WR□□□

Rotary joint

Rotary joint

model WRA66

model WRB8WR□

Rotary joint

model WRA6model WRA2F

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237

WRA□

Rotary joint

Single rotary standard
model

Single rotary standard

25MPa

25MPa

WRA□

Rotary joints are best suited for supplying
hydraulic pressure and air to rotary table ofmachining center on which use of secured
hydraulic hoses or fixed piping is difficult.
Four types are available with 2 to 8 circuits,
and each circuit can be used independently.

2 circuitsWRA2Ball bearing

Rotary shaft
2-M8×1.25 depth 10

P.C.D. 60

AAHousingø16 Rc1/8

P.C.D. 44(Factory-set plug)

Drain port

1.8A-A0Max. 3

Rotary joint

O-ring groove P12(O-ring is not included.)ø73 h8 -0.046

chrome plated and then superfinished to offer superior seal
performance and durability.

22Sliding surface is polished, hard

12Piping port
2-Rc1/40

ø73 h8 -0.046

45

Drain port
Rc1/8

4-M8×1.25 depth 10

P.C.D. 60

Special seal ring

90O-ring

32Polishing
Hard chrome plating
Super-ﬁnish

95

Ball bearing

Sliding surface of seal

(h8 tolerance range)
10WRA
Single rotary standard

51

1425

Piping port
2-Rc1/4

Each piping port is marked with code A or B.

238

WRA□

Rotary joint

Single rotary standard

25MPa

Specifications
Model
Number of circuits

WRA2

WRA4

2 circuits

4 circuits

mm 2Orifice area

WRA6

WRA86 circuits

8 circuits

20.4
General mineral based hydraulic oil (ISO-VG32 equivalent) or air

Fluid used
Max. pressure

25

MPa

Varies depending on fluid pressure (refer to page →246 for details on allowable rotations.)Allowable rotations
Operating temperature

0‒70°
CRc1/4 (body upper surface is Rc1/8)

Piping port size
Mass

3.0kg

5.0

4 circuits

8.9

12.9

6 circuits

WRA48 circuits

WRA6WRA8
22.5

8-M8×1.25
depth 104545

30

P.C.D. 87

AP.C.D. 65
ø16 Rc1/8

P.C.D. 54

Each piping port is marked with code A through D.

1.8
324

22.5

Each piping port is marked with code A through F.

Rotary joint

Drain port
Rc1/8

8-M8×1.25 depth 10

P.C.D. 97(h8 tolerance range)
106-M8×1.25 depth 100
ø110 h8 -0.054

WRASingle rotary standard

13 13 13 13 13 13 13

13 13 13 13 13352460

Drain port
Rc1/8

45

4-M8×1.25 depth 100

ø100 h8 -0.054

Max. 3153

53

3Max. 3

150

22119

50

3

Max. 3116

Drain port
Rc1/8

Piping port
8-Rc1/4

P.C.D. 87

45

Piping port
6-Rc1/4(h8 tolerance range)
10220

ø85 h8 -0.054

P.C.D. 72

90(h8 tolerance range)
10

Piping port
4-Rc1/4

32

12 12 1248

1111

Piping port
6-Rc1/4

0-0.046

Piping port
8-Rc1/4182

ø85 h80-0.054

22ø60 h8A-A

ø1000
ø75 h8 -0.046

A-Aø85A-Aø110

179

1.8

O-ring groove P12(O-ring is not included.)O-ring groove P12(O-ring is not included.)11

ø16 Rc1/8(Factory-set plug)

O-ring groove P12(O-ring is not included.)

1.8

P.C.D. 40

Piping port
4-Rc1/4(Factory-set plug)ø16 Rc1/8(Factory-set plug)

22A

A

90

P.C.D. 72

A

4-M8×1.25 depth 103545

AA

60

P.C.D. 97

6-M8×1.25 depth 1060

Each piping port is marked with code A through H.

● Mounting screws are not included.

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WRA□ FRotary joint

Single rotary with flange
model

Single rotary with flange

25MPa

25MPa

WRA□F

Single rotary with flange is a compact
type rotary joint with mounting sectionof the body shaped in the form of flange
to keep the overall height low. Four types
are available with 2 to 8 circuits, and eachcircuit can be used independently.
Fluid should be supplied from flange sideof the body with manifold piping.

2 circuits

WRA2FBall bearing

90°

A

Rotary shaft

P.C.D.72

45°

4-M8 depth 10B

Ball bearing

Housing

3WRA
Single rotary with ﬂange

1878

1122

Rotary joint

ø 90
Piping port
2-Rc1/4

ø 5.10ø 44 h8 -0.039

Sliding surface of seal

ø 10.2O-ring P7(NBR hardnessHs90)

ø 130

Polishing
Hard chrome plating
Super-ﬁnish

4-ø9(mounting screw hole)

Sliding surface is polished, hard
chrome plated and then superfinished to offer superior seal
performance and durability.

O-ringSpecial seal ringAB

P.C.D.62
P.C.D.110

Each piping port is marked with code A or B.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

240

WRA□ FRotary joint

Single rotary with flange

25MPaSpecifications
Model
Number of circuits

WRA2F

WRA4F

2 circuits

4 circuits

mm 2

Orifice area

WRA6F

WRA8F

6 circuits

8 circuits

20.4
General mineral based hydraulic oil (ISO-VG32 equivalent) or air

Fluid used
Max. pressure

25

MPa

Varies depending on fluid pressure (refer to page →246 for details on allowable rotations.)

Allowable rotations
Operating temperature

0‒70°
C

Rc1/4 (body lower surface is manifold piping)

Piping port size
Mass

4.9kg

6.1

4 circuits

10.9

14.9

6 circuits

WRA4F8 circuits

WRA6F

WRA8F
22.5°
45°

30°

6-M8 depth 108-M8 depth 1045°

60°°
60
CA
D

C

D

H

F

A
E

G

E

F

P.C.D.72

90°

B

A

B
C

B

P.C.D.97

4-M8 depth 10

P.C.D.87

45°

D

14168

Rotary joint

14ø10.2

O-ring P7(NBR hardness Hs90)

ø 5.10ø58 h8 -0.046

ø 10.2

183

O-ring P7(NBR hardness Hs90)

ø145

ø 130

ø 155
4-ø9(mounting screw hole)60°

4-ø9(mounting screw hole)45°

4-ø9(mounting screw hole)FDø5.1 O-ring P7
ø10.2 (NBR hardness Hs90)

0ø 69 h8 -0.046

EWRA
Single rotary with ﬂange

ø 5.10ø 44 h8 -0.039

3

3

18

18102

139

112290
Piping port
4-Rc1/425

ø 105
Piping port
6-Rc1/425

ø 115
Piping port
8-Rc1/4

G

H

F
CP.
CA

A.D.7

A

7

P.C.D.125

P.C.D.110

Each piping port is marked with code A through D.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

EB

CP.C.D.62.8 7DB

BP.C .D

Each piping port is marked with code A through F.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

CD

P.C.D.135

Each piping port is marked with code A through H.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

● Mounting screws are not included.

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WRA□□

Rotary joint

Double rotary with flange

Double rotary with flange
model

25MPa

25MPa

WRA□□

Double rotary type combines tworotaries on same axis to keep theoverall height lower still. Two types
are available with 12 or 16 circuits,
and each circuit can be used independently.
Rotary 1 and Rotary 2 rotate independently but they can be synchronized
by using a joint pin (included).

Joint pin(included)

Ball bearing

Rotary 1

Rotary 2

WRA
Double rotary with ﬂange

Rotary joint

Base

Sliding surface of seal
Polishing
Hard chrome plating
Super-ﬁnish

Ball bearing

Sliding surface is polished, hardchrome plated and then superfinished to offer superior seal
O-ring

242

Special seal ring

performance and durability.

WRA□□

Rotary joint

Double rotary with flange

25MPaSpecifications
WRA66

Model

WRA88

12 circuits

Number of circuits
mm 2

Orifice areaA‒F port：8.6

16 circuits

G‒L port：20.4

A‒H port：8.6

I‒P port：20.4

General mineral based hydraulic oil (ISO-VG32 equivalent) or air

Fluid used
Max. pressure

25MPa

Varies depending on fluid pressure (refer to page →246 for details on allowable rotations.)

Allowable rotations
Operating temperature

0‒70°CRc1/4

Piping port size
Mass22kg30

12 circuits

16 circuits

WRA88

WRA66

22.5°

30°

2-joint pin(included)°
60

6-joint pin hole(rotary 2)

6-M8 depth 10 (rotary 1)
8-joint pin hole (rotary 2)

°
45°
45D

B

6-M8 depth 10(rotary 1)

C

Piping port
6-Rc1/4

Piping port
8-Rc1/4

Rc1/8(Factory-set plug)

G

ø 145

B

1461

AJBA

ø 205
Piping port
Rc1/4
4-ø14(mounting screw hole)L

Piping port
Rc1/4

45° 11.25°°
22.5NIK

13 13 1313 13 13 1330.50

ø 68 h8 - 0.046

ø19530°M

H4-ø14(mounting screw hole)

LKO
G

Rotary joint

57

P

WRA
Double rotary with ﬂange

0N
O

5

2230.5

L

M

22JK

L

174.5

13 13 13 13 13I

ø58 h8 -0.046

JK

52.5

H

Piping port
8-Rc1/4

I

5

14

Piping port
6-Rc1/4

G

Manifold piping
O-ring groove P16(O-ring is not included.)25

Manifold piping
O-ring groove P16(O-ring is not included.)

45°

Details of A

Details of A

204.5

ø135

52.5

1.8

Details of B

Details of B2-joint pin(included)

P.C.D.128
1.8

ø20P.C.D.118

Rc1/8(Factory-set plug)

FHEF

ø 20EA

DA

2560°

CB

JPIA

HA
B

FC

DE

B

GCF
DE

P.C.D.100

P.C.D.130

P.C.D.165

P.C.D.175

Each piping port is marked with code A through L.

Each piping port is marked with code A through P.

● Mounting screws are not included.

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243

WRB□

Rotary joint

Single rotary with flange
model

Single rotary with flange

7MPa

7MPa

WRB□

Rotary joint model WRB was developed for low pressure
applications. Aluminum is adopted as body material toreduce the weight. This is a center through type, which
the through bore of rotary shaft can be used for coolant
piping.
Single rotary with flange is a compact type rotary joint
with mounting section of the body shaped in the formof flange to keep the overall height low. Four types areavailable with 2 to 8 circuits, and each circuit can be usedindependently. Fluid should be supplied from flange sideof the body with manifold piping.

2 circuits

WRB2

Ball bearingBA

Rotary shaft

A

P.C.D. 97

A

P.C.D. 72

2-M8 depth 10

Rc1/8(Factory-set plug)ø16

Housing
1.8

O-ring groove P12(O-ring is not included.)Ball bearing

ø14.5 (through hole)

2.5

Rc 3/8A-A0

Max. 383(h8 tolerancerange)
24
18
12.5

Rotary joint

Hydraulic port
2-Rc1/4
ø115 h8 -0.054

ø14.5 (through hole)

2-Rc3/8
ø155

Sliding surface of seal4-ø9(mountingscrew hole)

Polishing
Hard chrome plating
Super-ﬁnish

Sliding surface is polished, hardchrome plated and then super-P.C.D. 90

Bfinished to offer superior seal
performance and durability.

AB

O-ringP.C.D. 135

WRB
Single rotary with ﬂange0ø72 h8 -0.046

BSpecial seal ring45ﾟ

ø11.2
ø6O-ring P8(NBR hardnessHs90)

B-B

Each piping port is marked with code A or B.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

244

WRB□

Rotary joint

Single rotary with flange

7MPaSpecifications
WRB2

WRB4

2 circuits＋1 circuit

4 circuits＋1 circuit

Model
Number of circuits
mm 2

Orifice areaWRB6WRB8

6 circuits＋1 circuit

8 circuits＋1 circuit

28.3
General mineral based hydraulic oil (ISO-VG32 equivalent) or air (center through circuit: coolant)

Fluid used
Max. pressure

7MPa

Varies depending on fluid pressure (refer to page →246 for details on allowable rotations.)

Allowable rotations
Operating temperature

0‒70°
C

Body lower surface is manifold piping, upper surface is Rc1/8, side surface is Rc1/4, center through is Rc3/8

Piping port size
Mass

4.5

kg

5.5

6.5

7.5：＋1 circuit indicates a center through circuit (coolant).

4 circuits

6 circuits

WRB48 circuits

WRB6WRB88-M8 depth 10CBAE

D0ﾟ

6

ø1618

ø14.5 (through hole)

2.52-Rc3/80

ø72 h8 - 0.046

ø155

ø155

0

ø72 h8 - 0.046
ø155
4-ø9(mountingscrew hole)4-ø9(mountingscrew hole)4-ø9(mountingscrew hole)

GE

B

ø11.2
ø6O-ring P8(NBRhardness Hs90)

B-B

Each piping port is marked with code A through D.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

60

ﾟ

ø11.2

C22.5 ﾟO-ring P8(NBRhardness Hs90)

ø11.2
ø6

ø6B-B

Each piping port is marked with code A through F.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

P.C.D.135

DB
B

B

45ﾟ

E
A
B

C

B

P.C.D.90

P.C.D.135

DA

ﾟ

B
B B

F

H

P.C.D.90

P.C.D.90
A

P.C.D.135

F45

C

WRB
Single rotary with ﬂange

2-Rc3/80

ø72 h8 - 0.046

DRotary joint

173

0ø115 h8 -0.054(h8 tolerance range) 24
12.5

143

ø14.5 (through hole)

182.5

2.5

2-Rc3/8

A-A

Max. 31.80

ø115 h8 -0.054(h8 tolerance range) 24

12.5

ø14.5 (through hole)

Hydraulic port
8-Rc1/4

12.5

Max. 3(h8 tolerance range)
24

A-A

Max. 3

1.8

A-A0

ø115 h8 -0.054

18113

Hydraulic port
6-Rc1/4

1.8

O-ring groove P12(O-ring is not included.)O-ring groove P12(O-ring is not included.)Hydraulic port
4-Rc1/4

Rc1/8(Factory-set plug)
ø16

ø16
O-ring groove P12(O-ring is not included.)ﾟ22.5 ﾟRc1/8
(Factory-set plug)

30ﾟRc1/8(Factory-set plug)45

ﾟFGF45ﾟ

H45

DAEA

ﾟ

CAA

A60

A

P.C.D. 97

P.C.D. 72

A

P.C.D. 97

P.C.D. 72

BA

P.C.D. 72

C

P.C.D. 97

D

6-M8 depth 10
B

4-M8 depth 10

O-ring P8(NBRhardness Hs90)

B-B

Each piping port is marked with code A through H.
The mounting surface finish must be no rougher
than Rz6.3 (ISO4287:1997).

● Mounting screws are not included.

To download CAD data / To get updated information, visit www.pascaleng.co.jp245WR□□□Rotary joint

Rotating torque (reference)
1515250
WRA6WRA88200

WRB6WRB4WRB2

5

10

Rotating torque (N･m)

10Rotating torque (N･m)

Rotating torque (N･m)

WRB8

5150
WRA66

100

WRA4WRA250
WRA8001234560

70

5

Fluid pressure (MPa)101520025

05

Fluid pressure (MPa)

1. Diagram above depicts torque (sliding resistance ofpacking) for stable rotation.

10152025

Fluid pressure (MPa)

3. There is variance of torque with each product.
4. Rotating torque values indicated above are reference

2. Starting torque may become twice as much as torquevalues.

during stable rotation.

Allowable rotations

300
Rotary joint

400
WRA2WRA4

WRB8WRB6300

200

Allowable rotations (rpm)Allowable rotations (rpm)

WR□

WRB4
WRB2

100

WRA6

WRA8200

100
WRA66

WRA88
00

1234

567

Fluid pressure (MPa)
1. Diagram above depicts allowable rotation when proper
lubrication oil film has been formed.

0035101525

2. Simultaneous use of maximum values is not possible,
since used fluid pressure, rotating speed and operatingtemperature mutually affect each other.

246

20

Fluid pressure (MPa)WR□□□

Rotary joint

Caution in use

4. At installation, fixate the rotating side. For the stationary

1. Fluid applied is limited to general mineral based hydraulicside, only the rotational restraint should be provided tooil or air. Contact us concerning other fluid.

avoid an eccentric overload. (Refer to diagram below.)
2. When applying hydraulic oil to rotary joint, oil film leak5. Flexible hose must be used for piping when installation.

age to adjacent circuits is inevitable. When the oil and air

Do not use the steel tube.

circuits are being allocated in one rotary joint, be sure toallocate a circuit between them as a drain circuit. (If the air
circuit can tolerate the oil leakage, drain circuit is not man-

6. When using mineral hydraulic oil, drain port should havedatory.)

an independent piping to return the oil directly to tank.

3. Non-stop operation should be avoided, as heat from packingʼs sliding resistance is generated.

Mounting screw (rotating side ﬁxing screw)

Clamp

Clamp

Rotary tableRotation positioning bracket

Rotary joint

RotaryjointWR□

Flexible hose

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247