BOSCH REXROTH
R166329410

$206.79

BOSCH REXROTH
Material:R166329410
Model:KWC-025-FKN-C0-N-2

Quantity in stock: 0

Ball runner block, FKN, size 25, steel CS, accuracy standard, preload-free, without ball chain

The ball runner block is highly precise and characterized by the following product features:
Size 25
Format FKN: Width = flange, length = short, height = low
Runner block body made of unalloyed steel CS
Preload class C0: Preload-free
Accuracy class N: Standard
Without ball chain
Preserved
Without initial lubrication
Without attachment element, left (front reference edge)
Without attachment element, right (front reference edge)
45° angular lube nipples loosely attached.
Runner block body in standard version
Overall length of the runner block = 62.0 mm
Interchangeability: The runner block and the guide rails can be combined with each other with every accuracy.

Unpacked Weight: 0.450 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-R166329410-Ball runner block, FKN, size 25, steel CS, accuracy standard, preload-free, 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.

Area of application: For cases of restricted space avialability in the upward and longitudinal direction
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
Long-term lubrication is possible over several years
Lube fittings with metal threads on all sides
End-face fastening thread for all attachments
Can be used on all SNS/SNO ball guide rails
Integrated all-round sealing
Preload classes: C0 (without preload, clearance) and C1 (moderate preload)
Optional integrated, inductive and wear-free measuring system
Optimized entry-zone geometry and high number of balls minimize variation in elastic deflection

Data Sheet	Download Data Sheet
2D CAD	Download 2D CAD
2D CAD	Download 2D CAD
3D CAD	Download 3D CAD
3D CAD	Download 3D CAD
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Height of runner block	26.5
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.
Footnote friction coefficient μ	Without friction of seal
Permissible ambient temperature	-10 °C ... +80 °C
Format	FKN - flange, short, low
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
Footnote static load capacity C0	100 °C admissible for short time. For operation at negative temperatures, please consult us.
Pitch T guide rail	60
Height of runner block with guide rail	33
Static load rating C0	21200
Dynamic torsional moment load capacity Mt	280
Size H2 with cover strip (profiled rail systems)	24.25
Preload class	C0 – Without preload (clearance)
Size footnote	BSHP ball runner block
Size B1 (profiled rail systems)	38.6
Size H (profiled rail system)	33
Friction coefficient μ min.	0.002
Accuracy class	N - normal
Size K4 (profiled rail systems)	4.1
Size B with tolerance (profiled rail systems)	62 mm +0,5
Size K3 (profiled rail systems)	4.1
Size A1 (profiled rail systems)	36.5
Static torsional moment load capacity Mt0	300
Runner block or guide rail	Runner block
Width of runner block	73
Size E8 (profiled rail systems)	38.3
Length of runner block	62
Linear guide type	Ball rail system
Dynamic load capacity C	19800
Static longitudinal moment load capacity ML0	140
Size E9 (profiled rail systems)	8.5
Size N1 (profiled rail systems)	9.3
Size E1 (profiled rail systems)	60
Material (profiled rail systems)	Carbon steel
Size N6 with tolerance (profiled rail systems)	15,2 mm ±0,5
Size S5 (profiled rail system)	7
Max. acceleration amax	250
Size A (profiled rail systems)	73
Size N6 tolerance (profiled rail systems)	±0.5
Size A3 (profiled rail systems)	25
Size A2 (profiled rail systems)	23
Maximum permissible linear speed vmax	3
Lubrication	With preservation and without initial lubrication
Size S1 (profiled rail systems)	6.7
Size N6 (profiled rail systems)	15.2
Friction coefficient μ max.	0.003
Size B (profiled rail systems)	62
Size H2 with cover strip (profiled rail systems)	24.45
Seal	SS – Standard seal
Size K2 (profiled rail systems)	25
Size V1	7.5
Productgroup ID	17
Size K1 (profiled rail systems)	24.5
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	130
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
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	0.450
Nominal size	25
Size H1 (profiled rail systems)	26.5

Load capacities and load moments

Size		20	25 1)
C	N	9600	19800
C0	N	13600	21200
Mt	Nm	120	280
Mt0	Nm	170	300
ML	Nm	40	130
ML0	Nm	58	140

1)	BSHP Ball Runner Block
	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		20	25 1)
amax 2)	m/s²	250
vmax	m/s	3
m	kg	0.25	0.45
μ 3)		0.002 ... 0.003
Operating conditions
Size		20	25 1)
Permissible ambient temperature (min ... max) 4)		-10 °C ... +80 °C

1)	BSHP Ball Runner Block
2)	If Fcomb > 2.8 • Fpr : amax = 50 m/s2
3)	Without friction of seal
4)	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 20 - 25: Ø 5 · 1.0 (mm)
	Open lube port if necessary (see general technical notes and information in the "Maintenance" section).
b)	Lube nipple, size 20 - 25:
	Funnel-type lube nipple DIN 3405-B M3x5, B2 = 8 mm
	Lube port with additional anti-twist feature.
	When using different lube nipples, pay attention to the screw-in depth of 5 mm!
	The lube nipple is included in the scope of delivery (not installed).
	Size 20: Connection is possible on end-face.
	Size 25: Connection is possible on all sides.

Dimensions

Size		20	25 1)
A	mm	59	73
A1	mm	29.5	36.5
A2	mm	20	23
A3	mm	19.5	25
B		55 mm +0.5	62 mm +0.5
B1	mm	31.9	38.6
E1	mm	49	60
E8	mm	30.5	38.3
E9	mm	5.6	8.5
H	mm	28	33
H1	mm	23	26.5
Dimension H2 with cover strip	mm	20.75	24.45
Dimension H2 without cover strip	mm	20.55	24.25
K1	mm	20.1	24.5
K2	mm	-	25
K3	mm	3.6	4.1
K4	mm	-	4.1
N1	mm	7.7	9.3
N6		13.2 mm ±0.5	15.2 mm ±0.5
S1	mm	5.3	6.7
S2		M6	M8
ØS5	mm	6	7
S9		M3x5
T	mm	60
V1	mm	6	7.5