COU SERIESCO SERIES※※Except for CO-52/CO-152※

CONCEALED DOOR CLOSERS
Model chart
COU SERIES(Thinner body type)
Model No.

Applicable door size

Hotel Door
Without hold-open With hold-open With backcheck For(Thinner guide rail)

Applicable door thickness (mm)Width (mm)Weight (kg)COU-52

COU-152

COU-52BC

COU-52H

900

45 or less

COU-53

COU-153

COU-53BC

COU-53H

950

65 or less

Steel door

Wooden door

36 or more

40 or morePage
6

CO SERIES
Applicable door size

Model No.

Applicable door thickness (mm)Page

Without hold-open

With hold-open

With backcheckWidth (mm)Weight (kg)

Steel door

Wooden door

CO-52

CO-152

CO-52BC

900

45 or less40 or more

45 or more

6CO-53

CO-153

CO-53BC

950

65 or less

CO-54

CO-154

CO-54BC

1050

85 or less45 or more

50 or more

7CO-55

CO-1551200

120 or less1500

180 or less60 or more

65 or more

7CO-56

ES Stopper Model(Option)
Applicable door size

Model No.
Without hold-open

With hold-open

With backcheck

Applicable door thickness (mm)Width (mm)Weight (kg)CO-155ES

1200

120 or lessCO-156ES

1500

180 or less

No.COU-153 R

Right hand door

Steel door

Wooden door60 or more

65 or more

Left hand door

frame

frame

● Right hand or Left hand hasPageframe

Door
opening
directions

to be specified for COU-52,53,152,153,52BC● ES：ES Stopper Model(option)● H：For Hotel Door(Thinner guide rail)Door● 2 to 6：SizeorDo● No number ： Without hold-open●1： With hold-open● U：Thinner body typeInstallation

Door Cut dimension●COU-52,53 (Thinner body type)（Body thickness 28mm）

2●CO-52（Body thickness 31mm）●CO-53, 54（Body thickness 36mm）●CO-55, 56（Body thickness 48mm）

Steel door

Wooden door

Steel door

Wooden door

28.5

28.5

31.5

31.5

Steel door
36.5

Wooden door
36.5

Steel door
48.5

Wooden door
48.5

36 or more

40 or more

40 or more

45 or more

45 or more

50 or more

60 or more

65 or moreCONCEALED DOOR CLOSERS
Specification and adjustment
Speed adjustment range (CO-52/CO-152)●

There are two speed ranges for door closing speed.

●

Those ranges are classified into two stages of the 1st speed range●CO-52/CO-152
2nd closing speed
adjustment valve

which controls general door closing speed and the 2nd speed range.
●●

1st closing speed
adjustment valve

Those speeds can be adjusted independently.

2nd speed range

Closing time from the door opened at 90 degrees is appropriately 5 to

1st speed range

8 seconds. (Set the 2nd speed slightly slower than the 1st speed.)

Speed adjustment range (Except for CO-52/CO-152)●●

There are two speed ranges for door closing speed.
Those ranges are classified into three stages, 1st speed range
Latching action range

which controls general door closing speed, 2nd speed range,

2nd speed rangeand latching action range.
●

Those speeds can be adjusted independently.

●Closing time from the door opened at 90 degrees is appropriately 5 to

1st speed range

8 seconds. (Set the 2nd speed slightly slower than the 1st speed.)

Latching action function (Except for CO-52/CO-152)●

Door can be closed by the latching action function to quickly close in 2 degrees

Speed adjustment valve

before closing position.
●The latching action does not move slower than the 2nd speed.

●COU-52,53

Slower●CO-53,54

Faster●CO-55,56

2nd closing speed adjustment valve

2nd speed adjustment valve
Latching action adjustment valve

Latching action adjustment valve
1st closing speed adjustment valve

1st speed adjustment valve

Hexagon socket wrench
for adjustment (3mm)

1st speed adjustment valve
2nd speed adjustment valve

Latching action adjustment valve

Hydraulic backcheck function (CO-55,56)●

This function prevents accidents and injuries and door damage which occurs due to a door suddenly
opening by a strong wind or rough handling before it happens.

B●The door becomes heavier when it operates, however, this is all by design.

BThe door opens smoothly if it is slowly pushed.
BBBBB

●

B

When installing the door closer equipped with the backcheck function, sufficiently reinforce thehanging hardware and supporting plate.

Backcheck operating range●Mechanical backcheck is available on models COU-52, 53, CO-52, 53, 54.

Backcheck adjustment valve

Backcheck adjustment valve
Stronger

WeakerHexagon socket wrench
for adjustment (3mm)Back check device(for "Mechanical backcheck")3CONCEALED DOOR CLOSERS
Specification and how to adjust
Optional Specification
One Touch Joint Function

Silent slider

ES Stopper

Arm and Slider can be
jointed by hand without
tool. This shortens theinstallation time.

Snap!

Stopper with stop setting up to size 6 torque

One-touch detachable typeHold-open device●Adjustment of hold-open angle

・Hold-open angle can be adjusted by changing the installation positionof the hold-open device.
・The hold-open angle is a maxium opening angle in the case of a stopper
device (non hold-open).

654321●Adjustment of hold-open force

・Hold-open force can be adjusted by turning the adjustment screw.
・Reference for adjustment
Model No.

Stronger

Adjustment range

COU-152
0〜3.6kgf·m (0〜36N·m)
CO-152
COU-153
0〜3.1kgf·m (0〜31N·m)
CO-153
CO-154 0〜2.7kgf·m (0〜27N·m)
CO-155 0〜3.7kgf·m (0〜37N·m)

WeakerAdjustment nut (M5)

Hold-open device, stopper device installation position

ES Stopper (option)

ES Stopper (option)
・Hold-open force can be adjusted by turning the adjustment screw.

・Reference for adjustment
65432

1

Hold-open device, stopper device installation position

Model No.

Adjustment range

CO-155ES 3〜15kgf·m (30〜150N·m)
CO-156ES 2〜14kgf·m (20〜140N·m)
Stronger

4Weaker

CONCEALED DOOR CLOSERS
Parts and accessories
No. Name of Parts and Accessories
1Body

2

Mounting plate
3-A

3
45

Arm

4-A
Guide rail
5-A
Slider

6-A
6

3-B
Arm for ES-Stopper

4-B
Guide rail for H type
5-B
5-C
Slider for ES-Stopper Slider for H type

6-B

6-C

6-D

4B

6-E

Stopper
Stop metal
Backcheck device Stopper for Stopper(for "Without fitting (for "With (for "Mechanical ES-Stopper for H typehold-open") hold-open")backcheck")

4A

7＋Flat head machine screw○(With M3 head)(M4, L=6-2pcs)

8

Hexagon socket
Flat head screw (M5, L=16)

9Washer

10＋Flat head machine screw○(With M4 head)(M5, L=12-5pcs)

6A
1011＋Flat head tapping screw○11(φ4, L=25-5pcs)
COU-52,53

CO-52,53,54＋Flat head machine ＋○○Flat head machine
screw (with M4 head)
screw
screw
(M5, L=12-4pcs)(M5, L=12-4pcs)(M6, L=12-4pcs)

13＋○Flat head machine ○＋Flat head machine ＋○Flat head machine
screw (with M4 head)
screw
screw
(M5, L=12-4pcs)(M5, L=12-4pcs)(M6, L=16-4pcs)

14＋○Flat head tapping
screw(φ4, L=25-4pcs)‒●Stopper 6-A is equipped for "without hold-open type".
COU-52,53,CO-52,53,54,55,56●Stop metal fitting 6-B (hold open device) is equipped for“with hold open type”. COU-152,153,CO-152,153,154,155●Backcheck device 6-C is equipped for "with mechanicalbackcheck type". COU-52BC,53BC,CO-52BC,53BC,54BC

6D

6B
75B
6C
3A

CO-55,56○Flat head machine
12 ＋＋Flat head tapping○screw(φ5, L=30-4pcs)

6E

5C

5A

3B

891413122
15

CONCEALED DOOR CLOSERSDRAWING
Size 2, 3 (Thinner body type）
Model
Applicable door size
Applicable door thickness（mm）"P" dimension Hold-open, stopper, backcheck device installation position
Type
Hotel Door（offset dimension） ①
②
③
④
⑤
⑥
Without hold-open With hold-open With backcheck For
Wooden door(Thinner guide rail) Width（mm） Weight（kg） Steel door
900
45 or less
COU-52 COU-152 COU-52BC COU-52HMaximum.
2075° 80° 86° 91° 97° 104°
36 or more 40 or more
Opening angle95065 or less
COU-53 COU-153 COU-53BC COU-53H
Hold-open, stopper, backcheck device installation position depends on "P" dimension.
146
Right hand door

544（Cut off on lateral door）
6Left hand door

105

400

12 21

Latching speed adjustment valve●This drawing is for COU-52, 53 right hand.

2nd speed
1st speed adjustment valve
adjustment valve
280

P●Door stopper must be installed together.

2228
19

●This model has right hand and left hand.

8152
Center of hinge
B

530
39 A

3.2

53.5

393.2

12 A

160

Cut offGuide rail

φ122323250

152296160

A
B＋Flat head machine screw M5×12ℓ
4-○(with M4 head)＋Tapping screw φ4×25ℓ
4-○

Body

11.5

2813

COU-52,53,
COU-52H,152,153,
53H
52BC,53BC
19mm
14.5mm
29mm
23mm

126

126

126

13126

B

Model

＋Flat head machine screw M5×12ℓ
5-○(with M4 head)＋Tapping screw φ4×25ℓ
5-○

296

68.2

Position ofdoor stopper device
15mm or more

8Arm

⑥⑤④③②

①

Hold-open device, stopper device, backcheck device installation position

Size 2Model

Applicable door size

Applicable door thickness（mm）Without hold-open With hold-open With backcheck Width（mm） Weight（kg） Steel door

CO-52

CO-152 CO-52BC

900

45 or less 40 or more 45 or more"P" dimension Hold-open, stopper, backcheck device installation position（offset dimension） ①②
③
④⑤
⑥

Type

Wooden door

Maximum.
Opening angle

20

76°

81°

86°

92°

98°

105°

Hold-open, stopper, backcheck device installation position depends on "P" dimension.
542（Cut off on lateral door）

146
99.5

9.5
Right hand door

12 21400

Left hand door

3120

2nd speed
1st speed adjustment valveadjustment valve
260

P●This model can be used on both RH

and LH doors.
●Door stopper must be installed
together.

22●This drawing shows right opening door.

8530
9 1933.2

8.5

31

Guide rail

58.5

912 193158

3.2

Cut off＋Flat head machine screw M5×12ℓ
4-○＋Tapping screw φ5×30ℓ
4-○

Body

φ1223.5

229

155.5

23.5276

158

126

126

29

1366＋Flat head machine screw M5×12ℓ
5-○(with M4 head)＋Tapping screw φ4×25ℓ
5-○Center of hinge

70.2

Position ofdoor stopper device 2915mm or more8276155.5

Arm5432

1

Hold-open device, stopper device, backcheck device installation position

126

126

13CONCEALED DOOR CLOSERSDRAWING
Size 3, 4Model

Applicable door size

Applicable door thickness（mm）

Without hold-open With hold-open With backcheck Width（mm） Weight（kg） Steel door Wooden door
950
65 or lessCO-53 CO-153 CO-53BC
45 or more 50 or more
1050
85 or lessCO-54 CO-154 CO-54BC

Maximum.
Opening angle

20

81°

76°

86°

92°

98°

105°

Hold-open, stopper, backcheck device installation position depends on "P" dimension.
568（Cut off on lateral door）

120
29
Right hand door

"P" dimension Hold-open, stopper, backcheck device installation position（offset dimension） ①②③④⑤⑥Type

40010612 21

Latching speed adjustment valve

Left hand door

●This drawing shows right opening door.

22
8

270

8＋Flat head machine screw M5×12ℓ
5-○(with M4 head)＋Tapping screw φ4×25ℓ
5-○

286

149
Center of hinge

193

Guide rail

9φ14

8.5

36＋Flat head machine screw M5×12ℓ
4-○＋Tapping screw φ5×30ℓ
4-○

Body

66

3.2

3

12 1993.2

Cut off530

158

2977.7Position ofdoor stopper device
15mm or moreArm

1st speed adjustment valve

2nd speedadjustment valve

Pand LH doors.
●Door stopper must be installed
together.

2036●This model can be used on both RH

240

23

23286

149
13

126

126

126

126

13

29

158

⑥

⑤

④

③

②

①

Hold-open device, stopper device, backcheck device installation position

Size 5, 6
Model

Applicable door size

Without hold-open With hold-open

CO-55
CO-56

Applicable door thickness（mm）

Width（mm） Weight（kg） Steel door

CO-1551200
1500

120 or less
180 or less60 or more

Maximum.
Opening angle65 or more

2077°

82°

87°

93°

99°

106°

Hold-open, stopper, backcheck device installation position depends on "P" dimension.
553（Cut off on lateral door）
400
Backcheck valve

133
113
2nd speed
adjustment valve

5Right hand door

"P" dimension Hold-open device, stopper device installation position（offset dimension） ①
②
③
④⑤
⑥Type

Wooden door

Left hand door

1st speed
adjustment valve

22.5
12.5

48
32

●This model can be used on both RH

and LH doors.

25●This drawing is for CO-55, 56 right hand.

Armtogether.
●2nd closing speed is adjusted withuninstallation of closer unit.

P●Door stopper must be installed

1010348
368

138

Center of hinge

4-○＋Flat head machine screw M6×16ℓ

78

10.5

13.5

Body

1193.5

Cut off

Guide rail

4.5

3
19

29

530

10.5
319156

5-○＋Flat head machine screw M5×12ℓ(with M4 head)

φ16

Latching speed adjustment valve

22156

324
13

126

22
126

126

126

13

29

48

138

⑥⑤

④③

②

①

Hold-open device, stopper device installation position

7

RYOBI LIMITED

5-2-8 Toshima, Kita-ku Tokyo 114-8518, JapanTel. 81-3-3927-5536 Fax. 81-3-3927-5527
RYOBI is a registered trade mark of Ryobi LimitedA