Runner block or guide rail	Runner block
Width of runner block	70
Size T1 min (profiled rail systems)	16
Dynamic torsional moment load capacity Mt footnote	Determination of the dynamic load capacities and load moments is based on a 100 000 m travel as per DIN ISO 14728-1. Often only 50 000 m are actually stipulated. For comparison: Multiply values C, Mt and ML from the table by 1.26.
Size E8 (profiled rail systems)	58
Length of runner block	84.9
Size S9 thread diameter x lead with (profiled rail systems)	M3x5
Linear guide type	Ball rail system
Dynamic load capacity C	21100
Size E9 (profiled rail systems)	17.35
Size E1 (profiled rail systems)	50
Internal product information	For LS – low-friction seal with external longitudinal seal
Weight	0.900
Nominal size	35
Size H1 (profiled rail systems)	40.4

Load capacities and load moments

Size		15	20	25	30	35
C	N	3900	10100	11400	15800	21100
Fmax	N	1500	3900	4400	6100	8100
Mt	Nm	39	130	170	270	450
Mt max	Nm	15	50	65	105	175

	The calculation of the dynamic load ratings and load moments is based on a stroke length of 100,000 m as per DIN ISO 14728-1. However, often only 50,000 m is actually stipulated. For comparison: Multiply the values C,Mt and ML from the table by 1.26.

General technical data

Size		15	20	25	30	35
amax 1)	m/s²	500
vmax	m/s	5
m	kg	0.1	0.25	0.35	0.6	0.9
μ 2)		0.002 ... 0.003
Operating conditions
Size		15	20	25	30	35
Permissible ambient temperature (min ... max) 3)		-10 °C ... +80 °C

1)	If Fcomb > 2.8 • Fpr : amax = 50 m/s2
2)	Without friction of seal
3)	Up to 100 °C permissible for short periods. For operation at negative temperatures, please consult us.

Legend

Symbol	Description	Unit
amax	Maximum acceleration travel	m/s2
C	Dynamic load capacity	N
C0	Static load capacity	N
m	Mass	kg
ML	Dynamic longitudinal moment load capacity	Nm
ML0	Static longitudinal moment load capacity	Nm
Mt	Dynamic torsional moment load capacity	Nm
Mt0	Static torsional moment laod capacity	Nm
vmax	Maximum permissible speed	m/s
μ	Friction coefficient

General Notes

The general technical data and calculations apply to all Ball Rail Systems i.e. to all Ball Runner Blocks and Ball Guide Rails. Specific technical data relating to the individual Ball Runner Blocks and Ball Guide Rails is listed separately.

Preload classes

To cover the widest possible range of applications, Rexroth Ball Runner Blocks are available in different preload classes.

The following preload classes are available:

Ball Runner Block without preload (preload class C0) Ball Runner Blocks with moderate preload (preload class C1) Ball Runner Blocks with average preload (preload class C2) Ball Runner Blocks with high preload (preload class C3)

To prevent reductions to the service life, the preload should not exceed 1/3 of the load on bearing F.

In general, the rigidity of the Ball Runner Block rises with increasing preload. If vibrations occur, select a correspondingly high preload (≥ preload class C2).

Guide systems with parallel rails

When choosing the preload class, pay attention to permissible parallelism offset of rails too ("Accuracy class selection criterion").

When specifying ball rail systems of accuracy class N, we recommend preload class C0 or C1 to avoid distortive stress due to the tolerances.

Accuracy classes

System preload

a)	For O-ring
	Size 15: Ø 4 · 1.0 (mm)
	Size 20 - 35: Ø 5 · 1.0 (mm)
	Open lube port if necessary (see general technical notes and information in the "Maintenance" section).
b)	Lube nipple, size 15 - 20:
	Funnel-type lube nipple DIN 3405–A M3x5, B2 = 1.6 mm
	When using different lube nipples, pay attention to the screw-in depth of 5 mm!
	Lube nipple, size 25 - 35:
	Hydraulic-type lube nipple DIN 71412–A M6x8, B2 = 9.5 mm
	When using different lube nipples, pay attention to the screw-in depth of 8 mm!
	The lube nipple is included in the scope of delivery (not installed).
	Connection is possible on all sides.

Dimensions

Size		15	20	25	30	35
A	mm	34	44	48	60	70
A1	mm	17	22	24	30	35
A2	mm	15	20	23	28	34
A3	mm	9.5	12	12.5	16	18
B		44.7 mm +0.5	57.3 mm +0.5	67 mm +0.5	75.3 mm +0.5	84.9 mm +0.5
B1	mm	25.7	31.9	38.6	45	51.4
E1	mm	26	32	35	40	50
E8	mm	24.55	32.5	38.3	48.4	58
E9	mm	6.7	7.3	11.5	14.6	17.35
H	mm	24	30	36	42	48
H1	mm	19.9	25.35	29.9	35.35	40.4
Dimension H2 with cover strip	mm	16.3	20.75	24.45	28.55	32.15
Dimension H2 without cover strip	mm	16.2	20.55	24.25	28.35	31.85
K1	mm	16.25	22.95	25.35	28.8	32.7
K2	mm	17.85	22.95	26.5	30.5	34.2
K3	mm	3.2	3.35	5.5	6.05	6.9
K4	mm	3.2	3.35	5.5	6.05	6.9
N3	mm	6	7.5	9	12	13
N6		10.3 mm ±0.5	13.2 mm ±0.5	15.2 mm ±0.5	17 mm ±0.5	20.5 mm ±0.5
S2		M4	M5	M6	M8
ØS5	mm	4.5	6	7	9
S9		M2.5x3.5	M3x5
T	mm	60			80
V1	mm	5	6	7.5	7	8