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.
- D0
- D1
- D2
- D3
- D4
- D5
- D6
- D7
- D8
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.
Torque Limiter
Shock Guard
Torque Keeper
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
TL | 250 | - | 2 | - | 04022 | - | T | H | 20 | J | D1 | - | 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
- 200
- 250
- 350
- 500
- 700
- 10
- 14
- 20
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
TL | 250 | - | 2 | C | - | T | H18JD1 | X | C | 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
- 200
- 250
- 350
- 500
- 700
- 10
- 14
- 20
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
- 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
- *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 | 50 | - | L | C | - | T | H35JD2 | X | C | 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
- 10
- 20
- 35
- 50
- 70
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 | 50 | - | L | C | - | T | H35JD2 | X | C | 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
- 10
- 20
- 35
- 50
- 70
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
- 3
- 6
- 20
- 60
- 200
- 400
- 800
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)
- DY
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 | 60 | C | - | T | H20JDY | X | C | H30E | D2 | - | WS | - | 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
- 3
- 6
- 20
- 60
- 200
- 400
- 800
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
- 20
- 25
- 35
- 50
- 70
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 | 25 | - | 1 | C | - | T | H20JD1 | X | C | H20J | D5 | - | 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
- 200
- 250
- 350
- 500
- 700
- 10
- 14
- 20
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 | 20 | - | L | 2 | - | T | H | 20 | J | D2 | - | N19 |
Series | Size | Spring strength | Type | Shock Guard side | Shaft bore tolerance | Shaft bore diameter | Keyway tolerance | Set screw positioning | Set torque value |
Size
- 20
- 30
- 45
- 65
- 90
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 | 20 | - | L | 5 | - | T | H20PD2 | - | C | 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
- 20
- 30
- 45
- 65
- 90
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
- 20
- 30
- 45
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
- 20
- 30
- 45
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 | 50 | - | M | 3 | - | T | H | 40 | J | D2 | - | N245 |
Series | Size | Spring strength | Type | Shock Guard side | Shaft bore tolerance | Shaft bore diameter | Keyway tolerance | Set screw positioning | Set torque value |
Size
- 17
- 25
- 35
- 50
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.