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Jaw Couplings High Rigidity Double Disc Carbon Steel Keyless Type
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Part Number
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Product Overview
The diaphragm coupling consists of several sets of diaphragms (stainless steel thin plates) that are alternately connected to the two halves of the coupling with bolts. Each set of diaphragms is made up of multiple stacked plates.
The diaphragm coupling compensates for the relative displacement between the two connected shafts through the elastic deformation of the diaphragms. It is a high-performance flexible coupling with strong metal components.
Its features include a compact structure, zero backlash, high strength, long service life, no rotational clearance, unaffected by temperature and oil contamination, and resistance to acid, alkali, and corrosion.
Applicable motor types: Recommended for use with servo motors, stepper motors, and general-purpose motors.
The diaphragm coupling compensates for the relative displacement between the two connected shafts through the elastic deformation of the diaphragms. It is a high-performance flexible coupling with strong metal components.
Its features include a compact structure, zero backlash, high strength, long service life, no rotational clearance, unaffected by temperature and oil contamination, and resistance to acid, alkali, and corrosion.
Applicable motor types: Recommended for use with servo motors, stepper motors, and general-purpose motors.
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 table
| Type | Diaphragm type | Body | Diaphragm |  Accessories | ||
| Keyless on both sides | Keyless on one side |  Material |  Surface treatment | Material | ||
| Keyway hole on one side | ||||||
| E-LDBL07-D | E-LDBL66-D | Double disc type | S45C | Blackened | SUS304 | Locking screw Set screw |
Specification Table
Please follow the selection steps 
to 
, choose the type and parameters, and then place your order. Please specify the shaft bore diameter within the range of d1 ≤ d2.
■ Characteristic Values
The values of static torsional rigidity, moment of inertia, and weight are given for the maximum shaft diameter.
to 
, choose the type and parameters, and then place your order. Please specify the shaft bore diameter within the range of d1 ≤ d2.Type (Type· D) | — |  d1 | — | d2 |
| E-LDBL07-D65 | — | 20 | — | 35 |
| E-LDBL66-D65 | — | 18 | — | 22 |
| Type | d1 and d2 selection (but d1 ≤ d2) | ⌀D1 | L | LF | LP | S | Keyless side locking screw M1 | Removal screw M2 | |||||||||||||||
| Type | D | ||||||||||||||||||||||
| E-LDBL07-D Keyless on both sides | 65 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 58 | 90.8 | 25.8 | 15.8 | 5.7 | M6 | M6 | |
| 87 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 74 | 104 | 28.25 | 19 | 8.5 | M6 | M6 | ||||
| Type | d1 and d2 selection (but d1 ≤ d2) | ⌀D1 | ⌀N | L | LF1 | LF2 | LP | S | Keyway side fixing screw M | Keyless side locking screw M1 | Removal screw M2 | ||||||||||||||||
| Type | D | ||||||||||||||||||||||||||
| E-LDBL66-D | 65 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 58 | 46 | 84 | 25.8 | 24.9 | 15.8 | 5.7 | M6 | M6 | M6 | ||
| 87 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | 28 | 30 | 32 | 35 | 74 | 56 | 100 | 28.25 | 29 | 19 | 8.5 | M8 | M6 | M6 | |||||
■ Characteristic Values
| Type | Permissible torque (N⋅m) | Permissible eccentricity (mm) | 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-LDBL07-D Keyless on both sides | 65 | 210 | 0.2 | 0.5 | ±0.6 | 7000 | 38000 | 8.2 × 10-4 | M6 | 7 | 1250 |
| 87 | 390 | ±1 | 6000 | 50000 | 1.3 × 10-3 | M8 | 15 | 1620 | |||
| Type | Permissible torque (N⋅m) | Permissible eccentricity (mm) | 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-LDBL66-D Keyless on one side · Single-sided keyway hole | 65 | 210 | 0.2 | 0.5 | ±0.6 | 7000 | 38000 | 7.9 × 10-4 | M6 | 7 | 1140 |
| 87 | 390 | ±1 | 6000 | 50000 | 1.0 × 10-4 | M8 | 15 | 1500 | |||
The values of static torsional rigidity, moment of inertia, and weight are given for the maximum shaft diameter.
| 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 |
Product Features
■ Main Features of the Diaphragm Coupling
1. Strong ability to compensate for misalignment between two shafts. Compared to gear couplings, it allows for twice the angular displacement, has lower reaction force during radial displacement, greater flexibility, and permits a certain amount of axial, radial, and angular displacement.
2. Provides significant shock absorption, with no noise and no wear.
3. Can operate safely under conditions of impact and vibration.
4. High transmission efficiency, up to 99.86%. Especially suitable for medium- and high-speed, high-power transmission.
5. Simple structure, lightweight, compact size, and easy to install and remove. Installation and removal can be done without moving the machine (refers to the type with an intermediate shaft), and no lubrication is required.
6. Can accurately transmit rotational speed, operates without slip, and can be used for precision machinery transmission.
1. Strong ability to compensate for misalignment between two shafts. Compared to gear couplings, it allows for twice the angular displacement, has lower reaction force during radial displacement, greater flexibility, and permits a certain amount of axial, radial, and angular displacement.
2. Provides significant shock absorption, with no noise and no wear.
3. Can operate safely under conditions of impact and vibration.
4. High transmission efficiency, up to 99.86%. Especially suitable for medium- and high-speed, high-power transmission.
5. Simple structure, lightweight, compact size, and easy to install and remove. Installation and removal can be done without moving the machine (refers to the type with an intermediate shaft), and no lubrication is required.
6. Can accurately transmit rotational speed, operates without slip, and can be used for precision machinery transmission.
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.
Usage Method
■ Installation method
STEP 1 Insert the coupling
Make sure the clamping bolts are loosened, then remove any dust, foreign matter, or oil from the shaft and the coupling bore.
Next, when inserting the coupling onto the shaft, be careful not to subject the diaphragm to excessive stress such as compression or tension.
STEP 2 Adjustment using a jig
Please use a jig to precisely adjust and secure the concentricity of the left and right hubs of the coupling.
STEP 3 Simple eccentricity and angular misalignment check
With the bolts loosened, slide the coupling axially to confirm smooth operation.
Next, rotate the coupling and make sure it operates smoothly.
Eccentricity is not allowed for single-disc couplings, so please position them accurately.
STEP 4 Installation
Adjust the shaft insertion amount according to the ℓ dimension in the product catalog, and use a torque wrench to tighten to the specified torque.
*If the specified torque cannot be reached in one tightening, please tighten the left and right clamps in a crisscross pattern over 2 or 3 rounds.
STEP 1 Insert the coupling
Make sure the clamping bolts are loosened, then remove any dust, foreign matter, or oil from the shaft and the coupling bore.
Next, when inserting the coupling onto the shaft, be careful not to subject the diaphragm to excessive stress such as compression or tension.
STEP 2 Adjustment using a jig
Please use a jig to precisely adjust and secure the concentricity of the left and right hubs of the coupling.
STEP 3 Simple eccentricity and angular misalignment check
With the bolts loosened, slide the coupling axially to confirm smooth operation.
Next, rotate the coupling and make sure it operates smoothly.
Eccentricity is not allowed for single-disc couplings, so please position them accurately.
STEP 4 Installation
Adjust the shaft insertion amount according to the ℓ dimension in the product catalog, and use a torque wrench to tighten to the specified torque.
*If the specified torque cannot be reached in one tightening, please tighten the left and right clamps in a crisscross pattern over 2 or 3 rounds.
Precautions
■ Alignment Adjustment
1. Couplings allow for shaft misalignment, transmission of rotational angle, and torque, but if the shaft misalignment exceeds the allowable value, vibration may occur or the service life may be drastically reduced.
Be sure to perform alignment adjustment.
2. Shaft misalignment includes eccentricity (parallel error between two shaft centers), angular misalignment (angular error between two shaft centers), and axial displacement (axial movement of the shaft).
Please calibrate and adjust the shafts to ensure that the shaft misalignment is within the allowable values specified in the dimensions and performance tables of each product.
3. The allowable values for shaft misalignment listed in the dimensions and performance tables refer to the case where only one of eccentricity, angular misalignment, or axial displacement occurs individually. When two or more types of shaft misalignment occur simultaneously, the corresponding allowable values should each be halved.
4. Shaft misalignment does not only occur during assembly to the equipment; vibration during operation, thermal expansion, and bearing wear are also major causes. Therefore, it is recommended to set the shaft misalignment to less than one-third of the allowable value.
1. Couplings allow for shaft misalignment, transmission of rotational angle, and torque, but if the shaft misalignment exceeds the allowable value, vibration may occur or the service life may be drastically reduced.
Be sure to perform alignment adjustment.
2. Shaft misalignment includes eccentricity (parallel error between two shaft centers), angular misalignment (angular error between two shaft centers), and axial displacement (axial movement of the shaft).
Please calibrate and adjust the shafts to ensure that the shaft misalignment is within the allowable values specified in the dimensions and performance tables of each product.
3. The allowable values for shaft misalignment listed in the dimensions and performance tables refer to the case where only one of eccentricity, angular misalignment, or axial displacement occurs individually. When two or more types of shaft misalignment occur simultaneously, the corresponding allowable values should each be halved.
4. Shaft misalignment does not only occur during assembly to the equipment; vibration during operation, thermal expansion, and bearing wear are also major causes. Therefore, it is recommended to set the shaft misalignment to less than one-third of the allowable value.
Example of Use
 Coupling Example of Use 1: Motor × Gearbox |  Coupling Example of Use 2: Motor × Ball Screw |
 Coupling Example of Use 3: Motor × Encoder |  Coupling Example of Use 4: Motor × Testing Machine |
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.
- *In order to open the CAD Data download and 3D preview screen, the part number must be fixed.
- 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-LDBL07-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-LDBL07-D87-[16,17,18,19,20,22,24,25,30,35]-[16,17,18,19,20,22,24,25,30,35] |
| E-LDBL66-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-LDBL66-D87-[16,17,18,19,20,22,24,25,28,30,32,35]-[16,17,18,19,20,22,24,25,28,30,32,35] |
| 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) | Allowable Axial Misalignment (mm) | Moment of Inertia (kg・m2) | Shaft Hole Shape |
|---|---|---|---|---|---|---|---|---|---|---|---|
- | 1 Piece(s) | 14 Day(s) | 14 ～ 35 | 14 ～ 35 | 65 | 7000 | ±0.6 | 8.2 × 10-4 | Both Sides Keyless | ||
- | 1 Piece(s) | 14 Day(s) | 16 ～ 35 | 16 ～ 35 | 87 | 6000 | ±1 | 1.3×10-3 | Both Sides Keyless | ||
- | 1 Piece(s) | 14 Day(s) | 14 ～ 35 | 14 ～ 35 | 65 | 6000 | ±0.6 | 7.9 × 10-4 | Keyless on one side, keyway on the other side | ||
- | 1 Piece(s) | 14 Day(s) | 16 ～ 35 | 16 ～ 35 | 87 | 7000 | ±1 | 1.4×10-4 | Keyless on one side, keyway on the other side |
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Basic Information
| Series Name | Disc | Application | For Servo Motors / Stepping Motor | Features | High Torsional Rigidity / High Torque Type / Zero Backlash |
|---|---|---|---|---|---|
| Allowable Misalignment | Angular Misalignment / Eccentricity / Axial Misalignment | Max. Rotational Speed Range(r/min) | 4001~10000 | Body Material | Steel |
| Allowable Angular Misalignment(deg) | 0.5 | Allowable Lateral Misalignment(mm) | 0.2 | Product Category | Coupling Main Body |
| Allowable Lateral Misalignment Range(mm) | 0.02~0.2 | Disc Material | Stainless Steel | Single/Double | Double |
| Shaft Tightening Method | Set screw, stop screw |
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)
-
Shaft Hole Shape
- Both Sides Keyless
- Keyless on one side, keyway on the other side
-
type
- E-LDBL07
- E-LDBL66
-
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: What types of couplings does MISUMI offer?
- Answer: There are disc type, slit type, cross type, jaw type, bellows type, rigid type, and universal joint type.
- Question: How do you select a coupling based on the motor?
- Answer: Disc type is recommended for servo motors, slit type for stepper motors, and cross type for general-purpose motors.
- Question: How do you select based on application, environment, or operating conditions?
- Answer: Please refer to the linked webpage for detailed information. https://www.misumi.com.cn/special/coupling/select/situation/
- Question: Which type of coupling should be used when the misalignment angle is very large?
- Answer: Please select a universal joint that allows a misalignment angle of 30°. In addition, if regular application of grease is not possible, please use a rubber boot, fill it with grease, and use accordingly.
- Question: Which is better for disc couplings: single-disc type or double-disc type?
-
Answer:
The double-disc type can absorb angular and parallel misalignment, but the overall length will be longer.
Although the single-disc type has a shorter overall length, its structure does not allow for parallel misalignment, so it is only suitable for use in confined spaces and requires special attention to centering during installation. - Question: How much of the shaft should be inserted into the coupling during installation?
- Answer: Please select the length of the main body (coupling section) as specified in the product catalog. If the insertion depth is too short, it may cause the shaft to slip or damage the clamping section; if it is too long, interference between the shafts inside the coupling may cause damage.
- Question: Why is it necessary to install a protective cover around the coupling?
- Answer: Because it operates at high speeds, accidental contact may cause injury or result in gloves, towels, and similar items getting caught. In addition, for various reasons, it may also cause parts to be damaged or debris to scatter. Therefore, be sure to install a safety cover.
- Question: What should I do if there is no matching shaft bore size?
- Answer: Please select a product that allows for adjustable keyway width or keyway machining. MISUMI products include the MCSLCWK series (disc type), CPOC series (cross type), and MMJN series (jaw type), among others.
- Question: Is it a defect if there are differences in the groove clearance width?
- Answer: Since the differences are within the dimensional tolerance range, there is no problem.
Additional Products in this Category
- Disc Couplings - High Rigidity (O.D. 65), Keywayed Bore / Clamping, for Servo Motors
- Oldham Couplings - Spacers (for MFJ/MFJC)
- Oldham Couplings - Clamping / Set Screw - Spacers (for CPO, CPOC, CPOCG)
- Slit Couplings Long, Clamping Type
- Star FlexALS-Y
- Super zero Oldham coupling series CCZ type aluminum alloy products
- Disc Coupling Clamping Type (Double Disc) SDW
- Flexible Coupling (Clamping) EA969BA-2
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