PICO RODLESS ⅡPRM2PICO RODLESSⅡ

PRM2 Series

PICO RODLESSⅡR

PICO RODLESS ⅡPRM2INDEX★
Overview ････････････････････････････････････････････584
Explanation, Example of Use, Installation Method ･･･585
Model Code No. ･････････････････････････････････････586
Speciﬁcations, Guide to be used, Theoretical Thrust ･･･587
Spare Parts Code ･･･････････････････････････････････588
Product Mass, Modiﬁcation of Port Position ････････589
Structure and Principal Components ････････････････590
Direction of Centralized Piping and Port ･････････････591

Main Body and Load Bolt Mounting ･････････････････592
Notes on Maintenance and Disassembling ･･････････593

Note for Safe Use ･････････････････････････････594, 595
Accuracy and Datum Plane ･････････････････････････596
Theoretical Deﬂection of Guide Table by Moment ････････597
Allowable Mounted Load Mass, Load and Moment･･598〜601
Dimensions ･･･････････････････････････････････602〜605
Switch Installation, Custom Made ･････････････606, 607

583

PICO RODLESSⅡ
PRM2 Series

ＰRM2High Rigidity Linear Guide ＋ Rodless Cylinder
Small Size, Lightweight and Compact

Linear Guide
PICO RODLESS ⅡHigh Accuracy, High Rigidity
Linear Guide is built-in.
THK CO., LTD SRS

Stopper for Stroke Adjustment
Selectable between shock absorberand rubber stopper.

Linear Guide Table
High-accuracy, high-rigidity linear guideof circulating inﬁnite linear motion type.

Linear Guide Rail
Guide rail is directly used for mounting
the body. High accuracy andhigh rigidity of linear guideare realized.

Countermeasure for Copper Parts
Copper parts are not used.

（）

Only blank plug and Shock absorber for PRM2-φ8
Copper on body + electroless nickel plating

Centralized Piping
One-side concentrated piping ispossible. (Optional)
The direction of the centralized
piping is selectable.

Piping Port
Possible in the axial and lateral
directions.

Datum Plane
A recess is provided in the end
plates on both sizes, which allows
positioning by pressing on thedatum plane of the rail.

584

PRM2

PICO RODLESSⅡ

Summary of the Pico Rodless Ⅱ PRM2 Series

PRM2

The series of high-accuracy guided rodless cylinders pursues utmost size and weight reduction andcompactness. The overall length has been signiﬁcantly reduced by providing a connecting magnet in the
body and piston. Aluminum alloy is employed for the body and there is no extra base on the bottom sideof the linear guide, which has made it possible to realize a signiﬁcant weight reduction and restrain theheight. For mounting, the linear guide rail can be directly used, which allows the high accuracy, highrigidity and high mounting accuracy of the linear guide to be fully brought out. The stroke can be
adjusted by either of the two methods: shock absorber and rubber stopper. One-side concentrated piping
is also possible. Model with the threaded holes in the table top side for mounting a load that areprovided with helical inserts is also available made to order.

PICO RODLESS Ⅱ■Application Examples : PICO RODLESSⅡ

Chuck Movement■MAIN BODY INSTALLATION(Bolt as shown in the ﬁgure are not suppliedwith products)

Opening and Closing of the Door■MOUNTING(Bolt as shown in the ﬁgure are not suppliedwith products)

585

Custom Made
Grease Converted ProductCustom MadeThin Rodlessφ16,φ25,φ32

Block Type RodlessWith Helical Insert

PRD Series

PRZ Series

607 Page

607 Page

611 Page

397 Page

Model Code Example

PICO RODLESS Ⅱ

ＰRM2

PRM2S-SD12-100-QZ-RS-RB12LA●Series Name

●Bore Size
8

φ8

12

φ12

Cable Length●

Magnet and Switch Rail●No CodeNone

Ｓ

Magnet and Switch Rail

1ｍ

LA

3ｍ

●Number of Switches

A magnet and switch rail isrequired when mounting switches.

1

1

2

2

3

3

Switch●No CodeCentralized Piping●SD

No Code

None

None

RB1

Straight

RC1

Angle

RB2

Straight

RC2

Angle

RB4

Straight

RC4

Angle

RB5

Straight

RC5

Angle

DC12〜24V

2 Wires
Reed Rwitch

DC12〜24V

2 Wires
Reed Rwitch

DC12〜24V 2 Wires Solid
State Switch
DC5〜24V 3 Wires Solid
State Switch

Direction Of Cable Outlet
RB････Straight Outlet Cable

RC････Angle Outlet Cable

For details

SL

With
Indicator
Light
Without
Indicator
Light
With
Indicator
Light
With
Indicator
Light

Centralized Piping Port

Left

Page 1066, 1067

●Installation Positions of Magnet and Switch Rail

Switch Rail
（Option: No Code）

No Code

Guide Side Mounting

RS

Cylinder Side MountingPort

For details
Page 587
For models with centralized piping, the indication of the mounting position of
the magnet switch rail (PRM2S) is always no symbol (mounted on the guide side).

●Stopper Type
Port

SR

Rail for Centralized Piping

Centralized Piping Port

QZ

Both Sides Shock Absorber

Shock Absorberwith Metal Stopper

Right

QT

Both Sides Rubber Stopper

Rubber Stopper

Switch Rail
（Option: No Code）
Port

For details
Rail for Centralized Piping

For details

Model
PRM2
PRM2S

586

Port

Bore Size

Page 591

Magnet, Switch RailCentralized Piping

None
Guide Side Mounting（Option Code：None）
Cylinder Side Mounting（Option Code：RS）

Page 587●Stroke×Standard Stroke
（mm）
50

100

150

200

φ12
φ16
Intermediate Stroke
Please adjust with Stopper (Shock Absorber)

250

300

PRM2

PICO RODLESSⅡSPECIFICATIONSBore Size

φ8㎜

φ12㎜

Magnet Holding Force

35N

79N

Maximum With Shock Absorber
Load Mass With Rubber Stopper

2kg

3kg

1kg

1.5kg
M5×0.8Precision Linear Ball Bearing

Type of Operation

Double Acting

Fluid

Air

Maximum Operating Pressure

0.65MPa

Minimum Operating Pressure

0.32MPa

Pressure

PRM2

Port Size
Guide Mechanism

0.25MPa

Operating Temperature

5〜60℃

Maximum Operating Speed

500㎜/sMinimum Operating Speed

190㎜/sPICO RODLESS Ⅱ

0.9MPa190㎜/sShock Absorber（with Metal Stopper)

Cushioning

Rubber Stopper
Not required

Lubrication

THE TYPE OF LINEAR GUIDESTROKE ADJUSTMENT RANGE

Type

Model
PRM2−φ8

THK SRS 9MUUC1

PRM2−φ12

THK SRS 12MSSC1

Model

Rubber Stopper

QZ

QT

Each −19 mm on one side (total −22 mm) Each −19 mm on one side (total −22 mm)

PRM2−φ8Pre-load:Zero or slightly pre-loaded

Shock Absorber

Each ＋0.9 mm on one side (total ＋1.8 mm) Each ＋0.9 mm on one side (total ＋1.8 mm)

PRM2−φ12

Each −21 mm on one side (total −42 mm) Each −21 mm on one side (total −42 mm)
Each ＋0.9 mm on one side (total ＋1.8 mm) Each ＋0.9 mm on one side (total ＋1.8 mm)

THEORETICAL THRUST

Unit：Ｎ

Operating Pressure MPa

Bore Size
（㎜）

0.3

φ8
φ12

34

0.4

0.5

0.6

0.65

20

25

30

33

45

57

68

When used vertically, the PRM2-φ8 from the theoretical thrust please pull 10N,
PRM2-φ12 is 35N.

73
1MPa＝10.2kgf/cm2
1N＝0.102kgf

INSTALLATION POSITIONS OF MAGNET AND SWITCH RAILNo CodeSwitch Rail

Guide SideRS

Cylinder Side

Guide

Switch Rail

CylinderFor models with centralized piping, the indication of the mounting positionof the magnet switch rail (PRM2S) is always no symbol(mounted on the guide side).

587

OPTIONAL PARTS CODES
Name

Switch Fixture

Reed Switch（2 Wires, with Indicator Light）
Straight Outlet Cable Angle Outlet Cable

Reed Switch（2 Wires, without Indicator Light）
Straight Outlet Cable Angle Outlet Cable

PARTS CODE

BF（PRM）

RB1
（PRM）

RC1
（PRM）

RB2
（PRM）

RC2
（PRM）

Note

Screw, Nut

Cable Length:1mCable Length:1mCable Length:1mCable Length:1m

ＰRM2

PARTS CODE

RB1LA
（PRM）

RC1LA
（PRM）

RB2LA
（PRM）

ＲＣ2ＬＡ
（PRM）

Note

Cable Length:3mCable Length:3mCable Length:3mCable Length:3mwith ﬁxture

with ﬁxture

with ﬁxture

with ﬁxture

PICO RODLESS Ⅱ

Content

Solid State Switch（2 Wires, with Indicator Light）

ShieldShock Absorber

Straight Outlet Cable Angle Outlet Cable

Solid State Switch（3 Wires, with Indicator Light）
Straight Outlet Cable Angle Outlet Cable

MS（PRM□）

RB4
（PRM）

RC4
（PRM）

RB5
（PRM）

RC5
（PRM）

Fill in □ as bore size
Before mounting, apply
anaerodic adhesive tothe screws.

Cable Length:1mCable Length:1mCable Length:1mCable Length:1m

RB4LA
（PRM）

RC4LA
（PRM）

RB5LA
（PRM）

RC5LA
（PRM）

Cable Length:3mCable Length:3mCable Length:3mCable Length:3mwith mounting screws

with ﬁxture

with ﬁxture

with ﬁxture

with ﬁxture

Adjuster Bolt with Rubber Lock Nut

ABK8

AG（M8−32）

NTS
（M8）

For φ8（M8×0.75）

For φ8（M8×0.75）

For φ8（M8×0.75）

ABK10

ＡG（M10−50）

NTS
（M10）

For φ12（M10×1）

For φ12（M10×1）For φ12（M10×1）

MagnetRK（PRM）

Switch Rail
RJ
（PRM

−

）

Before mounting, apply
anaerodic adhesive tothe screws.

Specify the bore size for , stroke for andmagnet switch rail mounting position for .

with mounting screws

with ﬁxing bolts

Example) The Rail for PRMS-SD12-100-QZRS
is RJ (PRM12-100RS).

Common to shock
absorber and adjustment
bolt with rubber.

with nutwith nut

Repair Parts Kit

Cylinder Repair Grease

HP（PRM□）

HG（PRM8）

BS−M5

BR−M5

Fill in □ as bore size

For φ8with gasket

Coat BR-M5 with sealtapes or sealingliquid when using it.

HG（PRM12）
For φ12For details
Page 590

With Cylinder Repair Grease

588

Grease exclusively
for the cylinder.
The grease is
diﬀerent from thatfor the guide. Do
not use this grease
for the guide.

Centralized Piping Rail

Plug

PC
（PRM

−

）

Specify the bore size forandstroke for .
Example) The Centralized Piping for
PRMS-SL12-100-QZ is RJ (PRM12-100RS).
For details

page 591with ﬁxture

PRM2

PICO RODLESSⅡ

Product MASS
●Mass of PRM2
Model

Unit：gStroke (mm)
50

100

150

200

250

300

PRM2−φ8

240

260

280

300

320

340

PRM2−φ12

470

510

550

590

630

670

PRM2

Note: with shock absorber, rubber stopper are both the same mass.

●Additional Mass of Centralized Piping
50

100

150

200

250

300

PRM2−φ8

40

50

60

70

80

90

PRM2−φ12

45

55

65

75

85

95

PICO RODLESS Ⅱ

Model

Unit：gStroke (mm)Note: SL, SR are both the same mass.

●Additional Mass of Magnet, Switch Rail
Model

Unit：gStroke (mm)
50

100

150

200

250

PRM2−φ8

45

60

75

90

105

300
120

PRM2−φ12

55

70

85

100

115

130

NOTE: No code, RS both the same mass of the magnet switch rail mounting position.

●Mass of Switch
Type
RB1, RB2, RB4, RB5
RC1, RC2, RC4, RC5
RB1LA, RB2LA, RB4LA, RB5LA
RC1LA, RC2LA, RC4LA, RC5LA

Unit：gMass

METHOD TO CALCULATE THE MASS
Ex. PRM2S−SR8−100−QZ−RS−RB42LA
Basic Mass･･･････････････････････････ 260g
Centralized Piping（SR）･･･････････････････ 50g
Magnet, Switch Rail･････････････････････ 60g
Switch･･･････････････････････････ 35×2＝70g

15
35

260＋50＋60＋70＝440g

Modiﬁcation of Port Position■Port
The position can be selected from two points for each of the plates on both ends.
Change the port position by the placement of the blank plug (BS-M5).
When the magnet switch rail mounting position is on the cylinder side, only the axial direction isavailable for the port.
Blank Plug BR-M5 if Projection is not allowed
page 588
Port Change for Centralized Piping Typepage 591

589

STRUCTURE AND PRINCIPAL COMPONENTS
１

１７

ＰRM2

１５

１８

２

２０

１６

２１ １９

PICO RODLESS Ⅱ

３

２６ １２ １３ ３３ ２９４

３０ ３２ ９７ ８ １０ １４ ２８ ２４２５ ２７ １１

５

３１

Stopper Type：Both Sides Rubber Stopper

６２３Note: The tube slightly moves in the axial (up to about 1.5 mm)

２１ ２２

＋

and circumferential directions, which is due to the playprovided for preventing galling with the guide and not anabnormality.

PRINCIPAL COMPONENTS
No.

Name

Material

1

Linear Guide Table

Stainless Steel, Resin

RemarksNo.

NameMaterial

14

O-ringNBR

2Linear Guide Rail

Stainless Steel

3

Body

Aluminum AlloyWhite Alumite

4

Rod CoverAluminum Alloy

5

Tube

6

Plate

7

Outer Magnet

8

Remarks

15

Fixing Bolt

Steel

Nickel Plating

16

Fixing Bolt

Steel

Nickel Plating

White Alumite

17

Fixing Screw

Stainless SteelStainless SteelHard Chromium Plated

18

Stopper Catcher

Carbon Steel (Heat Processed)

Electroless Nickel Plating

Aluminum AlloyWhite Alumite

19

Shock Absorber

Steel（For φ8: Copper Alloy）

Electroless Nickel Plating

Rare-earth Magnet

20

Metal Stopper

Steel

Heat Treatment (Nitriding)Inner Magnet

Rare-earth Magnet

21

Lock Nut

SteelElectroless Nickel Plating
Electroless Nickel Plating

9

Outer Yoke

SteelElectroless Nickel Plating

22

Adjuster Bolt (for Rubber)

Steel

10

Inner Yoke

SteelElectroless Nickel Plating

23

Cushion Rubber

Urethane Rubber

11

PistonAluminum AlloyWhite Alumite

24

ShieldSteelElectroless Nickel Plating

12

Rod

Stainless Steel

25

Screw

Steel

Nickel Plating

13

Nut

Steel

26

Cushion Rubber

Urethane Rubber

Nickel Plating

Note: No.24, No.25 is the only case of PRM2S.
Please do not turn the No.17 ﬁxing screw.

REPAIR PARTS（With Grease）
No.

Name

Material

Qty

No.

Name

Material

Qty

27

Piston Seal

NBR

2

31

Packing

NBR

2

28

Wear Ring

Synthetic Resin

2

32

O-ringNBR

229

Dust Seal

NBR

2

33

Circlip

Steel

2

30

Bush

Synthetic Resin

2590

Remarks

Remarks

Nickel Plating

PRM2

PICO RODLESSⅡDIRECTION OF CENTRALIZED PIPING AND PORT■SL（Centralized Piping

Port Left Side）

Switch Rail■SR（Centralized Piping

３８ ３７

３４

３７ ３８

３５

PICO RODLESS Ⅱ

PRM2

３６

３９

Port Right Side）
Switch Rail

３９

３５

３８ ３７

３４

３７ ３８

３６

■Change from SL to SR and Precautions
Plugs A and B have diﬀerent shapes and simply changing the placement of the blank plug (No. 39) cannotchange between SL and SR.
Follow the procedure below to change plug A for plug B.
Plugs A and B are in diﬀerent colors: silver and black respectively.
●Gradually loosen plugs A (No. 35) and B (No. 36) and remove the centralized piping rail (No. 34).
●Attach the gasket (No. 38) and exchange the locations of plugs A and B.
●Remove the blank plug and attach it on the plug A side.
●Insert the seal washer and screw in plugs A and B to secure the centralized piping rail.

Centralized Piping Rail
RemarksNo.

Name

Metarial

Qty

No.

Name

Metarial

Qty

34

Centralized Piping Rail

Aluminum Alloy

1

37

Seal Washer

NBR、Steel

2

35

Plug A

Carbon Steel1

Electroless Nickel Plating 38

GasketNBR、Steel

236

Plug B

Carbon Steel

1

Black Nickel Plating 39

Blank Plug

Copper1

Remarks

Electroless Nickel Plating

The parts on this parts list are grouped into one set as a part separately oﬀered.

591

BODY INSTALLATION
Top Mounting（Plate, Guide Rail Thru Hole used）

Plate

L2

L1

ＰRM2
PICO RODLESS Ⅱ

Guide Rail

Caution●Ensure that the mating mounting surface is a ﬂat surface (recommended ﬂatness: 0.05 mm) and tighten evenly.
●For securing, use all mounting holes of the plates on both sides and the guide rail.
Securing only with either the plates or guide rail or, even if both plates and guide rail are used for securing, failure to use
all mounting holes may lead to damage to the actuator or insuﬃcient rigidity.

Plate Portion Mounting Bolt

Guide Rail Portion Mounting Bolt

Thru Hole Length Fastening Torque
Ｎ・ｍ
L1（㎜）

Model

Bolt Size

PRM2−φ8M3

13

PRM2−φ12M4

15Bolt Size

1.1

PRM2−φ8

M3

2.2

1.1

2.5

PRM2−φ12

M3

3

1.1

MOUNTING ON TABLE
Top Mounting

Fastening
TorqueＮ・ｍ

M4×0.7

Screw
Depth
L（㎜）
7

2.5

Pin Holes for
Positioning
φD×H（mm）
φ3 ＋0.06＋0.012 depth3

M4×0.78

2.5

φ3 ＋0.06＋0.012 depth3

Bolt Size

PRM2−φ8
PRM2−φ12

592

L

H

φD

Model

Thru Hole Length Fastening Torque
Ｎ・ｍ
L2（㎜）

Model

PRM2

PICO RODLESSⅡPRECAUTIONS FOR MAINTENANCE AND DISASSEMBLY
Caution

Structure And Principal Components
Structural Drawing with Centralized Piping
Step

Notes

・Loosen the bolt connecting between the plate and ・Make sure that no pressurized air is in the tube and there is no residual
the linear guide rail.
pressure.
・Remove the plate.
・Ensure that the housing is not scratched.
・Apply a suﬃcient amount of grease. Inadequate application may adversely aﬀect durability.
・For the grease, use the special grease included in the repair parts set.
・The packing needs to be correctly oriented.

・Force the body to be displaced from the piston.

・Do this without pulling the tube out of the body.
・Move to a point where the holding force that connects between the bodyand the piston disappears.
・Pulling the tube out of the body while the holding force remains makes it
impossible to remove because of the magnetism of the magnet.
・Do this without pulling the tube out of the body.
・Do this while the piston is not in the tube.

3・Pull the piston out of the tube.
・Pull the tube out of the body.
・Remove the retaining ring for hole and the rod cover.
・Replace the dust seal, bushing and O-ring.
4・Secure the rod cover with the retaining ring for hole.

・Remove, replace and reattach the rod cover on one side at a time.
Removing both of them at the same time may cause the magnet assembly
to come apart, leading to failure.
・Ensure that the dust seal and bushing housings are not scratched.
・For the grease, use a suﬃcient amount of the special grease included in the repair parts set.
・Dust seals need to be correctly oriented.
・Mount the retaining ring for hole with the side that does not have a shear
droop on the circumference facing outside.

PRM2

・Replace the packing of the plate.
2

PICO RODLESS Ⅱ

1page 590
page 591

・Remove the old piston seals and wear rings.
・Ensure that the piston seal and wear ring housings are not scratched.
・Apply a suﬃcient amount of grease. Inadequate application may adversely aﬀect durability.
・Replace the wear rings.
・Apply・For the grease, use the special grease included in the repair parts set.
greaseontheentiresurfaceofnewpiston5・Apply a suﬃcient amount of grease. Inadequate application may adversely aﬀect durability.
seals and mount the seals.
・Piston seals need to be correctly oriented.
・Apply grease on the outer circumference of the ・Apply new grease after wiping the old grease oﬀ.
・Apply a suﬃcient amount of grease on the entire outer circumferential surface
piston and inner circumference of the cylinder tube.
of the piston. Inadequate application may adversely aﬀect durability.
・Insert the piston into the tube.
・For the grease, use the special grease included in the repair parts set.
6 ・Insert the tube into the plate.
・Ensure that the packing is not scratched.
・Mount the plate on the guide rail and secure with・Apply an anaerobic adhesive on bolts and tighten with the speciﬁed torque.
the bolts.
(See Table below)
・Apply grease on the outer circumferential surface ・For the grease, use the special grease included in the repair parts set.
of the tube.
・If they are displaced, suﬃcient holding force cannot be obtained, which may
cause malfunction.
7 ・Remove the absorber.
・Move the body in the direction of piston displacement ・Moving the body until it touches the plate brings the cushion rubber tocome in contact with the plate and the piston is mounted at the rightto align the body with the piston.
position.
・Mount the absorber.

Notes on Magnetic Products
The piston in the tube and the body contain amagnet with strong magnetism. Bringing it
close to any magnetic recording medium maycause the data to be erased.
Do not bring it close to any device that may
malfunction due to magnetism.

Model

Bolt Size

Fastening Torque

PRM2−φ8

Ｍ3×0.5

1.1N・m

PRM2−φ12

Ｍ4×0.7

2.5N・mBolt
Plate

Linear Guide Rail
Packing
Stopper Catcher

Timing of Replacement of Repair Parts
As a rule, replace at intervals of travel ofabout 800 km.

Magnet Assembly
Do not disassemble the magnet assemblies
in the piston or the body. It may cause failure.
The magnet may be damaged if impact fromdropping, etc. is applied to the piston or thebody.
Cushion Rubber

Absorber

Body

Dust Seal
Tube
Wear Ring

O-ringBush
Rod CoverCirclip
Piston Seal

593

PRECAUTIONS FOR DESIGN AND USE
Caution
Mounting Surface Accuracy

ＰRM2
PICO RODLESS Ⅱ

Rigidity of Mounting (Securing Part)①Ensure that the mating mounting surface of a machine,
equipment, jig, etc. to be mounted on the body top side or
the guide rail bottom side of PICO RODLESS Ⅱ is a ﬂat
surface machined to high precision without unevenness
or projections and mounting is correct in order to achieve
stable, high-accuracy linear motion.
Low mounting surface accuracy or incorrect mounting
may cause looseness, increase the rolling resistance oradversely aﬀect the service life.
Mounting Datum Plane of Body and Table

page 596②It is recommended to provide a recess in the cornerof a mating mounting surface of the body and theguide rail but a curve as shown in the ﬁgure below
can be made for use.
A larger corner proﬁle than the chamfer dimensionof the body or guide table may cause inaccuratecontact with the abutting surface.

A

B

Corner Proﬁler2

Unit：㎜Model

r1

PRM2−φ8

B

Maximum Operating Pressure
The piston subjected to air pressure and the body on
which to mount the load are connected together bymagnetism of the magnet of the piston. Accordingly,
operation at a pressure exceeding the maximum
operating pressure 0.65MPa may disengage theconnection and allows the body to move freely, which
renders the unit uncontrollable. Ensure that the pressure
does not exceed the maximum operating pressure.

Intermediate Stop
Avoid any intermediate stop in a pneumatic circuit
using a closed center valve, etc. Forced stop of thepiston alone may disengage the magnetic connection
between the body and the piston because of theinertial force of the body and the mounted load, which
renders the unit uncontrollable. Likewise, do not switch
operation in the middle of a stroke.

r1

A

Insuﬃcient rigidity of the securing method andmounting of the product may hinder realization of thehigh rigidity and high accuracy of PICO RODLESS II.
When designing, give suﬃcient consideration to therigidity of equipment such as the mounting base.

r2

R0.2 or less R0.1 or less

PRM2−φ12 R0.2 or less R0.3 or less③Ensure that there is no squareness error between
the body or guide rail mounting surface and theabutting surface.
Inadequate squareness may cause inaccuratecontact with the abutting surface.

Connection with Load
For connection with any load that has an external
supporting mechanism, ensure suﬃcient centering.
Direct loading within the allowable range for operation ispossible but insuﬃcient centering of connection withload that has an external supporting mechanism may
adversely aﬀect operation, service life, etc. A longer
stroke means a larger displacement of the axis. Consider
a method of connection that tolerates the displacement.

θ

Load Center of Gravity
θ

A

B

H1

④When designing the abutting surface, pay attention
to the height and thickness of the abutting surface.
Inadequate thickness may lead to poor accuracy
due to insuﬃcient rigidity against transverse load or
positioning with a lateral pressing bolt.

H2

A

B

594

Recommended Dimensionsof Abutting Surface

Unit：㎜

PRZ12

H1

H2

PRM2−φ82

0.5

PRM2−φ122

1.5※Please note the interference of the plate.

Bring the load center of gravity as close to the table
center as possible.
The load center of gravity distant from the body
center may generate a large moment of force,
adversely aﬀecting the service life and rigidity.
Ensure that the load and the moment are within theallowable ranges for operation.

Stroke Adjustment
Adjust the stopper so that the body does not touch
the plate.
Removal of the stopper or inappropriate stopper
adjustment may cause the body to come in contact
with the plate on both ends, leading to failure.
Pay particular attention when adjusting the stroke tothe positive side.

PRM2

PICO RODLESSⅡ

PRM2Lubrication of Tube Outer Circumferential Surface
Apply the special grease on the tube outercircumferential surface at regular intervals (about
300 km).
Shortage of grease may adversely aﬀect durability.
Use the special grease HG (PRM8) or HG (PRM12)
separately oﬀered.
Use of anything other than the special grease may
cause malfunction.
Note that HG (PRM8) and HG (PRM12) are greases
exclusively for the cylinder and diﬀerent from thosefor the guide.
Note that HG (PRM8) and HG (PRM12) are diﬀerent
types of grease.

Linear guide of rust
For the linear guide table and rail, martensitic
stainless steel is used for rustprooﬁng and highrigidity as a linear guide. However, slight rustdevelopment may occur on the outside depending on
the handling conditions (such as touching with thebare hand), operating environment, period of use, etc.

Rolling Feel in Linear Guide
When the product is moved by hand, rolling of balls
inside the linear guide may cause slight feel ofoperation discontinuity or diﬀerence in the rolling
resistance between products. This is due to preloadof the linear guide and does not aﬀect theperformance.

PICO RODLESS Ⅱ

Linear Guide Lubrication
Lubricant is enclosed in the guide table in advancebut the performance will be deteriorated by a long
operating time, operating conditions, environment,
etc. Regular lubrication is necessary.
Using without lubrication may accelerate wear of therolling part or cause earlier end of the service life.
After wiping the old grease oﬀ, apply lithium soap-based
grease through the oil hole in the guide table.
Applying a diﬀerent type of grease may cause
malfunction or failure due to lubrication performancedegradation or chemical change.
Turbine oil can be applied or drop-fed for use. Do notuse spindle oil or machine oil because they adversely
aﬀect the packing.

Projection and Stick-Slip
Magnetic rodless cylinders are subject to slight
projection at the start of operation due to theirstructure.
In the middle of a stroke movement, a slight stick-slip
phenomenon may occur.

Eﬀect of Magnetic ForceThe body and piston integrate a magnet. Do not bringclose to them any product or part that may be
aﬀected by magnetic force.

Lubrication of Compressed Air
The inside of the tube is initially lubricated withspecial grease. Use without regreasing.
When applying grease for repair, etc., use the cylinder
repair grease HG (PRM8) or HG (PRM12) separately
oﬀered.

Play of Tube
The tube slightly moves in the axial (up to about 1.5mm) and circumferential directions, which is due tothe play provided for preventing galling with the guideand not an abnormality.

595

ACCURACY AND DATUM PLANE

Ｄ

PICO RODLESS Ⅱ

E

ＰRM2

C

A

Datum
plane

F

B

ACCURACY

Unit: mmModel

PRM2−φ8

PRM2−φ12
0.03

Running parallelism of C with respect to A

0.03

Running parallelism of D with respect to B

0.03

0.03

Tolerance of dimension E

±0.12

±0.12

Tolerance of dimension F

0
−0.02

0
−0.02

596

PRM2

PICO RODLESSⅡ

THEORETICAL DEFLECTION OF BODY BY MOMENT
If the body is subjected to external force due to gravity or external force on the mounted load,a slight angular displacement occurs.
The displacement angles of the body according to moments in the respective directions areplotted in the graphs below.

PRM2−φ12
Mr

0.15

Mp
My

0.10

0.05

0

0.5 1 1.5 2 2.5
Bending Moment

N・m

Theoretical Deﬂection Angle [deg]Theoretical Deﬂection Angle [deg]PRM2−φ8

Mr（Rolling）

PICO RODLESS ⅡMy（Yawing）

0.15

PRM2

Mp（Pitching）

Mp
My
Mr

0.10

0.05

0

1

2

3

4 5

Bending Moment

N・m

597

ALLOWABLE MOUNTED LOAD MASS, ALLOWABLE LOAD FORCE AND ALLOWABLE MOMENT
Caution
Before using this unit, check that the applied load is within the allowable load. Using out of allowable limit
may cause bad inﬂuence for movement, accuracy and life. At the worst, the actuators would be broken.
Types of Load Situation of Actuator Situation of Load
OperatingContinuously Acting Allowable Mounted Load Mass, Allowable Mounted Load Moment, Allowable Inertia Mass, Allowable Absorber Collision Energy

External Force

Stopping

Temporarily Acting

Basic Static-load Rating, Allowable Static Moment

Direction of Moment and Guide Center Line and Stopper
The moment directions are classiﬁed into three types in accordance with the mounting conditionof a load to the actuator.
Pitching

YawingRolling

Guide Center

Guide Center
Mp
Pitching

StopperMy
YawingS

Ｗ
Ly

Ｗ

StopperMr
Rollingℓy

ＰRM2
PICO RODLESS Ⅱ

Item to be conﬁrmed

Mounted Load(W)Ｗ

F＝9.8×W

F＝9.8×W

F＝9.8×Wℓpℓp

Z

Stopper
ℓy

Z

Ly

Lr

Lp

Position of Guide, Stopper

Unit: mStopper

Guide

Model

Ｚ

ℓp

ℓy

PRM2−φ80.01660.00710.0090

PRM2−φ120.01970.00770.0120W････････････ Mounted load mass(kg)F･････････････ Gravity applied on load(N)
Lp、Ly、
Lr･････ Distance between guide center line and center of gravity of mounted load(m)p、 y･･･････ Distance between guide center line and center of Stopper bolt(m)Ｓ････････････ Distance between center of gravity of mounted load and stopper bolt(m)■Allowable Mounted Load Mass, Allowable Mounted Load Moment, Allowable Inertia Mass
When the actuator is operated with mounted load, conﬁrm that the following four values are within the allowable range.

①Allowable Load Mass
Model
Allowable
Load Mass

Unit：kg

PRM2−φ8

PRM2−φ12

Shock Absorber (QZ)

2

3

Rubber Stopper (QT)1

1.5

CautionWhen operating in the vertical direction, even if mounted load mass is within the allowable range, there might besome cases the thrust are not enough to move or to get the expected speed depending on supplied air pressure.
Besides, there might be some cases the thrust are not enough to push the rod of the shock absorber to end. In
this case, please arrange the load mass less than 20% of theoretical thrust.
Theoretical thrust
page 587

598

PRM2

PICO RODLESSⅡ②Allowable Mounted load Moment
There is the formula below to calculate three moments by the gravity. Please conﬁrm they arewithin the allowable moments in the table bellow.
(Mounted load moment)＝(Gravity applied on load:F)×(Distance between guide center line and center of gravity of mounted load:L)＝9.8×(Mounted load mass:W)×(Distance between guide center line and center of gravity of mounted load:L)

PRM2(Gravity applied on load: F)＝9.8×(Mounted load mass: W)
Pitching…Mp(N・m)＝9.8×W(kg)×Lp(m)Yawning…My(N・m)＝9.8×W(kg)×Ly(m)Rolling…Mr(N・m)＝9.8×W(kg)×Lr(m)PICO RODLESS Ⅱ

Allowable Mounted Load Moment
Allowable Mounted Load Moment N・m

Model

Mp

My

Mr

PRM2−φ8

0.27

0.33

0.42

PRM2−φ12

0.56

0.56

1.07
1N・m＝0.102ｋｇｆ
・m③Allowable Inertia Mass
When a actuator stops at the end of its stroke, a force is generated due to the inertia of the load.
The value of this force depends on various conditions like the shape of load, mounting ways andoperating pressure. Therefore, it is very diﬃcult to formulate the allowable value.
The graphs below show theoretically relation between "the velocity at the stroke end", "mounted
load mass" and "the distance between the center of the gravity of load and stopper".
These graphs can be used as reference to the allowable values of the load.
S: The distance between the center of the gravity of load and stopper. Please refer to theﬁgures of rolling in the previous page.

PRM2−φ8−QZ（With Shock Absorber） PRM2−φ12−QZ（With Shock Absorber）

400㎜/s
300㎜/s1

200㎜/s

0

0.1

0.2

0.3

0.4

Mounted load mass (kg)

500㎜/s

3

1
0

0.5

200㎜/s2

Distance S（m）

/s
0㎜ s
40 ㎜/
0
50

Mounted load mass (kg)

4

2

0.1

0.2

300㎜/s

0.3

0.4

0.5

Distance S（m）

PRM2−φ8−QT（With Rubber Stoppr） PRM2−φ12−QT（With Rubber Stoppr）
1

500㎜/s0.5

400㎜/s
300㎜/s
200㎜/s

0.1

0.2

0.3

0.4

Distance S（m）

0.5

Mounted load mass (kg)Mounted load mass (kg)2.0
1.5
500㎜/s1.0

400㎜/s
300㎜/s0.5
200㎜/s

0.1

0.2

0.3

0.4

0.5

Distance S（m）

Note: When a metal stopper is used externally for stopping, it may generate extremely large impact force.
As a rule, consider 1/5 to 1/10 of the values in the graph above as the mounted load mass.

599

④Shock Absorber Collision Energy（Only QZ）

Horizontal Use

Vertical Downward Use

Vertical Upward Use

V

Usage
Condition
Example

m
V

m

s
m

V
s

Collision Energy E

E ：Collision energy(J)m：Colliding mass(kg)
V：Collision velocity(m/s)
F ：Cylinder thrust(N)s ：Shock absorber stroke(m)g ：Gravity acceleration(9.8m/S2)

s

PICO RODLESS Ⅱ

ＰRM2The energy that the shock absorber of the stopper must absorb consists of three element:
kinetic energy, energy of cylinder thrust and energy due to gravity.
The collision energy is the total of three.
See the shock absorber speciﬁcations and energy absorption graphs below. Use the productwithin the shock absorber speciﬁcations.

E＝1/2（mV2）＋Fs

E＝1/2（mV2）＋Fs−mgs

E＝1/2（mV2）＋Fs＋mgs

SHOCK ABSORBER SPECIFICATIONS
Model

ABK8

Max Energy Absorption

0.68J

ABK10
3J

Stroke5㎜

10㎜

Energy Absorption Per Minute

22.8J/min

60.8J/min
1m/s

Max. Collision Velocity

45c.p.m. or less

Usage Frequency

60c.p.m. or less−5〜70°C

Operating Temperature Range

4.9N

Piston Rod Return Force
Lock Nut Fastening Torque3.9N・m

7.8N・mApplied Model

PRM2−φ8

PRM2−φ12

MODEL: ABK8／For PRM2−φ8

Energy Absorption Graph
Energy absorption E(J)

5（Stroke）

Oil inlet. Do not turn.

（12）

φ2

φ7

1.3

Ｍ8×0.75

2.9

2

1.5

11
（Across ﬂats）

32

0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.5

1.0

Collision velocity V(m/s)

37

MODEL: ABK10／For PRM2−φ12Ｍ10×1（14.2）

φ3

φ8.8

1.3

Oil inlet. Do not turn.

3.5

3
50
60

600

1.5

13
（Across ﬂats）

Energy Absorption Graph
Energy absorption E(J)

10（Stroke）

3.0
2.5
2.0
1.5
1.0
0.5
0.5
Collision velocity V(m/s)

1.0

PRM2

PICO RODLESSⅡ■Allowable Load and Allowable Moment for External Force (Motionless)In the case that an external force is applied temporarily when the actuator stops at the stroke
end or so, conﬁrm that the following two values are within allowable range.

PRM2①External Force Value (Basic Static Load Rating)②External Moment (Static Moment Rating)Note: The arm length of a moment shall be length from the guide center and the point where an external force isapplied.

between the ball and the ball rolling surface. This deformation will prevent the actuator from smooth operation
when it develops more than the allowable limit. The basic static load rating C0, the static moment rating Mp0,
My0 and Mr0 mean such a static load and static moment of constant direction and the total of the permanent
deformation values at the ball rolling surface is 0.0001 times of the ball diameter on the contact surface
receiving the maximum stress.
The static moment applied to the table is limited under C0, Mp0, My0 and Mr0 with corsidering about static safty
factor, fs.

C0≧fs・P

PICO RODLESS Ⅱ

If a guide table receives an excessive load or a large impact, permanent deformation is locally generated

M p 0 、M y 0 、M r 0：Static moment rating N･m
M p 1 、M y 1 、M r 1：Static moment N･m
fs：Static safety factor

Co： basic static load rating N Mp0≧fs・Mp1
My0 ≧fs・My1
P ： static load N
fs： static safety factor Mr0 ≧fs・Mr1

STATIC SAFETY FACTOR fs
Load Conditions

Lower Limit of fs

Impact with Light Load

1.0〜1.3

Impact with Heavy Load

2.0〜3.0

BASIC STATIC LOAD RATING, STATIC MOMENT RATING
Static Moment Rating

N・m

Model

Basic Static Load Rating
N

Mp0

My0

Mr0

PRM2−φ8

231

3.5

4.1

5.3

PRM2−φ12

353

6.0

6.0

11.5
1N・m＝0.102kgf・m
1N＝0.102kgf

601

DIMENSIONS(mm)
ＰＲM2−ＳＤ8−（Stroke）−
No Centralized
Piping

ＰRM2Page 586

Dimension of Shock Absorber

QZ
QT
Stopper
QZ：Both Side Shock Absorber
QT：Both Side Rubber Stopper
Stroke Adjustment Range・・・Single Side−11㎜（Total−22㎜）
Single Side＋0.9㎜（Total＋1.8㎜）

Bore Size
Standard Stroke

PRM2−φ8

Page 600

φ6counterbore
depth3.3（Back Side）
φ3.5thru

25

6.1

6.1

PRＭ2−ＳD8PICO RODLESS Ⅱ

25＋Stroke29

5

2−Ｍ3×0.5depth6

5（For Switch Rail）

4−φ6.5counterbore
depth5
φ3.5thru

20 ±0.12
4−Ｍ4×0.7depth7
Stroke18

475＋Stroke

19.5(Max13)

83＋Stroke

15.5

3.5

11.5

φ9

2

11.5

22.5

9

20

9

)

.3

0

(C

(C

＋0.06

4

19

47

)
.5
0

2

30

16 15.5＋0.06

φ3＋0.012 depth3

41

27

5.5

43

0.7

15

19 2

3＋0.012 depth3

10.5
5.5

4

(Max13)2−M5（Port）

18.5

2−Ｍ8×0.75

602

5
8

4

2−Ｍ3×0.5depth4（For Switch Rail）

11.5

5
8

1.5

4

11.5

2−Ｍ5（Port）（Plug）

PRM2

PICO RODLESSⅡ

With Magnet, Switch Rail

ＱＺ
− ＲＳ
ＱＴ

With Magnet, Switch Rail

MagnetGuide（No Code）

6
19

8

0.5

For PRM2-φ8, the dimensions and shapeof the switch rail diﬀer between the guideand cylinder sides.Make sure that they
are correct.

Position of Magnet and Switch RailNo Code：Guide Side
RD：Cylinder Side

13

Magnet（RS）

Shieldfor both the（ Provided
no code model and RS ）Centralized Piping

Page 606

Switch Rail（No Code）

Switch Rail（RS）

CylinderBlank Plug

（Only No Code）

Port Left Side

ＰＲＭ2
（Ｓ）
−ＳＬ8ー
（Stroke）−

ＱＺ
ＱＴ

Centralized Piping
Port Left SideThe magnet switch rail mounting
position is on the guide side
(no option code).

MagnetGuide（No Code）

PRM2

2.5

Switch Setting Position

ＰＲＭ2−ＳＬ（ＳＲ）8 PICO RODLESS ⅡＰＲＭ2Ｓ−ＳＤ8ー（Stroke）−

Switch Rail（No Code）

Ｍ5（Port）（Go to the body Right）

4
8

0.5

Ｍ5（Port）（Go to the body Left）

7（Width across ﬂats）

2.9

10

1

11.5

Centralized Piping

3.5

8

8

1

Port Right Side

ＱＺ
ＰＲＭ2
（Ｓ）
−ＳＲ8ー
（Stroke）−
ＱＴ
Centralized Piping
Port Right Side Magnet（No Code）

Guide

The magnet switch rail mounting
position is on the guide side
(no option code).

Switch Rail（No Code）

Ｍ5（Port）（Go to the body Left）

1

7（Width across ﬂats）
8

8

8
2.9

3.5

4

0.5

Ｍ5（Port）（Go to the body Right）

1

10
11.5

603

DIMENSIONS(mm)

PRM2−φ12

ＰＲM2−ＳＤ12−（Stroke）−

ＱＺ
ＱＴ

No Centralized
PipingBore Size
Page 586

Dimension of Shock Absorber

Page 600

φ6counterbore
depth4.5（Back Side）
φ3.5thru

5

25

5.5

5.5

PRＭ2−ＳD12PICO RODLESS Ⅱ

Stroke51

14

4−M3×0.5depth4（For Switch Rail）

4−M4×0.7depth8).5Stroke426

23 17.5

23

4.5

24.5

(Max24)

3.5

φ13

2

15

17.5

26.5
14

28.5

10

12

)

.5

0

(C

(C

0

2

34

55

＋0.06

φ3＋0.012 depth3

46

33

6

20

1.5

＋0.06

26 2

3＋0.012 depth31354−φ8counterbore
depth8
φ4.5thru

25 ±0.12

7.5

14

58

ＰRM2

Standard Stroke

Stopper
QZ：Both Side Shock Absorber
QT：Both Side Rubber Stopper
Stroke Adjustment Range・・・Single Side−21㎜（Total−42㎜）
Single Side＋0.9㎜（Total＋1.8㎜）

93＋Stroke

4.5

102＋Stroke(Max24)

2−M5

604

14

4−M3×0.5depth4（For Switch Rail）

14

2−M10×1

5

15

8

7.5

5

1.5

8

7.5

15

2−Ｍ5（Port）（Plug）

23.5（Port）

PRM2

PICO RODLESSⅡ

With Magnet, Switch RailＰＲＭ2Ｓ−SD12ー（Stroke）
−

ＱＺ
− ＲＳ
ＱＴ
Switch Setting Position

With Magnet, Switch Rail

Magnet

7
19

8

4

Guide

（No Code）

Shieldfor both the（Providedno code model and RS ）Centralized Piping

Magnet（RS）

Switch Rail（No Code）

Switch Rail（RS）

CylinderBlank Plug

（Only No Code）

Port Left Side

PRM2
（S）
−SL12ー（Stroke）−

ＱＺ
ＱＴ

The magnet switch rail mounting
position is on the guide side
(no option code).

Centralized Piping
Port Left Side

MagnetGuide（No Code）

ＰＲＭ2−ＳL（ＳＲ）12PICO RODLESS Ⅱ

19

PRM2

2

Page 606

Position of Magnet and Switch RailNo Code：Guide Side
RD：Cylinder Side

Switch Rail（No Code）

M5（Go to the body Right）

4
2.9

8

0.5

M5

（Go to the body Left）

10

7（Width across ﬂats）
1

15

Centralized Piping

8

1

Port Right Side

ＰＲＭ2
（Ｓ）
−ＳＲ12ー（Stroke）−
Centralized Piping
Port Right Side

3.5

8

ＱＺ
ＱＴ

The magnet switch rail mounting
position is on the guide side
(no option code).

Magnet（No Code）

Guide

Switch Rail（No Code）

M5（Go to the body Left）

3.5
17（Width across ﬂats）
8

8

4

8
2.9

0.5

M5

（Go to the body Right）

1

10
15

605

INSTALLATION OF SWITCH■Switch Setting Position
A

B

PICO RODLESS ⅡＰRM2RB（RC）1, 2 Switch

Unit: mm

On hold
distance（ ）Switch Setting Position

Model

A

B

PRM2−φ8

29.5

53.5

PRM2−φ1239

63

RB（RC）4, 5 Switch

Hysteresis
（c）

6

1

Model

Unit: mm

Switch Setting Position
A

B

PRM2−φ8

31.5

51.5

PRM2−φ1241

61

On hold
distance（ ）Hysteresis
（c）

2.5

1

Explanation of hysteresis and on hold distance.

■Installation of Other F Series Products
Caution20

When installing any F Series product with a switch in the vicinity of PICO RODLESS Ⅱ,
ensure that they are apart by the distances shown below.
This is intended for preventing faulty operation of the switch caused by the leakage
ﬁeld of the magnet inside PICO RODLESS Ⅱ.

20

20■Mounting of Magnetic Bodies
CautionFor preventing faulty operation of the switch, ensure that magnetic bodies on the top
and side of the cylinder are away from the switch rail by the distances shown below.
Avoid any structure in which the top, side and bottom of the switch are enclosed
simultaneously.

7

Magnetic Body (Top)

Magnetic Body (Side)
Magnetic Body
(Bottom)10
Switch Rail606

see Switch Catalogue

PRM2

PICO RODLESSⅡ■Installataion of Switch
Assemble the ﬁxing screw with a nut to the switch.
Insert the switch into the groove.
After setting the position, fasten the screw bya screwdriver.
Fastening torgue of ﬁxing screw must be 0.1 N・m.

Nut

PRM2

Fixing Screw M2.5−4.5

PICO RODLESS Ⅱ

Switch

Costom Made■Threaded Hole with Helical Insert
To each order, we will create a drawing of the product to be delivered based on the reference
drawing shown below. Contact us for how to order, time to delivery and detailed speciﬁcation.
Threaded Hole with Helical Insert・・・・・Model with the threaded holes for mounting a loadin the table top side provided with helical inserts.
Note: It is not possible to add helical inserts to an already purchased product.
Helical Insert Material: Stainless SteelThreaded Hole with Helical Insert

Size of Threaded Hole with Helical Insert
Model

Threaded Hole with Helical Insert

PRM2−φ8

Ｍ4 depth6

PRM2−φ12

Ｍ4 depth8■To Change Grease●Change the grease of bearing part to the other grease.
●There is a case might not be handled depends on kind of grease or request.
●Cylinder part is lithium soap grease or ﬂuorine grease.
●Grease of purchased item can not be exchanged.

Please ask us for more detailed infomation.

607

■M E M O ■608

■M E M O ■609

■M E M O ■610