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Jaw Couplings High Rigidity Single Disc Carbon Steel Keyless Type
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Part Number
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Product Overview
High-rigidity flexible coupling designed with a unique diaphragm fastening section.
[Features]
· Four models for shaft diameters from ⌀12 (12 mm) to ⌀60 (60 mm), with 45 standardized sizes.
· The originality of the diaphragm fastening section provides high torsional rigidity.
· Allows angular misalignment and end play.
· Low moment of inertia.
[Applications]
· Machine tools, precision platforms, etc.
[Features]
· Four models for shaft diameters from ⌀12 (12 mm) to ⌀60 (60 mm), with 45 standardized sizes.
· The originality of the diaphragm fastening section provides high torsional rigidity.
· Allows angular misalignment and end play.
· Low moment of inertia.
[Applications]
· Machine tools, precision platforms, etc.
Dimensional Drawing
The recommended tolerance for the applicable shaft is h7.Eccentricity adjustment has been completed and assembly finished before shipment.There are two threaded holes for removal on the keyless flange section. For hole sizes of ⌀20 and above for the locking bolts, threaded holes for removal are provided inside.When disassembling, screw in an M6 bolt.
For installation and removal methods of the keyless type, please refer to the basic information for confirmation.
■Material specifications
Type | Diaphragm type | Body | Diaphragm |
| ||
Keyless on both sides | Keyless on one side · Keyway hole type on one side |
|
|
| ||
E-LDBL02-D | E-LDBL56-D | Single disc type | S45C | Blackened | SUS304 | Locking Bolts / Set Screws |
Accessories
Material
Surface treatmentSpecification Table
Please follow the selection steps
to 
to choose the type and parameters before placing an order. Please specify the shaft bore diameter within the range of d1 ≤ d2.Type (Type· D) | — |  d1 | — | d2 |
| E-LDBL02-D65 | — | 20 | — | 35 |
| E-LDBL56-D65 | — | 18 | — | 22 |
| Type | d1 and d2 selection (but d1 ≤ d2) | L | LF | S | Keyless side locking screw M1 | Removal screw M2 | |||||||||||||||
| Type | D | ||||||||||||||||||||
| E-LDBL02-D Keyless on both sides | 65 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 68.6 | 25.8 | 5.7 | M6 | M6 | |
| 87 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 77 | 28.25 | 8.5 | M6 | M6 | ||||
| Type | d1 and d2 selection (but d1 ≤ d2) | L | ⌀N1 | ⌀N | LF1 | LF2 | S | Keyway side fixing screw M | Keyless side locking screw M1 | Removal screw M2 | ||||||||||||||||
| Type | D | |||||||||||||||||||||||||
| E-LDBL56-D Single keyless side · Single keyway hole side | 65 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 63 | 46 | 58 | 25.8 | 24.9 | 5.7 | M6 | M6 | M6 | ||
| 87 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 72 | 56 | 74 | 28.25 | 29 | 8.5 | M8 | M6 | M6 | |||||
■ Characteristic values
| Type | Permissible torque (N⋅m) | Permissible angular misalignment (°) | Permissible axial deviation (mm) | Permissible speed (RPM) | Static torsional stiffness (N.m/rad) | Moment of inertia (N.m) | Fastening screw | Weight (g) | ||
| Type | D | M | Locking torque N.m | |||||||
| E-LDBL02-D Keyless on both sides | 65 | 210 | 0.5 | ±0.5 | 7000 | 75000 | 3.6 × 10-4 | M6 | 13 | 1000 |
| 87 | 390 | 6000 | 110000 | 1.2 × 10-3 | 1230 | |||||
| Type | Permissible torque (N⋅m) | Permissible angular misalignment (°) | Permissible axial deviation (mm) | Permissible speed (RPM) | Static torsional stiffness (N.m/rad) | Moment of inertia (N.m) | Fastening screw | Weight (g) | ||
| Type | D | M | Locking torque N.m | |||||||
| E-LDBL56-D Single keyless side · Single keyway hole side | 65 | 210 | 0.5 | ±0.5 | 7000 | 75000 | 3.0 × 10-4 | M6 | 13 | 920 |
| 87 | 390 | 6000 | 110000 | 1.0 × 10-3 | 1120 | |||||
The values for static torsional stiffness constant, moment of inertia, and weight are based on the maximum shaft diameter.
Eccentricity is not allowed for single diaphragm type.
| Shaft bore diameter d1 · d2 | b (keyway width) | t Keyway depth | Key nominal size b x h | |
| LK | RK | |||
| 8 to 10 | 3 | 3 | 1.4 | 3 × 3 |
| 11 to 12 | 4 | 4 | 1.8 | 4 × 4 |
| 13 to 17 | 5 | 5 | 2.3 | 5 × 5 |
| 18 to 22 | 6 | 6 | 2.8 | 6 × 6 |
| 23 to 30 | 8 | 8 | 3.3 | 8 × 7 |
| 31 to 38 | 10 | 10 | 3.3 | 10 × 8 |
| 39 to 44 | 12 | 12 | 3.3 | 12 × 8 |
| 45 to 50 | 14 | 14 | 3.8 | 14 × 9 |
Product Features
The keyless type supports a maximum applicable torque of up to 250 N⋅m.
Product Installation
● Installation
(1) Please wipe off any dirt from the surface of the shaft and apply a thin layer of lubricating oil or grease.
(Do not use lubricating oil or grease containing molybdenum-based friction modifiers.)
(2) Similarly, clean the contact surface of the inner diameter of the coupling and apply machine oil or grease. At the same time, apply lubricant to the threaded surface and the head contact surface of the locking bolts.
(3) Mount the coupling onto the shaft.
(Do not tighten the keyless flange with bolts if the shaft has not passed through.)
(4) After positioning is complete, first use a torque wrench to gently tighten the locking bolts in a diagonal sequence (to about 1/4 of the specified tightening torque).
(5) Then, increase the tightening torque (to about 1/2 of the specified tightening torque) and tighten again.
(6) Tighten using the specified tightening torque.
(7) Finally, tighten each locking bolt one by one in a circumferential order.
● Installation precautions
· Tighten the locking bolts after the coupling is mounted onto the shaft end.
(If the bolts are tightened before insertion, the bushing will become deformed.)
· Please use a torque wrench to tighten the bolts.
· Be sure to use the supplied bolts for the locking bolts.
● Removal
· Please perform this work only when the equipment is completely stopped.
· Loosen the locking bolts one by one in a circumferential order.
· Insert the bolts into the removal threaded holes and tighten them evenly.
· When reinstalling, repeat the steps in the "Installation" section.
(1) Please wipe off any dirt from the surface of the shaft and apply a thin layer of lubricating oil or grease.
(Do not use lubricating oil or grease containing molybdenum-based friction modifiers.)
(2) Similarly, clean the contact surface of the inner diameter of the coupling and apply machine oil or grease. At the same time, apply lubricant to the threaded surface and the head contact surface of the locking bolts.
(3) Mount the coupling onto the shaft.
(Do not tighten the keyless flange with bolts if the shaft has not passed through.)
(4) After positioning is complete, first use a torque wrench to gently tighten the locking bolts in a diagonal sequence (to about 1/4 of the specified tightening torque).
(5) Then, increase the tightening torque (to about 1/2 of the specified tightening torque) and tighten again.
(6) Tighten using the specified tightening torque.
(7) Finally, tighten each locking bolt one by one in a circumferential order.
● Installation precautions
· Tighten the locking bolts after the coupling is mounted onto the shaft end.
(If the bolts are tightened before insertion, the bushing will become deformed.)
· Please use a torque wrench to tighten the bolts.
· Be sure to use the supplied bolts for the locking bolts.
● Removal
· Please perform this work only when the equipment is completely stopped.
· Loosen the locking bolts one by one in a circumferential order.
· Insert the bolts into the removal threaded holes and tighten them evenly.
· When reinstalling, repeat the steps in the "Installation" section.
Precautions
■ Calibration and Adjustment
The tolerances for d1 and d2 are those before slotting.
Eccentricity adjustment has been completed and assembly finished before shipment.
The locking bolt hole of the keyless flange is equipped with a threaded hole for removal. When disassembling, please screw in an M8 bolt.
For installation and removal methods of the keyless type, please refer to
P.815 for confirmation.
The static torsional stiffness constant, moment of inertia, and weight are values for the maximum shaft diameter.
Eccentricity, angular deviation, and axial amplitude are all individual allowable values. If multiple types of deviations occur at the same time, the allowable value for each deviation is reduced to half of the original value.
For selection criteria and calibration adjustment, please refer to P.788·789.
The tolerances for d1 and d2 are those before slotting.Eccentricity adjustment has been completed and assembly finished before shipment.The locking bolt hole of the keyless flange is equipped with a threaded hole for removal. When disassembling, please screw in an M8 bolt.For installation and removal methods of the keyless type, please refer to
P.815 for confirmation.The static torsional stiffness constant, moment of inertia, and weight are values for the maximum shaft diameter.Eccentricity, angular deviation, and axial amplitude are all individual allowable values. If multiple types of deviations occur at the same time, the allowable value for each deviation is reduced to half of the original value.For selection criteria and calibration adjustment, please refer to P.788·789.Example of Use
Related Products
| Economy Coupling Stepped Double Disc Clamp Type | Economy Coupling Single Disc/Double Disc Carbon Steel Keyway Type | Economy Coupling Jaw Type Carbon Steel Clamp Type | ||
 |  |  |
Part Number
CAD Data download and 3D preview are not available because the part number has not yet been determined.
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- Please confirm the part number from "Specification / Dimension"on the left side, and then perform the CAD Data Download / 3D Preview operation.
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| Part Number |
|---|
| E-LDBL02-D65-[14,15,16,17,18,19,20,22,24,25,28,30,32,35]-[14,15,16,17,18,19,20,22,24,25,28,30,32,35] |
| E-LDBL02-D87-[16,17,18,19,20,22,24,25,30,35]-[16,17,18,19,20,22,24,25,30,35] |
| E-LDBL56-D65-[14,15,16,17,18,19,20,22,24,25,28,30,32,35]-[14,15,16,17,18,19,20,22,24,25,28,30,32,35] |
| E-LDBL56-D87-[16,17,18,19,20,22,24,25,30,35]-[16,17,18,19,20,22,24,25,30,35] |
| Part Number | Standard Unit Price | Minimum order quantity | Volume Discount | Days to Ship | Shaft Bore Dia.1 d1 (or d) (Ø) | Shaft Bore Dia. 2 d2 (or d) (Ø) | O.D. (Ø) | Max. Rotational Speed (r/min) | Moment of Inertia (kg・m2) |
|---|---|---|---|---|---|---|---|---|---|
- | 1 Piece(s) | 14 Day(s) | 14 ～ 35 | 14 ～ 35 | 65 | 7000 | 3.6 × 10-4 | ||
- | 1 Piece(s) | 14 Day(s) | 16 ～ 35 | 16 ～ 35 | 87 | 6000 | 1.2×10-3 | ||
- | 1 Piece(s) | 14 Day(s) | 14 ～ 35 | 14 ～ 35 | 65 | 7000 | 7.3 × 10-4 | ||
- | 1 Piece(s) | 14 Day(s) | 16 ～ 35 | 16 ～ 35 | 87 | 6000 | 1.0 × 10-3 |
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Basic Information
| Series Name | Disc | Application | For Servo Motors / Stepping Motor | Features | High Torsional Rigidity / High Torque Type |
|---|---|---|---|---|---|
| Allowable Misalignment | Angular Misalignment / Eccentricity / Axial Misalignment | Max. Rotational Speed Range(r/min) | 4001~10000 | Body Material | Steel |
| Allowable Angular Misalignment(deg) | 0.5 | Product Category | Coupling Main Body | Allowable Lateral Misalignment Range(mm) | 0.02~0.2 |
| Disc Material | Stainless Steel | Allowable Axial Misalignment(mm) | ±0.5 | Single/Double | Single |
Specification/Dimensions
-
Shaft Bore Dia.1 d1 (or d)(Ø)
-
Shaft Bore Dia. 2 d2 (or d)(Ø)
-
O.D.(Ø)
-
Max. Rotational Speed(r/min)
-
type
- E-LDBL02
- E-LDBL56
-
CAD
- 2D
- 3D
Days to Ship
-
- All
- 14 Day(s) or Less
Specify Alterations
- The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .
Frequently asked question (FAQ)
- Question: What is a coupling?
- Answer: A coupling is a component used to connect two different rotating bodies (such as motor shafts or ball screws) for the purpose of transmitting torque. By absorbing shaft misalignment (eccentricity, angular misalignment, axial displacement) between rotating bodies, it reduces the load during assembly and adjustment. In the event of accidental overload, the coupling will break and disconnect the rotating bodies to protect expensive power components and the overall equipment.
- Question: Is there a selection guide provided for the bore sizes at both ends of the product?
-
Answer:
d1, d2 same diameter = d1 + 0.5
d1, d2 different diameters = larger bore diameter + 0.5
· When d1 is 4 or less and d2 is 5 or more, there are 3 set screws.
· When both d1 and d2 are less than 4, there are 2 set screws. - Question: How does the product achieve suitability for eccentricity and angular misalignment in its design?
- Answer: The leaf spring formed by the slit allows for eccentricity, angular misalignment, and end play.
- Question: Which mechanical components is the product suitable for?
- Answer: With zero backlash, it is suitable for applications requiring rotational accuracy.
- Question: What are the requirements for the product's application in terms of eccentricity and angular misalignment?
- Answer: Eccentricity, angular misalignment, and axial amplitude are all individual allowable values. If multiple types of deviations occur at the same time, the allowable value for each deviation is reduced to half of the original value.
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