BOSCH REXROTH
R201221404

$420.77 USD

BOSCH REXROTH
Material:R201221404
Model:KWD-025-SLS-C1-N-0

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 B.RUNN. BLOCK NRII KWD-025-SLS-C1-N-0 (R201221404) is a high-precision ball runner block designed for linear motion applications where space is restricted in the transverse direction. This component is part of the Ball Rail Systems product group and is particularly suitable for use with SNS ball guide rails. It boasts a slimline width, long length, and standard height format (SLS), ensuring a compact design while providing maximum precision. Constructed from corrosion-resistant steel in accordance with DIN standards, this runner block body and all its steel components are engineered to withstand harsh environments, making it ideal for applications involving water-based media, acidic materials, alkali or saline solutions, as well as high relative humidity and temperatures. Its resistance to corrosion also makes it suitable for clean rooms and electronics manufacturing processes. The B.RUNN. BLOCK NRII features a low preload class C and standard accuracy class N without a ball chain or initial lubrication, allowing for straightforward integration into existing systems. The optimized entry zone geometry combined with a high number of balls ensures minimal variation in elastic deflection and reduced frictional oscillations under load. This model can accommodate attachments mounted from above the block and allows for long-term lubrication over several years due to its minimum quantity lubrication system with an integrated reservoir. It offers excellent dynamic load capacities and load moments based on DIN ISO standards, maintaining high performance even under varied loading directions thanks to its four-row ball configuration. With an overall length of 70 mm and compatibility across various sizes of profiled rail systems (including sizes A, B, E, H, K, N, S), the Bosch Rexroth ball runner block provides versatility and reliability for diverse linear motion requirements. Its design facilitates self-alignment to compensate for misalignments without compromising movement efficiency or load capacity.

Ball runner block, SLS, size 25, Resist NRII, accuracy standard, low preload, without ball chain

The ball runner block made of Resist NRII is corrosion-resistant and highly precise. Additionally, it is characterized by the following product features:
Size 25
Format SLS: Width = slimline, length = long, height = standard
Runner block body and all steel components made of corrosion-resistant steel as per DIN 10088
Preload class C1: Low preload
Accuracy class N: Standard
Without ball chain
Without preservation
Without initial lubrication
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 = 107.9 mm
Interchangeability: The runner block and the guide rails can be combined with each other with every accuracy.

Unpacked Weight: 0.650 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-R201221404-Ball runner block, SLS, size 25, Resist NRII, 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.

Characteristic features

Ball Rail Systems Resist NR II made from corrosion-resistant steel1) used specifically in conjunction with water-based media, heavily diluted acidic materials, alkali or saline solutions. These guides are also ideally suitable for use at relative humidities above 70 % and temperatures exceeding 30 °C. Such conditions are found mainly in cleaning plants, electroplating and pickling lines, vapor degreasing plants and refrigeration systems. Since no additional corrosion protection is required, Ball Rail Systems Resist NR II are ideally suited for use in clean rooms and general printed circuit board manufacturing. They are also suitable for other applications in the general packaging industry.

1) Resist NR II: Ball Runner Block body and Ball Guide Rail as well as all steel parts made of corrosion-resistant steel in accordance with DIN EN 10088

Area of application: For restricted space in the transverse direction
All metal parts are made of corrosion resistant steel
Maximum precision
Patented entry zone increases the travel accuracy up to a factor of six
Significantly reduced frictional oscillations and low friction force level, particularly under external load
Can be used on all SNS ball guide rails
Available in five common sizes
Lube fittings with metal threads on all sides
The same high load ratings in all four main directions of loading
Long-term lubrication is possible over several years
Minimum quantity lubrication system with integrated reservoir for oil lubrication
Optimized entry-zone geometry and high number of balls minimize variation in elastic deflection
Attachments on the ball runner block can be mounted from above

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Height of runner block	29.9
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 E2 (profiled rail systems)	50
Footnote friction coefficient μ	Without friction of seal
Permissible ambient temperature	-10 °C ... +80 °C
Format	SLS - slimline, long, standard height
Self-aligning for compensation of misalignments	Without self-alignment
Ball chain	Without ball chain (standard)
Friction coefficient μ	0,002 ... 0,003
Size B tolerance (profiled rail systems)	+0.5
Pitch T guide rail	60
Height of runner block with guide rail	36
Static load rating C0	31600
Dynamic torsional moment load capacity Mt	365
Size H2 with cover strip (profiled rail systems)	24.25
Preload class	C1 - Low preload
Size B1 (profiled rail systems)	79.5
Size H (profiled rail system)	36
Friction coefficient μ min.	0.002
Accuracy class	N - normal
Size K4 (profiled rail systems)	5.5
Size B with tolerance (profiled rail systems)	107,9 mm +0,5
Size K3 (profiled rail systems)	5.5
Size A1 (profiled rail systems)	24
Static torsional moment load capacity Mt0	450
Runner block or guide rail	Runner block
Width of runner block	48
Size E8 (profiled rail systems)	38.3
Length of runner block	107.9
Linear guide type	Ball rail system
Dynamic load capacity C	20000
Static longitudinal moment load capacity ML0	350
Size E9 (profiled rail systems)	11.5
Size E1 (profiled rail systems)	35
Material (profiled rail systems)	Corrosion resistant steel
Size N6 with tolerance (profiled rail systems)	15,2 mm ±0,5
Size S5 (profiled rail system)	7
Max. acceleration amax	500
Size A (profiled rail systems)	48
Size N6 tolerance (profiled rail systems)	±0.5
Size A3 (profiled rail systems)	12.5
Preload force	400
Size A2 (profiled rail systems)	23
Maximum permissible linear speed vmax	5
Lubrication	Without initial lubrication and without preservation
Size N3 (profiled rail systems)	9
Size N6 (profiled rail systems)	15.2
Friction coefficient μ max.	0.003
Size B (profiled rail systems)	107.9
Size H2 with cover strip (profiled rail systems)	24.45
Seal	SS – Standard seal
Size K2 (profiled rail systems)	21.95
Size V1	7.5
Productgroup ID	17
Size K1 (profiled rail systems)	20.8
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
Dynamic longitudinal moment load capacity ML	290
Size S2 (profiled rail systems)	M6
Permissible ambient temperature (min)	-10
Note: Max. acceleration amax	If F_comb◡> 2.8 • F_pr : a_max = 50 m/s²
Size T1 min (profiled rail systems)	13
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 S9 thread diameter x lead with (profiled rail systems)	M3x5
Internal product information	For LS – low-friction seal with external longitudinal seal
Weight	0.650
Nominal size	25
Size H1 (profiled rail systems)	29.9

Load capacities and load moments

Size		15	20	25	30	35
C	N	8500	16000	20000	26300	36500
C0	N	14000	24400	31600	40100	56200
Mt	Nm	82	265	365	590	1025
Mt0	Nm	132	310	450	695	1210
ML	Nm	64	190	290	420	710
ML0	Nm	104	230	350	495	840

	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	0.2	0.45	0.65	1.1	1.7
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)
	Sizes 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, sizes 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, sizes 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		72.6 mm +0.5	91 mm +0.5	107.9 mm +0.5	119.7 mm +0.5	139 mm +0.5
B1	mm	53.6	65.6	79.5	89.4	105.5
E1	mm	26	32	35	40	50
E2	mm	26	50		60	72
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	17.2	14.8	20.8	21	23.75
K2	mm	18.8	14.8	21.95	22.7	25.25
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		4.5	6	7	9
S9		M2.5x3.5	M3x5
T	mm	60			80
V1	mm	5	6	7.5	7	8

Load on bearing for calculating the service life

Loads and service life

General mounting instructions

Notes on lubrication

General Notes

Ball Rail Systems for sectors of the food industry, see the Ball Rail Systems NRFG catalog. Combinations of different accuracy classes: Combining Ball Guide Rails and Ball Runner Blocks of different accuracy classes results in different tolerances for dimensions H and A.3. See "Accuracy classes and their tolerances" Combinations of different materials: Combining Ball Guide Rails and Ball Runner Blocks made of different materials will change the load ratings, permitted loads and load moments. The lower value must be used in each case.

Scraper plates for Ball Rail Systems

R16.0 .10 ..

Scraper plates for Ball Rail Systems

R16.0 .10 ..

Material: Corrosion-resistant steel as per DIN EN 10088 Design: bright Precision design with a maximum gap dimension of 0.1 to 0.3 mm

CAD data

Instructions

Service

Front seals for Ball Rail Systems

R1619 .2. .0

Front seals for Ball Rail Systems

R1619 .2. .0

Material: Corrosion-resistant steel as per DIN EN 10088 with plastic seal Design: bright Two sections

CAD data

Instructions

Service

FKM seals, one piece for Rexroth Ball Rail Systems

R1619 620 30

FKM seals, one piece for Rexroth Ball Rail Systems

R1619 620 30

Material: Corrosion-resistant steel as per DIN EN 10088 and FKM seal

CAD data

Instructions

Service

FKM seals, two piece for Rexroth Ball Rail Systems

R1619 .20 30

FKM seals, two piece for Rexroth Ball Rail Systems

R1619 .20 30

Material: Corrosion-resistant steel as per DIN EN 10088 with FKM seal See Selection criteria/Seals for the area of application and resistance Simple assembly/removal on fixed ball guide rail

CAD data

Instructions

Service