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 used
independently. 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, hard
chrome 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 ring
45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).

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WRB□

Rotary joint

Single rotary with flange

7MPaSpecifications
WRB2

WRB4

2 circuits＋1 circuit4 circuits＋1 circuit

Model
Number of circuits
mm 2Orifice area

WRB6WRB8

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

4.5kg5.5

6.5

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

4 circuits

6 circuits

WRB48 circuits

WRB6

WRB88-M8 depth 10CB

A

E

D0ﾟ

6

ø1618

ø14.5 (through hole)

2.5

2-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(NBR
hardness 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

C

22.5 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

FH

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)

18
2.5

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

CA

A

A

60

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.jp

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