CATALOG No.249-8E
Caged Ball LM GuideBall Cage EffectLightweight, Compact Type SRSNew Size Available: SRS5 Series
Compliant withNew Accuracy Standards
1
Rotary ball bearing
Conventional structure Caged Ball structure
With the Caged Ball LM Guide, the use of a ball cageallows lines of evenly spaced balls to circulate, thus toeliminating friction between the balls. In addition, grease held in a space between the ballcirculation path and the ball cage (grease pocket) isapplied on the contact surface between each ball andthe ball cage as the ball rotates, forming an oil film onthe ball surface. This minimizes the risk of oil-filmbreak.
Caged Ball LM Guide
Extremely low bearing stressachieved with ball-to-cage contact
Oil-film contact
Conventional structure●Adjacent balls contact each other
at a point. As a result, contactstress is high and the oil filmbreaks due to friction.●The service life becomes shorter.
Caged Ball structure●The service life is prolonged due to the elimination of wear caused
by friction between balls.●The absence of friction between balls results in reduced heat
generation during high-speed rotation.●The absence of friction between balls eliminates collision noise of
the balls.●The even spacing of the balls enables them to move smoothly.●Retention of lubricant in the ball cage ensures a long service life.
Ball
High bearing stress due toball-to-ball contact
Ball Cage EffectThe early forms of ball bearings were full-ball types without ball cages. Friction between balls caused loudnoise, made high-speed rotation impossible and shortened the service life. Twenty years later, a Caged Balldesign was developed for ball bearings. The new design enabled high-speed rotation at a low noise level,and extended the service life despite the reduced number of balls used. It marked a major development inthe history of ball bearings. Similarly, the quality of needle bearings was significantly improved by the caged needle structure.With cage-less, full-ball types of ball bearings, balls make metallic contact with one another andproduce loud noise. In addition, they rotate in opposite directions, causing the sliding contact between twoadjacent balls to occur at a speed twice the ball-spinning rate. It results in severe wear and shortens theservice life. In addition, without a cage, balls make point contact to increase bearing stress, thus facilitatingbreakage of the oil film. In contrast, each caged ball contacts the cage over a wide area. Therefore, the oilfilm does not break, the noise level is low and balls can rotate at a high speed, resulting in a longservice life.
Long Service Life and Long-termMaintenance-free Operation
Superbly High Speed
Low Noise, Acceptable Running Sound
Smooth Motion
Low Dust Generation
2
Lightweight, Compact TypeCaged Ball LM Guide SRS
Ball cage
Ball
End seal
Endplate
LM block
LM rail
Side seal
Compact type ModelSRS-M
Wide type ModelSRS-WM
Structure of Model SRS
Caged Ball LM Guide model SRS has a structure where two raceways are incorporated into the compactbody, enabling the model to receive loads in all directions, and to be used in locations where a momentis applied with a single rail. In addition, use of ball cages eliminates friction between balls, thusachieving high speed, low noise, acceptable running sound, long service life, and long-termmaintenance-free operation.
● Low dust generation,anticorrosionUse of ball cages eliminates friction between balls andretains lubricant, thus achieving low dust generation.In addition, the LM block and LM rail use stainlesssteel, which is highly resistant to corrosion.
● CompactSince SRS has a compact structure where the railcross section is designed to be low and that containsonly two rows of balls, it can be installed in space-saving locations.
● LightweightSince part of the LM block (e.g., around the ball reliefhole) is made of resin and formed through insertmolding, SRS is a lightweight, low inertia type of LMGuide.
3
Model SRS WM Model SRS M
Model SRS5M
L
W
Model SRS5WM
The smallest model of Caged Ball LM Guide.It is dimensionally (mounting) interchangeable withmodel RSR5M.
This model has a larger overall LM block length(L), width (W), rated load and permissible momentthan model SRS5M. It is dimensionally(mounting) interchangeable with RSR5WM.
SRS OutlineModel SRS - Product Overview
The most compact type among the Caged Ball LM Guide seriesLightweight, low-inertia structureMajor applications Semiconductor manufacturing machine / optical stage / medical equipment /
IC bonder, etc.
4
SRS OUTLINEModel SRS - Product Overview
●SRS 7M ●SRS 15M●SRS 9M ●SRS 20M●SRS 12M ●SRS 25M
Model SRS-MStandard type
Model SRS-NLong type
●SRS 9N●SRS 12N●SRS 15N
Model SRS-WNWide, long type
●SRS 9WN●SRS 12WN●SRS 15WN
A standard type of SRS.
Model SRS-WMWide type
●SRS 7WM ●SRS 15WM●SRS 9WM●SRS 12WM
It has a longer overall LM blocklength (L), a greater width and alarger rated load and permissiblemoment than SRS-M.
This model has a larger overall LMblock length (L), rated load andpermissible moment than modelSRS-M.
This model has a larger overall LMblock length (L), rated load andpermissible moment than modelSRS-WM.
L
L
W
L
Note: Full-ball type (with noball cage) for modelsSRS-M/WM is alsoavailable. If desiringthe full-ball type, specify“SRS-G”type whenmaking an order.However, since SRS-G type does not havea ball cage, its dynamicload rating is smallerthan models SRS-M/WM.
5
*1:Dimensional table formodel SRS
Model SRS5M/5WM→ pages 11-
Model SRS-M/N→ pages 13-
Model SRS-WM/WN→ pages 15-
where PE :Equivalent load [N]
⋅Radial direction⋅Reverse-radial direction⋅Lateral direction
PR :Radial load [N]PL :Reverse-radial load [N]PT :Lateral load [N]X, Y:Equivalent factor
(see the table below)
PE=X・PR(PL)+Y・PT
Rated Loads in All DirectionsModel SRS is capable of receivingloads in all four directions: radial,reverse-radial and lateral directions.
Its basic dynamic load rating is representedby the symbol in the radial direction indicatedin the figure on the right, and the actual valueis provided in the dimensional table*1 for modelSRS. The values in the reverse-radial andlateral directions are obtained from table 1.
Equivalent LoadWhen the LM block of model SRSreceives a radial load and a lateralload, or a reverse-radial load and alateral load, simultaneously, theequivalent load is obtained from theequation below.
CL
CT
C0L
C0T
CT
C0T
C
C0PL PR
PT PT
Radial directionReverse-radial direction
Lateral direction
Lateral direction
Rated Loads of Model SRS in All Directions
Direction
Radial direction
Reverse-radial direction
Lateral direction 1(5M/5WM/7M/7WM/9M/9N/9WM/9WN/20M)
Lateral direction 2(12M/12N/12WM/12WN/15M/15N/15WM/15WN/25M)
Basic dynamic load rating
C
CL=C
CT=1.19C
CT=C
C0
C0L=C0
C0T=1.19C0
C0T=C0
Basic static load rating
Equivalent Factor of Model SRS
Radial and reverse-radial directions
Lateral direction
Equivalent load PE
5M/5WM/7M/7WM/9M/9N/9WM/9WN/20M
12M/12N/12WM/12WN/15M/
15N/15WM/15WN/25M
5M/5WM/7M/7WM/9M/9N/9WM/9WN/20M
12M/12N/12WM/12WN/15M/
15N/15WM/15WN/25M
Model No. X
1
1
1.192
1
Y
0.839
1
1
1
6
SRS OUTLINEModel SRS - Product Overview
The service life of an LM Guide is subject to variations even under the sameoperational conditions. Therefore, it is necessary to use the rated life definedbelow as a reference value for obtaining the service life of the LM Guide.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
60 50 40 30 20 10Raceway hardness (HRC)
Har
dn
ess
fact
or
fH
Fig. 1
■fH:Hardness factorTo ensure the achievement of the optimum load capacity of the LM Guide,the raceway hardness must be between 58 and 64 HRC.At hardness below this range, the basic dynamic and static load ratingsdecrease. Therefore, the rating values must be multiplied by therespective hardness factors (fH).Since the LM Guide has sufficient hardness, the fH value for the LM Guideis normally 1.0 unless otherwise specified.
■fC:Contact factorWhen multiple LM blocks are used in close contact with each other, it isdifficult to achieve uniform load distribution due to moment loads andmounting-surface accuracy. When using multiple blocks in close contactwith each other, multiply the basic load rating (C or C0) by thecorresponding contact factor indicated in Table 1.Note: When uneven load distribution is expected in a large machine, consider using a contact
factor from Table 1.
■fT:Temperature factorSince the service temperature of Caged Ball LM Guides is normally 80°Cor below, the fT value is 1.0.
■fW:Load factorIn general, reciprocating machines tend to produce vibrations or impactduring operation. It is especially difficult to accurately determine allvibrations generated during high-speed operation and impacts producedeach time the machine starts and stops. Therefore, where the effects ofspeed and vibration are estimated to be significant, divide the basicdynamic load rating (C) by a load factor selected from Table 2, whichcontains empirically obtained data.
●Rated lifeThe rated life means the total travel distancethat 90% of a group of units of the same LMGuide model can achieve without flaking(scale-like exfoliation on the metal surface)after individually running under the sameconditions.
●Service life timeOnce the rated life (L) has been obtained, theservice life time can be obtained using theequation on the right if the stroke length andthe number of reciprocations are constant.
L = ( · )3 50CPC
fH · fT · fC
fW
Lh =L 106
2 RS n1 60
L : Rated life [km]C : Basic dynamic load rating*1 [N]PC : Calculated load [N]fH : Hardness factor (see Fig. 1)fT : Temperature factorfC : Contact factor (see Table 1)fW : Load factor (see Table 2)
Lh : Service life time [h]Rs : Stroke length [mm]n1 : No. of reciprocations per min [min-1]
Table 1 Contact Factor (fC)
Table 2 Load Factor(fW)
Number of blocks used in close contact
2
3
4
5
6 or more
Normal use
Contact factor fC
0.81
0.72
0.66
0.61
0.6
1
Faint
Weak
Moderate
Strong
Very slowV≦0.25m/s
Slow0.25<V≦1m/s
Medium1<V≦2m/s
FastV>2m/s
1 to 1.2
1.2 to 1.5
1.5 to 2
2 to 3.5
Vibration/impact Speed (V) fW
*1: Basic dynamic load rating(C)
It refers to a load with aconstant magnitude anddirection under which therated life (L) of a group ofidentical LM Guide unitsindependently operating is50 km.
Service life
7
Radial Clearance Standard*1: Preload
Preload is an internal loadapplied to the roll ingelements (balls) of an LMblock in advance in order toincrease its rigidity.The clearance of all modelSRS units is adjusted to thedesignated value beforebeing shipped. Therefore, itis unnecessary to adjust thepreload.
Since the radial clearance of an LM Guidegreatly affects the running accuracy, loadcarrying capacity and rigidity of the LMGuide, it is important to select anappropriate clearance according to theapplication.
In general, selecting a negative clearance (i.e., apreload*1 is applied) while taking into accountpossible vibrations and impact generated fromreciprocating motion favorably affects the servicelife and the accuracy.
0 to +1.5 – 1 to 00 to +1.5 – 1 to 0
–2 to +2 – 3 to 0–2 to +2 – 3 to 0–2 to +2 – 4 to 0–2 to +2 – 4 to 0–3 to +3 – 6 to 0–3 to +3 – 6 to 0–5 to +5 –10 to 0–5 to +5 –10 to 0–5 to +5 –10 to 0–7 to +7 –14 to 0
5M5WM7M7WM9M/N9WM/WN12M/N12WM/WN15M/N15WM/WN20M25M
Indication symbolModel No.
NormalNo symbol
Light preloadC1
Unit: μm
Radial clearance
The accuracy of model SRS is specified in termsof running parallelism (*1), dimensional tolerancefor height and width, and height and widthdifference between a pair (*2,*3) when two or moreLM blocks are used on one rail or when two ormore rails are mounted on the same plane.
The accuracy of model SRS is classified into normalgrade (no symbol), high grade (H) and precision grade(P) as indicated in the table below.
8
SRS OUTLINEModel SRS - Product Overview
Dimensional tolerance for height M ±0.03 - ±0.015
Difference in height M 0.015 - 0.005
Dimensional tolerance for width W2 ±0.03 - ±0.015
Difference in width W2 0.015 - 0.005
Running parallelism of as shown in the
surface Ç against surface Å table on the right
Running parallelism of as shown in the
surface Î against surface ı table on the right
LM Rail Length and Running Parallelism by Accuracy of model SRS
7912152025
Unit: mm
Dimensional tolerance for height M ±0.04 ±0.02 ±0.01
Difference in height M 0.03 0.015 0.007
Dimensional tolerance for width W2 ±0.04 ±0.025 ±0.015
Difference in width W2 0.03 0.02 0.01
Running parallelism of as shown in the
surface Ç against surface Å table on the right
Running parallelism of as shown in the
surface Î against surface ı table on the right
Accuracy standard Normal grade High-accuracy grade Precision gradeItem No symbol H P
ModelNo.
LM rail length[mm] Running Parallelism Values[μm]Above Or less Normal grade High-accuracy grade Precision grade
Model SRS7/9/12/15/20/25
LM Rail Length and Running Parallelism by Accuracy of model SRS
AB
D
C
M
W2
Accuracy Standard
5
Unit: mm
Accuracy standard Normal grade High-accuracy grade Precision gradeItem No symbol H P
ModelNo.
Model SRS5
ー 25 2.5 1.5
25 50 3.5 2
50 100 5.5 3
100 150 7 4
150 200 8.4 5
LM rail length[mm] Running Parallelism Values[μm]Above Or less Normal grade Precision grade
Note: "—" indicates not available.
— 40 8 4 1
40 70 10 4 1
70 100 11 4 2
100 130 12 5 2
130 160 13 6 2
160 190 14 7 2
190 220 15 7 3
220 250 16 8 3
250 280 17 8 3
280 310 17 9 3
310 340 18 9 3
340 370 18 10 3
370 400 19 10 3
400 430 20 11 4
430 460 20 12 4
460 520 21 12 4
520 550 22 12 4
550 640 22 13 4
640 670 23 13 4
670 700 23 13 5
700 820 23 14 5
820 850 24 14 5
850 970 24 15 5
970 1030 25 16 5
1030 1150 25 16 6
1150 1330 26 17 6
1330 1420 27 18 6
1420 1510 27 18 7
1510 1800 28 19 7
*1: Running parallelism
It refers to the parallelismerror between the LM blockand the LM rail datum planewhen the LM block travelsthe whole length of the LMrail with the LM rail securedon the reference datumplane using bolts.
*2: Difference in height M
It indicates the differencebetween the minimum andmaximum values of height(M) of each of the LMblocks used on the sameplane in combination.
*3: Difference in width W2
It indicates the differencebetween the minimum andmaximum values of thewidth (W2) between each ofthe LM blocks, mounted onone LM rail in combination,and the LM rail.
9
Normally, the mounting base for the LM rail and the LM block has a datum planeon the side face of the shoulder of the base in order to allow easy installation andhighly accurate positioning.
The corner of the mounting shoulder must be machined to have a recess, or machined to besmaller than the corner radius "r," to prevent interference with the chamfer of the LM rail or the LMblock.
Shoulder Height of the Mounting Base and the Corner Radius
Shoulder for the LM blockShoulder for the LM rail
r2
r2
r1
r1
H2H1
H3
Model No.Corner radius for the LM rail
r1(max)
Corner radius for the LM block
r2(max)
Shoulder heightfor the LM rail
H1
Shoulder height for the LM block
H2 H3
Unit: mm
5M
5WM
7M
7WM
9M/N
9WM/WN
12M/N
12WM/WN
15M/N
15WM/WN
20M
25M
0.1
0.1
0.1
0.1
0.1
0.1
0.3
0.3
0.3
0.3
0.3
0.5
0.3
0.2
0.2
0.1
0.3
0.5
0.2
0.3
0.4
0.3
0.5
0.5
1.2
1.2
0.9
1.4
0.5
2.5
1.5
2.5
2.2
2.2
3
4.5
2
2.5
3.3
3.8
4.9
4.9
5.7
5.7
6.5
6.5
8.7
10.5
1.5
1.5
1.3
1.8
0.9
2.9
2
3
2.7
2.7
3.4
5
10
SRS OUTLINEModel SRS - Product Overview
Error Allowance in the Parallelism Between Two RailsThe table shows error allowances in parallelism(P) between two rails that will not affect theservice life in normal operation.
The values in the table each indicate the errorallowance (S) in vertical level between tworails per 200 mm of the axis-to-axis distance,and are proportional to the axis-to-axisdistance.
Flatness of the LM Rail and the LM Block Mounting SurfaceThe values in the table apply when theclearance is a normal clearance. If theclearance is clearance C1 and two rails areused in combination, we recommend using50% or less of the value in the table.
Since SRS has Gothic-arch grooves, anyaccuracy error in the mounting surface maynegatively affect the operation. Therefore, werecommend using SRS on a highly accuratemounting surface.
Error Allowance in Vertical Level Between Two Rails
Model No. Clearance C1 Normal clearance
5M
5WM
7M
7WM
9M/N
9WM/WN
12M/N
12WM/WN
15M/N
15WM/WN
20M
25M
—
—
—
—
3
3
5
5
6
6
8
10
2
2
3
3
4
4
9
9
10
10
13
15
Unit:μm
Model No. Clearance C1 Normal clearance
5M
5WM
7M
7WM
9M/N
9WM/WN
12M/N
12WM/WN
15M/N
15WM/WN
20M
25M
—
—
—
—
6
6
12
12
20
20
30
40
20
20
25
25
35
35
50
50
60
60
70
80
Unit:μm
Model No. Flatness
5M
5WM
7M
7WM
9M/N
9WM/WN
12M/N
12WM/WN
15M/N
15WM/WN
20M
25M
0.015/200
0.015/200
0.025/200
0.025/200
0.035/200
0.035/200
0.050/200
0.050/200
0.060/200
0.060/200
0.070/200
0.070/200
Unit: mm
P
200
S
11
Unit: mm
2 SRS7M QZ UU C1 +100L P M-Ⅱz , .mnbvcx
Model No.
Outer dimensions
Basic load rating Static permissible moment [N-m]*2
LM block dimensions
LM rail dimensions
HeightM
C[N]
C0[N]
MA MB MC1 block 2 blocks in
close contact 1 block 1 block2 blocks inclose contact
WidthW
LengthL B S×R L1 K N H3
WidthW1 W2
HeightM1
PitchF d1×d2×h
SRS 5M
SRS 7M
6
8
439
1510
468
1290
0.74
3.09
5.11
17.2
0.86
3.69
5.99
17.3
1.21
5.02
12
17
16.9
23.4
8
12
C
—
8
M2×1.5
M2×2.3
8.8
13.4
T
1.7
3.3
4.5
6.7
0.93
1.6
1.5
1.3
3.5
5
4
4.7
15
15
2.4×3.5×1
2.4×4.2×2.3
Model SRS5M/7MDimensional Table for Model SRS5M/7M
W1W2
(K)
H3M
WB L1
L
M1
h
F
φd2
φd1
2-S×RN
T
Unit: mm
Model No.
SRS 5M
SRS 7M
Mass
LM block[kg]
LM rail[kg/m]
0.002
0.009
0.13
0.25
Model SRS5M
Model SRS7M
LengthMax*1
200
300
W1
H3
B
(K) MT
N
W
W2
4-S×R
MC
MB
L
CL1
φd2
φd1
M1
F
h
MA
MC
MB
MA
Model No.
SRS 5M
SRS 7M
Nominal model number of screw Screw depth [mm] Reference tightening torque [N・m]*
M2M2
1.52.3
0.40.4
Reference tightening torque
* If the bolt is tightened with a torque exceeding the specified tightening torque, it may affect the accuracy. Be sure to tighten the bolt with a torque below the specified value.
● The following table shows a reference bolt-tightening torque for mounting the LM block of model SRS 5M/7M.
5 0–0.02
7 0–0.02
*1 The maximum length under "Length" indicates the standard maximum length of an LM rail.*2 Static permissible moment:1 block: static permissible moment value with 1 LM block
Double blocks: static permissible moment value with 2 blocks closely contacting with each other
Note Since the LM block, LM rails, and balls are stainless steel, this model is highly resistant to corrosion and the environment.
Note This model number indicates that an LM block and an LM rail constitute one set.
■ Example of model numbercoding
zNo. of LM blocks used on the same rail xModel number cWith QZ Lubricator (see page 21) vDust prevention accessory symbol (seepage 20) bRadial clearance symbol (see page 7) nLM rail length (in mm) mAccuracy symbol (see page 8) ,LM rail is made of stainlesssteel .No. of rails used on the same plane
12
T
2-SW
N
W2 W1
(K) H3
M
LL1
φd2
φd1
C
F
M1 h
Model SRS5WM/7WMDimensional Table for Model SRS5WM/7WM
2 SRS7WM QZ UU C1 +200L P M-Ⅱz , .mnbvcx
Model SRS5WM
Model SRS7WMUnit: mm
Model No.
Outer dimensions
Basic load rating Static permissible moment [N-m]*2
LM block dimensions
LM rail dimensions
HeightM
C[N]
C0[N]
MA MB MC1 block 2 blocks in
close contact 1 block 1 block2 blocks inclose contact
WidthW
LengthL B S×R L1 K N H3
WidthW1 W2
HeightM1
PitchF d1×d2×h
SRS 5WM
SRS 7WM
6.5
9
584
2010
703
1940
1.57
6.47
9.59
22.7
1.83
7.71
11.24
22.7
3.58
14.33
17
25
22.1
31
—
19
C
6.5
10
M3通シ
M3×2.8
13.7
20.4
T
2.7
3.8
5
7.2
1.1
1.8
1.5
1.8
3.5
5.5
4
5.2
20
30
3×5.5×3
3.5×6×3.2
Unit: mm
Model No.
SRS 5WM
SRS 7WM
Mass
LM block[kg]
LM rail[kg/m]
0.005
0.018
0.27
0.56
LengthMax*1
200
400
H3
B
(K) MT
W
W2 W1
4-S×R
N
MC
MB
L
CL1
φd2
φd1
M1
F
h
MA
MC
MB
MA
Model No.
SRS 5WM
SRS 7WM
Nominal model number of screw Screw depth [mm] Reference tightening torque [N・m]*
M3M3
2.32.8
0.40.4
Reference tightening torque
* If the bolt is tightened with a torque exceeding the specified tightening torque, it may affect the accuracy. Be sure to tighten the bolt with a torque below the specified value.
● The following table shows a reference bolt-tightening torque for mounting the LM block of model SRS 5WM/7WM.
10 0–0.02
14 0–0.02
*1 The maximum length under "Length" indicates the standard maximum length of an LM rail.*2 Static permissible moment:1 block: static permissible moment value with 1 LM block
Double blocks: static permissible moment value with 2 blocks closely contacting with each other
Note Since the LM block, LM rails, and balls are stainless steel, this model is highly resistant to corrosion and the environment.
Note This model number indicates that an LM block and an LM rail constitute one set.
■ Example of model numbercoding
zNo. of LM blocks used on the same rail xModel number cWith QZ Lubricator (see page 21) vDust prevention accessory symbol (seepage 20) bRadial clearance symbol (see page 7) nLM rail length (in mm) mAccuracy symbol (see page 8) ,LM rail is made of stainlesssteel .No. of rails used on the same plane
13
Model SRS-M/SRS-NDimensional Table for Model SRS-M/SRS-N
MC
MB
Model No.
Outer dimensions LM block dimensions
Height
M
Width
W
Length
L B C S✕R L1 T K N H3
SRS 9M
SRS 9N
SRS 12M
SRS 12N
SRS 15M
SRS 15N
SRS 20M
SRS 25M
10
10
13
13
16
16
20
25
20
20
27
27
32
32
40
48
30.8
40.8
34.4
47.1
43
60.8
50
77
15
15
20
20
25
25
30
35
10
16
15
20
20
25
25
35
M3✕2.8
M3✕2.8
M3✕3.2
M3✕3.2
M3✕3.5
M3✕3.5
M4✕6.0
M6✕7.0
19.8
29.8
20.6
33.3
25.7
43.5
34
56
4.9
4.9
5.7
5.7
6.5
6.5
9
11
9.1
9.1
11
11
13.3
13.3
16.6
20
2.4
2.4
3
3
3
3
4
5
0.9
0.9
2
2
2.7
2.7
3.4
5
Note Since the LM block, LM rails, and balls are stainless steel, this model is highly resistant to corrosion and the environment.
Note This model number indicates that an LM block and an LM rail constitute one set (i.e., the required number of sets when 2rails are used in parallel is 2).Those models equipped with QZ Lubricator cannot have a grease nipple.
■ Example of model numbercoding
zNo. of LM blocks used on the same rail xModel number cWith QZ Lubricator (see page 21) vDust prevention accessory symbol (seepage 20) bRadial clearance symbol (see page 7) nLM rail length (in mm) mAccuracy symbol (see page 8) ,LM rail is made of stainlesssteel .No. of rails used on the same plane
2 SRS20M QZ UU C1 +220L P M-Ⅱz , .mnbvcx
W1
H3
B
(K) M
T
N
W
W2
4-S×R
14
L
C
L1
φd2
φd1
M1
F
h
MA
Width
W1 W2
Height
M1
Pitch
F d1✕d2✕h
LM rail dimensionsBasic load
ratingStatic permissible moment [N-m]*2 Mass
C
[kN]
Length*1
Max
C0
[kN]
MC
1 block
LM block
[kg]
LM rail
[kg/m]
9 0–0.02
9 0–0.02
12 0–0.02
12 0–0.02
15 0–0.02
15 0–0.02
20 0–0.03
23 0–0.03
5.5
5.5
7.5
7.5
8.5
8.5
10
12.5
5.5
5.5
7.5
7.5
9.5
9.5
11
15
20
20
25
25
40
40
60
60
3.5✕6✕3.3
3.5✕6✕3.3
3.5✕6✕4.5
3.5✕6✕4.5
3.5✕6✕4.5
3.5✕6✕4.5
6✕9.5✕8
7✕11✕9
2.69
3.48
4
5.82
6.66
9.71
7.75
16.5
1000
1000
1340
1340
1430
1430
1800
1800
2.31
3.34
3.53
5.3
5.7
8.55
9.77
20.2
7.82
15.5
12
28.4
26.2
59.7
54.3
177
9.03
17.9
12
28.4
26.2
59.7
62.4
177
43.9
81.4
78.5
151
154
312
296
932
50.8
94.3
78.5
151
154
312
341
932
10.6
15.3
23.1
34.7
40.4
60.7
104
248
0.016
0.027
0.027
0.049
0.047
0.095
0.11
0.24
0.32
0.32
0.65
0.65
0.96
0.96
1.68
2.6
Unit: mm
Note
Note
2 blocks inclose contact
2 blocks inclose contact1 block 1 block
If a grease nipple is required, indicate "with grease nipple" (available for modelsSRS 15M/15N/20M/25M). If a greasing hole is required, indicate "with greasing hole" (available for modelsSRS 9M/9N/12M/12N).
*1 The maximum length under "Length" indicates the standard maximum length of an LM rail.
*2 Static permissible moment: 1 block: static permissible momentvalue with 1 LM block
2 blocks: static permissible momentvalue with 2 blocks closelycontacting with each other
SRS-G Basic Load Ratings
SRS 9GM
SRS 12GM
SRS 15GM
SRS 20GM
SRS 25GM
2.07
3.36
5.59
5.95
13.3
2.32
3.55
5.72
9.4
22.3
Basic load ratingModel No. C
[kN]C0
[kN]
Full-ball type (with no ball cage) for modelSRS-M is also available. If desiring the full-balltype, specify "SRS-G" type when making anorder. However, since SRS-G type does nothave a ball cage, its dynamic load rating issmaller than model SRS-M.
MA MB
15
Models SRS9,12WM/WN Model SRS15WM/WN
MC
MB
MC
MB
2 SRS15WM QZ UU C1 +550L P M-Ⅱ
Model No.
Outer dimensions LM block dimensions
Height
M
Width
W
Length
L B C S✕R L1 T K N H3
SRS 9WM
SRS 9WN
SRS 12WM
SRS 12WN
SRS 15WM
SRS 15WN
12
12
14
14
16
16
30
30
40
40
60
60
39
50.7
44.5
59.5
55.5
74.5
21
23
28
28
45
45
12
24
15
28
20
35
M3✕2.8
M3✕2.8
M3✕3.5
M3✕3.5
M4✕4.5
M4✕4.5
27
38.7
30.9
45.9
38.9
57.9
4.9
4.9
5.7
5.7
6.5
6.5
9.1
9.1
11
11
13.3
13.3
2.3
2.3
3
3
3
3
2.9
2.9
3
3
2.7
2.7
Note Since the LM block, LM rails, and balls are stainless steel, this model is highly resistant to corrosion and the environment.
Note This model number indicates that an LM block and an LM rail constitute one set (i.e., the required number of sets when 2rails are used in parallel is 2).Those models equipped with QZ Lubricator cannot have a grease nipple.
■ Example of model numbercoding
zNo. of LM blocks used on the same rail xModel number cWith QZ Lubricator (see page 21) vDust prevention accessory symbol (seepage 20) bRadial clearance symbol (see page 7) nLM rail length (in mm) mAccuracy symbol (see page 8) ,LM rail is made of stainlesssteel .No. of rails used on the same plane
z x , .mnbvc
Model SRS-WM/SRS-WNDimensional Table for Model SRS-WM/SRS-WN
H3 H3
B
(K) T
M
W
B
(K) MT
W
W1W2
W3
W2W1
4-S×R4-S×R
NN
16
L
C
L1
φd2
φd1
M1
F
h
MA
Width
W1 W2
Height
M1
Pitch
F d1✕d2✕h
LM rail dimensionsBasic load
ratingStatic permissible moment [N-m]*2 Mass
C
[kN]
Length
Max*1
C0
[kN] 1 block
LM block
[kg]
LM rail
[kg/m]
18 0–0.02
18 0–0.02
24 0–0.02
24 0–0.02
42 0–0.02
42 0–0.02
6
6
8
8
9
9
W3
—
—
—
—
23
23
7.5
7.5
8.5
8.5
9.5
9.5
30
30
40
40
40
40
3.5✕6✕4.5
3.5✕6✕4.5
4.5✕8✕4.5
4.5✕8✕4.5
4.5✕8✕4.5
4.5✕8✕4.5
3.29
4.2
5.48
7.13
9.12
12.4
1000
1000
1430
1430
1800
1800
3.34
4.37
5.3
7.07
8.55
12.1
14
25.1
26.4
49.2
51.2
106
16.2
29.1
26.4
49.2
51.2
106
78.6
130
143
249
290
532
91
151
143
249
290
532
31.5
41.3
66.5
88.7
176
250
0.031
0.049
0.055
0.091
0.13
0.201
1.01
1.01
1.52
1.52
2.87
2.87
Unit: mm
2 blocks inclose contact
2 blocks inclose contact1 block 1 block
SRS 9WGM
SRS 12WGM
SRS 15WGM
2.67
4.46
7.43
3.35
5.32
8.59
Basic load ratingModel No. C
[kN]C0
[kN]
SRS-G Basic Load RatingsNote
Note
If a grease nipple is required, indicate "with grease nipple" (available for modelsSRS 15WM/15WN). If a greasing hole is required, indicate "with greasing hole" (available for modelsSRS 9WM/9WN/12WM/12WN)
*1 The maximum length under "Length" indicates the standardmaximum length of an LM rail.
*2 Static permissible moment: 1 block: static permissible momentvalue with 1 LM block
2 blocks: static permissible momentvalue with 2 blocks closelycontacting with each other
Full-ball type (with no ball cage) for modelSRS-WM is also available. If desiring the full-ball type, specify "SRS-G" type when makingan order. However, since SRS-G type does nothave a ball cage, its dynamic load rating issmaller than model SRS-WM.
MCMA MB
17
The table below shows the standard LM rail lengths and the maximum lengths of model SRSvariations. If the maximum length of the desired LM rail exceeds them, connected rails will beused. Contact THK for details.For the G dimension when a special length is required, we recommend selecting the corresponding Gvalue from the table. The longer the G dimension is, the less stable the G area may become afterinstallation, thus adversely affecting accuracy.
G F F
L0
G
SRS-M/WMStandard Length and Maximum Length of the LM Rail
Note 1: The maximum length varies with accuracy grades. Contact THK for details.
Note 2: If connected rails are not allowed and a greater length than the maximum values above is required, contact THK .
Unit: mmTable Standard Length and Maximum Length of the LM Rail for Model SRS
Model No.
Standard pitch F 30
10
400
15
5
300
20
5
200
15
5
200
20 30 25 40 40
7.5 10 10 15 15
1000 1000 1340 1430 1430
60
20
1800
G
Max length
SRS
7WM
50
80
110
140
170
200
260
290
SRS
9M/N
55
75
95
115
135
155
175
195
275
375
SRS
9WM/WN
50
80
110
140
170
200
260
290
320
SRS
12M/N
70
95
120
145
170
195
220
245
270
320
370
470
570
SRS
12WM/WN
70
110
150
190
230
270
310
390
470
550
SRS
15M/N
70
110
150
190
230
270
310
350
390
430
470
550
670
870
Sta
ndar
dLM
rail
leng
th(L
0)
40 60
15 20
1800 1800
SRS
15WM/WN
110
150
190
230
270
310
430
550
670
790
SRS
20M
220
280
340
460
640
880
1000
SRS
25M
220
280
340
460
640
880
1000
SRS
7M
40
55
70
85
100
115
130
SRS
5WM
50
70
90
110
130
150
170
SRS
5M
40
55
70
100
130
160
Side seal2
Laminated Contact Scraper LaCS3
End seal1
Dedicated C-cap LM rail mounting holes4
QZ Lubricator 5
Grease nipple 6
SRS OPTIONSOptionsFor model SRS, dust-prevention and lubrication accessories areavailable. Make a selection according to the application and theinstallation site.
18
Image
19
zx SealsHighly wear-resistant end seals made of special resinrubber and side seals for increased dust-prevention effectare available.If desiring a dust-prevention accessory, specify it with thecorresponding symbol indicated in table 3.For the supported model numbers for dust-prevention accessoriesand the overall LM block length with a dust-prevention accessoryattached (dimension L), see table 4.
End seal
When foreign matter enters an LM system, it will cause abnormal wear or shorten the service life. It isnecessary to prevent foreign matter from entering the system. Therefore, when possible entrance offoreign matter is predicted, it is important to select an effective sealing device or dust-preventiondevice that meets the working conditions.
Dust Prevention Accessories
End sealUsed in locations exposed todust.
Seals and Scraper1
Side sealUsed in locations where dustmay enter the LM block fromthe side or bottom surface,such as vertical, horizontal andinverted mount.
Side seal
2c ScraperLaminated Contact Scraper LaCS®
For locations with an even more adverse working conditions,the Laminated Contact Scraper LaCS is available.LaCS removes minute foreign matter adhering to the LMrail in multiple stages and prevents it from entering the LMblock with a laminated contact structure (3-layer scraper).
Features●Since the 3 layers of scrapers fully contact the LM rail, LaCS is
highly capable of removing minute foreign matter.●Since it uses oil-impregnated, foam synthetic rubber with a self-
lubricating function, low friction resistance is achieved.
Basic Specifications of LaCS1 Service temperature range of LaCS: -20。C to +80。C2 Resistance of LaCS: indicated in table 2*Note that LaCS is not sold alone.
Table 1 Maximum Seal Resistance Value of Seal SRS … SS
Model No.
5M*5WM*7M7WM9M9N9WM9WN
12M12N
Seal resistance value0.060.080.080.120.200.301.001.000.600.60
Model No.
12WM12WN15M15N15WM15WN20M25M
Seal resistance value1.301.401.001.101.601.601.301.60
Unit: N
Seal resistance valueFor the maximum seal resistance value per LM block when a lubricantis applied on seal SRS … SS, refer to the corresponding valueprovided in table 1.
9M9WM
12M12WM
2.33.33.54.2
Table 2 Resistance of LaCS
Model No. Resistance of LaCS
15M15WM20M25M
5.17.55.27.8
Model No. Resistance of LaCS
Unit: N
Note 1: Each resistance value in the table only consists of that of LaCS, and does notinclude sliding resistances of seals and other accessories.
Note 2: For the maximum service speed of LaCS, contact THK.
*The figure represents the maximumresistance of UU seals, models 5M and5WM only support UU seal option.
20
If any of the LM rail mounting holes of an LM Guide isfilled with cutting chips or foreign matter, they may enterthe LM block structure. Entrance of such foreign mattercan be prevented by covering each LM rail mounting holewith the dedicated cap so that the top of the mountingholes are on the same level as the LM rail top face.The dedicated C-cap forLM rail mounting holes ishighly durable since ituses a special syntheticresin with high oilresistance and high wearresistance.When placing an order,specify the desired captype with thecorresponding capnumber indicated in thetable.
Model No.C-cap
model No.Bolt used
Major dimensions mm
D H
9WM
12M
15M
20M
25M
C3 M3 6.3 1.2
C3 M3 6.3 1.2
C3 M3 6.3 1.2
C5 M5 9.8 2.4
C6 M6 11.4 2.7
SRS OPTIONSOptions
Table 3 Symbols of Dust Prevention Accessories for Model SRS
Liquid
Large amount of foreign matter
Contact scraperBallBall cage
Structural drawing
v Dedicated C-cap for LM Rail Mounting Holes
LaCSUsed in harsh environmentsexposed to foreign matter suchas fine dust and liquids.
3
4
D
H
Dedicated C-cap It prevents cutting chips from enteringthe LM rail mounting holes.
Symbol
UU
SS
SSHH
Dust prevention accessory
With end seal
With end seal + side seal
With end seal + side seal + LaCS
Model No.
5M5WM7M7WM9M9N9WM9WN
12M12N12WM12WN15M15N15WM15WN20M25M
UU SS SSHH
16.922.123.431.030.840.839.050.734.447.144.559.543.060.855.574.550.077.0
None
15.220.421.028.627.837.836.047.731.444.141.556.540.057.852.571.547.073.0
——
23.431.030.840.839.050.734.447.144.559.543.060.855.574.550.077.0
————
42.452.450.662.346.058.756.171.157.275.069.788.765.292.6
Table 4 Overall LM Block Length (Dimension L) of Model SRS with a Dust PreventionAccessory Attached Unit: mm
Note: "—" indicates not available.
21
Table 1 Parts Symbols for Model SRS with the QZ Lubricator Attached
Symbol
QZUU
QZSS
QZSSHH
Dust prevention accessories for the LM Guide with the QZ Lubricator attached
With end seal + QZ Lubricator
With end seal + side seal + QZ Lubricator
With end seal + side seal + LaCS + QZ Lubricator
Lubrication Accessories
b QZ LubricatorTM
The QZ Lubricator feeds the right amount of lubricant tothe ball raceway on the LM rail. This allows an oil film tocontinuously be formed between the balls and theraceway, and drastically extends the lubrication andmaintenance intervals.When the QZ Lubricator is required, specify the desired type with thecorresponding symbol indicated in table 1.For supported LM Guide model numbers for the QZ Lubricator andoverall LM block length with the QZ Lubricator attached (dimension L),see table 2.
End seal
Flow of lubricant
③ Oil control plate
Ball cage
Ball
Case ② High-density fiber net
① Heavily oil-impregnated fiber net
Features●Supplements lost oil to
drastically extend thelubrication/maintenanceinterval.●Eco-friendly lubrication system
that does not contaminate thesurrounding area since it feedsthe right amount of lubricant tothe ball raceway.●The user can select a type of
lubricant that meets theintended use.
Significant Extensionof the MaintenanceIntervalAttaching the QZ Lubricator helpsextend the maintenance intervalthroughout the whole load rangefrom the light-load area to theheavy-load area.
5 QZ Lubricator
The structure of the QZ Lubricatorconsists of three major components:① a heavy oil-impregnated fiber net
(functions to store lubricant).② a high-density fiber net
(functions to apply lubricant tothe raceway).
③ an oil-control plate(functions to adjust oil flow).The lubricant contained in the QZLubricator is fed by the capillaryphenomenon, which is used alsoin felt pens and many otherproducts, as the fundamentalprinciple.
*Note that the QZ Lubricator is not sold alone.*Those models equipped with the QZ Lubricator cannot have a grease nipple. When desiring both the QZ Lubricator and a grease nipple to be attached, contact THK .
QZUU QZSS QZSSHH
Table 2 Overall LM Block Length (Dimension L) of Model SRS with the QZ LubricatorAttached
Note: "—" indicates not available.
Unit: mm
Model No.
5M
5WM7M7WM9M9N9WM9WN
12M12N12WM12WN15M15N15WM15WN20M25M
——
33.441.040.850.849.060.744.457.154.569.555.072.867.586.566.097.0
——
33.441.040.850.849.060.744.457.154.569.555.072.867.586.566.097.0
————52.462.460.672.356.069.166.181.169.287.081.7
100.981.2
112.6
22
SRS OPTIONSOptions
n Grease Nipple
■When Dust Prevention Accessories UU or SS are Attached
For the incremental dimension of the grease nipple when dust preventionaccessories UU or SS are attached, see the table above.
■When Dust Prevention Accessories SSHH are Attached
When dust prevention accessoriesSSHH are attached, the greasenipple can be mounted in thelocation indicated in the figureon the right. The table belowshows incremental dimensionswith the grease nipple.
Model SRS does not have a grease nipple as standard.For the location for attaching the grease nipple, see thefigure on the right. Installation of a grease nipple and thedrilling of a greasing hole are performed at THK. Whenordering SRS, indicate that the desired model requires agrease nipple or greasing hole (for greasing holedimensions, supported LM Guide model numbers forgrease nipples and incremental dimensions, see the tablebelow).
Grease nipple
LaCS Endplate E
6Grease nipple
E L
End seal End seal
Note: For dimension L, see the corresponding dimension table.
Table of Grease Nipple and Greasing Hole Dimensions
Model No.
5M
5WM
7M
7WM
9M
9WM
12M
12WM
15M
15WM
20M
25M
Grease nipple or greasing hole
φ0.8 drilled hole
φ0.8 drilled hole
φ1.2 drilled hole
φ1.2 drilled hole
φ1.5 drilled hole
φ1.6 drilled hole
φ2.0 drilled hole
φ2.0 drilled hole
PB107
PB107
PB107
PB1021B
E
—
—
—
—
—
—
—
—
4.0(5.0)
4.0(5.0)
3.5(5.0)
4.0(5.5)
Unit: mm
Note: Figures in the parentheses indicate dimensionswithout a seal.
Note 1: The grease nipple is not available for models SRS7M, SRS7WM, SRS9M, SRS9WM, SRS12M and SRS12WM.
They can have a greasing hole.
Note 2: Using a greasing hole other than for greasing may cause damage.
Note 3: If the model is equipped with QZ Lubricator, a greasing hole and a grease nipple cannot be attached. If desiring to
attach a grease nipple to the model equipped with QZ Lubricator, contact THK.
Note: When desiring the mounting location for the grease nippleother than the one indicated in the figure above, contactTHK.
25M
Model No.Incremental dimension
with grease nipple E
4
Nipple type
PB1021B
Unit: mm
Caged Ball LM Guide Model SRS
Precautions on use� Handling
� Disassembling components may cause dust to enter the system or degrade mounting accuracy of parts. Do not disassemble theproduct.
� Tilting an LM block or LM rail may cause them to fall by their own weight.� Dropping or hitting the LM Guide may damage it. Giving an impact to the LM Guide could also cause damage to its function even if
the guide looks intact.� Lubrication
� Thoroughly remove anti-corrosion oil and feed lubricant before using the product.� Do not mix lubricants of different physical properties.� In locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and low/high temperature,
normal lubricants may not be used. Contact THK for details.� When planning to use a special lubricant, contact THK before using it.� When adopting oil lubrication, the lubricant may not be distributed throughout the LM system depending on the mounting orientation
of the system. Contact THK for details.� Lubrication interval varies according to the service conditions. Contact THK for details.
� Precautions on Use� Entrance of foreign matter may cause damage to the ball circulating path or functional loss. Prevent foreign matter, such as dust or
cutting chips, from entering the system.� When planning to use the LM system in an environment where coolant penetrates the LM block, it may cause trouble to product
functions depending on the type of coolant. Contact THK for details.� Do not use the LM system at temperature of 80℃ or higher. When desiring to use the system at temperature of 80℃ or higher,
contact THK in advance.� If foreign matter adheres to the LM system, replenish the lubricant after cleaning the product. For available types of detergent,
contact THK .� When using the LM Guide with an inverted mount, breakage of the endplate due to an accident or the like may cause balls to fall
out and the LM block to come off from the LM rail and fall. In these cases, take preventive measures such as adding a safetymechanism for preventing such falls.
� When using the LM system in locations exposed to constant vibrations or in special environments such as clean rooms, vacuumand low/high temperature, contact THK in advance.
� When removing the LM block from the LM rail and then replacing the block, an LM block mounting/removing jig that facilitates suchinstallation is available. Contact THK for details.
� Storage� When storing the LM Guide, enclose it in a package designated by THK and store it in a horizontal orientation while avoiding high
temperature, low temperature and high humidity.
● “LM GUIDE” and “ ” are registered trademarks of THK CO., LTD.● The photo may differ slightly in appearance from the actual product.● The appearance and specifications of the product are subject to change without notice. Contact THK before placing an order.● Although great care has been taken in the production of this catalog, THK will not take any responsibility for damage resulting from typographical errors or omissions.● For the export of our products or technologies and for the sale for exports, THK in principle complies with the foreign exchange law and the Foreign Exchange
and Foreign Trade Control Law as well as other relevant laws.For export of THK products as single items, contact THK in advance. All rights reserved
HEAD OFFICE 3-11-6, NISHI-GOTANDA, SHINAGAWA-KU, TOKYO 141-8503 JAPAN INTERNATIONAL SALES DEPARTMENT PHONE:+81-3-5434-0351 FAX:+81-3-5434-0353
TAIWANTHK TAIWAN CO.,LTD.
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Phone:+82-2-3468-4351SINGAPORETHK LM SYSTEM Pte. Ltd.
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Phone:+55-11-3767-0100 Fax:+55-11-3767-0101EUROPETHK GmbH
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