Notice regarding changes to model numbers for Mechanical Overload Protectors Products Information

Model numbers for Torque Limiter, Shock Guard®, and Torque Keeper will change from April 2, 2018.

To meet customer demand we will expand the number of possible combinations to one million with new model numbers.

Expanded service

We expanded the available range of finished keyways.: Customers can incorporate these products without any disassembly or assembly.

Bore tolerance Max. 9 types

You can select from a wide variety of bore tolerances.

[Tolerances available]
F7, G7, H7, JS7, P7, M7, N7, K7, R7

Shaft bore diameter 1mm units

Shaft bore diameters are in 1mm units.

Keyway tolerance Max. 4 types

[Tolerances available]
New JIS Js9, New JIS P9, Old JIS E9, Old JIS F7

Set screw positioning Max. 9 types

Can be locked at any desired position.

Model number changes

Torque settings will be shown in SI units instead of gravitational units: When your product is delivered with torque settings displayed, the torque will now be shown in SI units (N·m) instead of gravitational units (kgf·m) as with the previous models.

Searching for replacements for previous models

We are providing an on-line service that will give you the new (replacement) model when you enter the previous model. *After changing model numbers, we will update the link to this service on the product pages of each series.

Example of model numbers

Example of new model numbers (before and after change)

Example of Torque Limiter TL Series Model number changes

TL Series Details of model number changes

No-coupling type

Before change

TL250	-	2	-	04022	-	20	J	-	5
						(1)	(2)		(3)

(1) Shaft bore diameter mm
(2) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 1 location)
(3) Set torque value kgf·m

After change

250

04022

N49

Series

Size

Number of disc springs

Sprocket model number

Torque Limiter side

Shaft bore tolerance

Shaft bore diameter

Keyway tolerance

Set screw positioning

Set torque value

Size

Number of disc springs

[TL200 to TL700]
1L, 1, 2
[TL10]
16, 24
[TL14]
10, 15
[TL20]
6, 12

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
E: Old JIS E9
F: Old JIS F7

Set screw positioning (Position from adjusting nut side)

D0
D1 (Standard)
D2
D3
D4
D5
D6
D7
D8

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

We can provide only D0 for TL200, and D1, D3, D4 for TL250 to 700.
Refer to the Tsubaki Overload Protector catalog for available sprocket sizes.
The code T indicating Torque Limiter side will be shown for no-coupling type as well after the change.

Coupling Type

Before change

TL250	-	2C	-	T	18	J	X	C	30	J	-	5
				(1)	(2)	(3)		(1)	(2)	(3)		(4)

(1) T: Torque Limiter side, C: Coupling side
(2) Shaft bore diameter mm
(3) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 1 location)
(4) Set torque value 5kgf·m

After change

250

H18JD1

H30JD1

N49

Series

Size

Number of disc springs

Type

Torque Limiter side

Same notation as no-coupling type

Coupling side

Same notation as no-coupling type

Set torque value

Size

Number of disc springs

[TL200 to TL700]
1L, 1, 2
[TL10]
16, 24
[TL14]
10, 15
[TL20]
6, 12

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
E: Old JIS E9
F: Old JIS F7

Set screw positioning *

D0
D1 (Standard)
D2
D3
D4
D5
D6
D7
D8

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

Note: The set screw position of the Torque Limiter side is as seen from the adjusting nut side, and the set screw position of the coupling side is as seen from the hub side.

Example of Shock Guard TGB Series Model number changes

TGB Series Details of model number changes

No-coupling type

Before change

TGB30	-	H	-	30	J	-	15
				(1)	(2)		(3)

(1) Shaft bore diameter mm
(2) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations at 90º)
(3) Set torque value kgf·m

After change

TGB	30	-	H	-	T	H	30	J	D2	-	N147
Series	Size		Spring strength		Shock Guard side	Shaft bore tolerance	Shaft bore diameter	Keyway tolerance	Set screw positioning		Set torque value

Size

Spring strength

L: Weak
M: Medium
H: Strong
The spring type differs depending on size.

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7
*TGB08 to 16: Grade 8

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7
E: Old JIS E9

Set screw positioning (Position from adjusting nut side)

D0
D1
D2 (Standard)
D3
D4
D5
D6
D7
D8

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

We can provide only D2 for TGB08 to TGB16
The code T indicating Shock Guard side will be shown for no-coupling type as well after the change.

Coupling Type

Before change

TGB50	-	LC	-	T	35	J	X	C	45	E	-	10
				(1)	(2)	(3)		(1)	(2)	(3)		(4)

(1) T: Shock Guard side, C: Coupling side
(2) Shaft bore diameter mm
(3) [Shock Guard side] Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations at 90º), [Coupling side] Bore tolerance: H7, Keyway tolerance： Old JIS E9 (Set screws at 2 locations at 90º)
(4) Set torque value kgf·m

After change

TGB

H35JD2

H45ED2

N98

Series

Size

Spring strength

Type

Shock Guard side

Same notation as no-coupling type

Coupling side

Same notation as no-coupling type

Set torque value

Size

08
12
16
20
30
50
70
* 90
* 110
* 130

Spring strength

L: Weak
M: Medium
H: Strong
*The spring type differs depending on size.

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7
*The shaft bore tolerances are all Grade 7.

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7
E: Old JIS E9

Set screw positioning *

D0
D1
D2 (Standard)
D3
D4
D5
D6
D7
D8

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

Note: The set screw position of the Shock Guard side is as seen from the adjusting nut side, and the set screw position of th* coupling side is as seen from the hub side.

Example of Shock Guard TGX Series Model number changes

TGX Series Details of model number changes

No-coupling type

Before change

TGX35	-	H	-	30	J	-	15
				(1)	(2)		(3)

(1) Shaft bore diameter mm
(2) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations at 90º)
(3) Set torque value kgf·m

After change

TGX	35	-	H	-	T	H	30	J	D2	-	N147
Series	Size		Spring strength		Shock Guard side	Shaft bore tolerance	Shaft bore diameter	Keyway tolerance	Set screw positioning		Set torque value

Size

Spring strength

L: Weak
M: Medium
H: Strong

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7
E: Old JIS E9

Set screw positioning (Position from adjusting nut side)

D0
D1
D2 (Standard)
D3
D4
D5
D6
D7
D8

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

The code T indicating Shock Guard side will be shown for no-coupling type as well after the change.

Coupling Type

Before change

TGX50	-	LC	-	T	35	J	X	C	45	E	-	10
				(1)	(2)	(3)		(1)	(2)	(3)		(4)

(1) T: Shock Guard side, C: Coupling side
(2) Shaft bore diameter mm
(3) [Shock Guard side] Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations at 90º), [Coupling side] Bore tolerance: H7, Keyway tolerance： Old JIS E9 (Set screws at 2 locations at 90º)
(4) Set torque value kgf·m

After change

TGX

H35JD2

H45ED2

N98

Series

Size

Spring strength

Type

Shock Guard side

Same notation as no-coupling type

Coupling side

Same notation as no-coupling type

Set torque value

Size

Spring strength

L: Weak
M: Medium
H: Strong

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7
E: Old JIS E9

Set screw positioning *

D0
D1
D2 (Standard)
D3
D4
D5
D6
D7
D8

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

Note: The set screw position of the Shock Guard side is as seen from the adjusting nut side, and the set screw position of the coupling side is as seen from the hub side.

Example of Shock Guard TGM Series Model number changes

TGM Series Details of model number changes

No-coupling type

Before change

TGM60	-	D30	-	WS	-	2.5
		(1)		(2)		(3)

(1) Shaft bore diameter mm, Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 3 location)
(2) Spring type: WS = Weak spring
(3) Set torque value kgf·m

After change

TGM	60	-	T	H	30	J	DY	-	WS	-	N25
Series	Size		Shock Guard side	Shaft bore tolerance	Shaft bore diameter	Keyway tolerance	Set screw positioning		Spring type		Set torque value

Size

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7
E: Old JIS E9

Set screw positioning (Position from LS Detecting Plate)

Spring type

No: Standard spring
WS: Weak spring (Except TGM6, TGM800)
SS: Enhanced spring (Except TGM3, TGM400)

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

The code T indicating Shock Guard side will be shown for no-coupling type as well after the change.

Coupling Type

Before change

TGM60C	-	D20	X	C	30	E	-	WS	-	10
		(1)		(2)	(3)	(4)		(5)		(6)

(1) Shock Guard side, Shaft bore diameter mm, Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 3 locations)
(2) C: Coupling side
(3) Shaft bore diameter mm
(4) Shaft bore tolerance: H7 Keyway tolerance: Old JIS E9 (Set screws at 2 locations at 90º)
(5) Spring type: WS = Weak spring
(6) Set torque value kgf·m

After change

TGM

H20JDY

H30E

N18

Series

Size

Type

Shock Guard side

Same notation as no-coupling type

Coupling side

Same notation as no-coupling type

Set screw positioning *

Spring type

Set torque value

Size

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7
E: Old JIS E9

Set screw position of the coupling side *

D0
D1
D2 (Standard)
D3
D4
D5
D6
D7
D8

Spring type

No: Standard spring
WS: Weak spring
(Except TGM6, TGM800)
SS: Enhanced spring
(Except TGM3, TGM400)

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

Note: The set screw position of the Shock Guard side is as seen from the LS detecting plate side, and the set screw position of the coupling side is as seen from the hub side.

Torque Keeper TFK Series Model number changes

TFK Series Details of model number changes

No-coupling type

Before change

TFK35	-	1	-	25	J	-	2.5
				(1)	(2)		(3)

(1) Shaft bore diameter mm
(2) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 1 location on the keyway)
(3) Set torque value kgf·m

After change

TFK	35	-	1	-	T	H	25	J	D1	-	N25
Series	Size		Number of disc springs		Torque Keeper side	Shaft bore tolerance	Shaft bore diameter	Keyway tolerance	Set screw positioning		Set torque value

Size

Number of disc springs

1L: Weak
1: 1pc
2: 2pc

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7
E: Old JIS E9

Set screw positioning (Position from adjusting nut side)

D1 (Standard)
D2
D3
D4
D5

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

We can provide only D0 for TFK200, and D1, D3, D4 for TFK250 to 700.
Refer to the Tsubaki Overload Protector catalog for available sprocket sizes.
The code T indicating Torque Keeper side will be shown for no-coupling type as well after the change.

Coupling Type

Before change

TFK25	-	1C	-	T	20	J	X	C	20	J	-	1.6
				(1)	(2)	(3)		(1)	(2)	(3)		(4)

(1) T: Torque Keeper side, C: Coupling side
(2) Shaft bore diameter mm
(3) [Torque Keeper side] Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 1 location), [Coupling side] Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations)
(4) Set torque value kgf·m

After change

TFK

H20JD1

H20J

N16

Series

Size

Number of disc springs

Type

Torque Keeper side

Same notation as no-coupling type

Coupling side

Same notation as no-coupling type

Set screw positioning *

Set torque value

Size

Number of disc springs

[TFK200 to TFK700]
1L, 1, 2
[TFK10]
16, 24
[TFK14]
10, 15
[TFK20]
6, 12

Shaft bore tolerance

F: F7
G: G7
H: H7
J: JS7
P: P7
M: M7
N: N7
K: K7
R: R7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
E: Old JIS E9
F: Old JIS F7

Set screw positioning (Coupling side) *

D0
D1
D2
D3
D4
D5 (Standard)
D6
D7
D8

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

Note: The set screw position of the Torque Keeper side is as seen from the adjusting nut side, and the set screw position of the coupling side is as seen from the hub side.

Example of Shock Guard TGF Series Model number changes

TGF Series Details of model number changes

No-coupling type

Before change

TGF20	-	L2	-	20	J	-	1.9
				(1)	(2)		(3)

(1) Shaft bore diameter mm
(2) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations at 90º)
(3) Set torque value kgf·m

After change

TGF

N19

Series

Size

Spring strength

Type

Shock Guard side

Shaft bore tolerance

Shaft bore diameter

Keyway tolerance

Set screw positioning

Set torque value

Size

Spring strength

L: Weak
M: Medium
H: Strong

Type

2: Type2
3: Type3

Shaft bore tolerance

F: F7
G: G7
H: H7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7

Set screw positioning (Position from adjusting nut side)

D0
D2 (Standard)
D3
D4
D5

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

The code T indicating Shock Guard side will be shown for no-coupling type as well after the change.

Coupling Type

Before change

TGF20	-	L5	-	T	20	P	X	C	30	P	-	1.8
				(1)	(2)	(3)		(1)	(2)	(3)		(4)

(1) T: Shock Guard side, C: Coupling side
(2) Shaft bore diameter mm
(3) [Shock Guard side] Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations, on the keyway), [Coupling side] Bore tolerance: H7, Keyway tolerance： Old JIS E9 (Set screws at 2 locations at 90º)
(4) Set torque value kgf·m

After change

TGF

H20PD2

H30PD2

N18

Series

Size

Spring strength

Type

Shock Guard side

Same notation as no-coupling type

Coupling side

Same notation as no-coupling type

Set torque value

Size

Spring strength

L: Weak
M: Medium
H: Strong

Type

5: Type5
7: Type7

Shaft bore tolerance

F: F7
G: G7
H: H7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7

Set screw positioning *

D0
D2 (Standard)
D3
D4
D5

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

Note: The set screw position of the Shock Guard side is as seen from the adjusting nut side, and the set screw position of the coupling side is as seen from the hub side.

Example of Shock Guard TGK Series Model number changes

TGK Series Details of model number changes

No-coupling type

Before change

TGK20	-	A2	-	20	J
				(1)	(2)

(1) Shaft bore diameter mm
(2) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations at 90º)

After change

TGK	20	-	A	2	-	T	H	20	J	D2
Series	Size		Air pressure	Type		Shock Guard side	Shaft bore tolerance	Shaft bore diameter	Keyway tolerance	Set screw positioning

Size

Air pressure

A: Air pressure

Type

2: Type 2

Shaft bore tolerance

F: F7
G: G7
H: H7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7

Set screw positioning (Position from adjusting nut side)

D0
D2 (Standard)
D3
D4
D5

The code T indicating Shock Guard side will be shown for no-coupling type as well after the change.

Coupling Type

Before change

TGK20	-	A5	-	T	20	J	X	C	30	P
				(1)	(2)	(3)		(1)	(2)	(3)

(1) T: Shock Guard side, C: Coupling side
(2) Shaft bore diameter mm
(3) Bore tolerance: H7, Keyway tolerance： Old JIS E9 (Set screws at 2 locations at 90º)

After change

TGK	20	-	A	5	-	T	H20JD2	-	C	H30JD2
Series	Size		Air pressure	Type		Shock Guard side	Same notation as no-coupling type		Coupling side	Same notation as no-coupling type

Size

Air pressure

A: Air pressure

Type

5: Type 5
7: Type 7

Shaft bore tolerance

F: F7
G: G7
H: H7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7

Set screw positioning *

D0
D2 (Standard)
D3
D4
D5

Note: The set screw position of the Shock Guard side is as seen from the adjusting nut side, and the set screw position of the coupling side is as seen from the hub side.

Example of Shock Guard TGE Series Model number changes

TGE Series Details of model number changes

No-coupling type

Before change

TGE50	-	M3	-	40	J	-	25
				(1)	(2)		(3)

(1) Shaft bore diameter mm
(2) Bore tolerance: H7, Keyway tolerance： New JIS Js9 (Set screws at 2 locations at 120º)
(3) Set torque value kgf·m

After change

TGE

N245

Series

Size

Spring strength

Type

Shock Guard side

Shaft bore tolerance

Shaft bore diameter

Keyway tolerance

Set screw positioning

Set torque value

Size

Spring strength

L: Weak
M: Medium
H: Strong

Type

1: Type1
3: Type3

Shaft bore tolerance

F: F7
G: G7
H: H7

Shaft bore diameter

1mm units

Keyway tolerance

J: New JIS Js9
P: New JIS P9
F: Old JIS F7

Set screw positioning (Position from adjusting nut side)

D0
D2 (Standard)
D3
D4

Set torque value

The torque setting is shown in N·m units.
*Shown to one decimal place when the torque setting is less than 10N·m.

The code T indicating Shock Guard side will be shown for no-coupling type as well after the change.