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Flexible Coupling - Jaw-Type - Set Screw + Key Type

MJC-K-EWH

Dimension Drawing

MJC-K-EWHFlexible Coupling - Jaw-Type - Set Screw + Key Type寸法図

MJC-K-EWHFlexible Coupling - Jaw-Type - Set Screw + Key Type寸法図

MJC-K-EWHFlexible Coupling - Jaw-Type - Set Screw + Key Type寸法図

Specs/CAD

Part Number ALWBC*1FEM Wrench
Torque
(N・m)
Standard bore diameter
D1-D2
Price
(USD)
CAD
Download
Add to Cart
MJC-25K-EWH 25 12 34 8 1 6 8 M4 1.7 - 55.22 CAD Cart
MJC-30K-EWH 30 11 35 10 1.5 5.5 10 M4 1.7 - 68.66 CAD Cart
MJC-40K-EWH 40 25 66 12 2 12.5 17 M5 4 - 82.61 CAD Cart
MJC-55K-EWH 55 30 78 14 2 15 26 M6 7 - 143.65 CAD Cart
MJC-65K-EWH 65 35 90 15 2.5 17.5 29.5 M8 15 - 193.10 CAD Cart
MJC-80K-EWH 80 45 114 18 3 22.5 35.5 M8 15 - 382.20 CAD Cart
MJC-95K-EWH 95 50 126 20 3 25 44 M8 15 - 597.36 CAD Cart

*1: Use with C Dimension

Part Number Max. Bore Diameter
(mm)
Rated
Torque*1
(N・m)
Max.
Torque*1
(N・m)
Max.
Rotational
(min-1)
Moment
of
Inertia*2
(Kg・m2)
Static
Torsional
Stiffness
(N・m/rad)
Max. Lateral Misalignment
(mm)
Max. Angular Misalignment
(°)
Max. Axial Misalignment
(mm)
Sleeve Hardness Mass*2
(g)
MJC-25K-EWH 12.7 5 10 25000 3.2×10-6 60 0.15 1 0~+0.9 A92 33
MJC-30K-EWH 16 7.5 15 21000 6.1×10-6 73 0.15 1 0~+ 1.0 A92 43
MJC-40K-EWH 25 10 20 15000 3.6×10-5 570 0.1 1 0~+ 1.2 A92 130
MJC-55K-EWH 32 35 70 11000 1.6×10-4 1600 0.15 1 0~+ 1.4 A92 310
MJC-65K-EWH 38.1 95 190 9000 3.6×10-4 3000 0.15 1 0~+ 1.5 A92 510
MJC-80K-EWH 45 190 380 7000 1.1×10-3 5300 0.15 1 0~+ 1.8 A92 1000
MJC-95K-EWH 55 265 530 6000 2.3×10-3 6200 0.15 1 0~+ 2.0 A92 1500

*1: Correction of rated torque and max. torque due to load fluctuation is not required.However, if ambient temperature exceeds 30°C, be sure to correct the rated torque and max. torque with temperature correction factor shown in the table.MJC-K's allowable operating temperature is -20°C to 60°C.
*2: These are values with max. bore diameter.

Part Number Standard Bore Diameter (dimensional allowance H8)
D1・D2
10 11 12 14 15 16 18 19 20 22 24 25 28 30 32 35 38 40 42 45 48 50 55
MJC-25K-EWH
MJC-30K-EWH
MJC-40K-EWH
MJC-55K-EWH
MJC-65K-EWH
MJC-80K-EWH
MJC-95K-EWH

Part Number Standard Bore Diameter (dimensional allowance H7)
D1・D2
1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4
MJC-25K-EWH
MJC-30K-EWH
MJC-40K-EWH
MJC-55K-EWH
MJC-65K-EWH
MJC-80K-EWH
MJC-95K-EWH

●All products are provided with hex socket set screw.
●Recommended dimensional allowances of applicable shaft diameter are h6 and h7.
●A set of hubs with set screw type for one side and clamping type or other type for the other side is available upon request.
●For the shaft insertion amount to the coupling, see Mounting/maintenance. ⇒Mounting and Maintenance

Ambient Temperature / Temperature Correction Factor

Ambient Temperature Temperature Correction Factor
-20℃ to 30℃ 1.00
30℃ to 40℃ 0.80
40℃ to 60℃ 0.70

Structure

Set Screw Type MJC-BLMJC-WHMJC-RDMJC-GRMJC-EBLMJC-EWHMJC-ERDMJC-EGR

MJC-**-**Tight Fit
MJC-**-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Clamping Type MJC-CS-BLMJC-CS-WHMJC-CS-RDMJC-CS-GRMJC-CS-EBLMJC-CS-EWHMJC-CS-ERDMJC-CS-EGR

MJC-**CS-**Tight Fit
MJC-**CS-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Set Screw + Key Type MJC-K-BLMJC-K-WHMJC-K-RDMJC-K-GRMJC-K-EBLMJC-K-EWHMJC-K-ERDMJC-K-EGR

MJC-**K-**Tight Fit
MJC-**K-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Clamping + Key Type MJC-CSK-BLMJC-CSK-WHMJC-CSK-RDMJC-CSK-GRMJC-CSK-EWHMJC-CSK-ERDMJC-CSK-EGR

MJC-**CSK-**Tight Fit
MJC-**CSK-E**Easy Fit

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Sleeve

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type


Material/Finish

MJC-K-EWH
Hub A2017
Anodized*1
Sleeve Polyurethane
Hex Socket Set Screw SCM435
Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)

*1: With regard to bore and keyway surface treatment, process needs may result in a mixture of parts with and without surface treatment. This will not lead to any issues in terms of coupling performance.


Characteristics

  • Applicable motors
Tight Fit Easy Fit
Servomotor
Stepping Motor
General-Purpose Motor

◎: Excellent ○: Very good

  • Property
Tight Fit Easy Fit
Zero Backlash -
High Torque
Allowable Misalignment
Vibration Absorption
Electrical Insulation
Assembling
Allowable Operating
Temperature
-20℃ to 60℃ -20℃ to 60℃

◎: Excellent ○: Very good

  • This is a jaw type flexible coupling.
  • Tight Fit enables transmission with zero backlash at low torque.
  • Easy fit allows you to assemble and partition the hub and sleeve smoothly.
  • Excellent flexibility allows eccentricity, angular misalignment and twisting vibration to be accepted.
  • It has electrical insulation. Resistance value: Not less than 2 MΩ
  • There are four types of sleeve hardness. Please select desirable units according to usage conditions including torque and misalignment.
  • Sleeve Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type


Selection

Selection based on shaft diameter and rated torque

The area bounded by the shaft diameter and rated torque indicates is the selection size.

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

MJC-BL/MJC-WH//MJC-CSK-EGR_CFlexible Coupling - Jaw-Type

Selection Example

In case of selected parameters of shaft diameter of φ15 and load torque of 6 N•m, the selected size for MJC-**-RD, MJC-**-ERD is MJC-30-RD, MJC-30-ERD.

Selection based on the rated output of the servomotor

Rated Output
(W)
Servomotor Specifications Selection Outside Diameter Size
Diameter of Motor Shaft
(mm)
Rated Torque
(N・m)
Instantaneous Max. Torque
(N・m)
MJC-**-BL
MJC-**-EBL
MJC-**-WH
MJC-**-EWH
MJC-**-RD
MJC-**-ERD
MJC-**-GR
MJC-**-EGR
10 5-6 0.032 0.096 14 14 14 14
20 5-6 0.064 0.19 14 14 14 14
30 5-7 0.096 0.29 14 14 14 14
50 6-8 0.16 0.48 20 20 20 20
100 8 0.32 0.95 20 20 20 20
200 9-14 0.64 1.9 30 30 30 30
400 14 1.3 3.8 30 30 30 30
750 16-19 2.4 7.2 - 40 40 40

Motor specifications are based on general values.For details, see the motor manufacturer's catalogs.This is the size for cases where devices such as reduction gears are not used.

Selection Example

In case of motor specification of shaft diameter of φ14 and rated torque of 0.64 N•m, the selected size of MJC-**-BL is as follows.
Set Screw Type ----MJC-30-BL
Clamping Type ----MJC-30CS-BL
Set Screw + Key Type ----MJC-30K-BL
Clamping + Key Type ----MJC-30CSK-BL

Details of Shaft Hole

MJC-K-EWHFlexible Coupling - Jaw-Type - Set Screw + Key Type

Standard Bore Diameter
D
Keyway Key
b t Nominal Dimension
b x h
Standard
Dimension
Allowance
(JS9)
Standard
Dimension
Allowance
10・11・12 4 ±0.0150 1.8 0 to +0.1 4×4
14・15・16 5 ±0.0150 2.3 0 to +0.1 5×5
18・19・20・22 6 ±0.0150 2.8 0 to +0.1 6×6
24・25・28・30 8 ±0.0180 3.3 0 to +0.2 8×7
32・35・38 10 ±0.0180 3.3 0 to +0.2 10×8
40・42 12 ±0.0215 3.3 0 to +0.2 12×8
45・48・50 14 ±0.0215 3.8 0 to +0.2 14×9
55 16 ±0.0215 4.3 0 to +0.2 16×10

MJC-K-EWHFlexible Coupling - Jaw-Type - Set Screw + Key Type

Unit : inch

Standard Inch Bore
Diameter
D
Keyway
Wk T
Standard
Dimension
Allowance Standard
Dimension
Allowance
1/2 1/8 0~+0.002 0.560 0~+0.01
9/16 1/8 0~+0.002 0.623 0~+0.01
5/8 3/16 0~+0.002 0.709 0~+0.01
11/16 3/16 0~+0.002 0.773 0~+0.01
3/4 3/16 0~+0.002 0.837 0~+0.01
13/16 3/16 0~+0.002 0.900 0~+0.01
7/8 3/16 0~+0.002 0.964 0~+0.01
15/16 1/4 0~+0.002 1.051 0~+0.01
1 1/4 0~+0.002 1.114 0~+0.01
11//8 1/4 0~+0.002 1.241 0~+0.01
11//4 1/4 0~+0.002 1.367 0~+0.01
13//8 5/16 0~+0.002 1.518 0~+0.01
11//2 3/8 0~+0.002 1.669 0~+0.01
15//8 3/8 0~+0.002 1.796 0~+0.01
13//4 3/8 0~+0.002 1.922 0~+0.01

Eccentric Reaction Force

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information


Sleeve Details

MJC-K-EWHFlexible Coupling - Jaw-Type - Set Screw + Key Type


Easy Fit

This unit allows you to easily assemble and partition the hub and sleeve. This allows you to reduce the time of assembling the unit and maintenance.It is possible to mount a hub on the shaft in advance and easily assemble the unit even in a location where the coupling is less-visible.

Tight Fit

The hub and sleeve are press-fit and can be used under zero backlash*1.Since the sleeve's vibration absorption can raise the gain of a servomotor, this unit can achieve high responsive operation exceeding the Disk coupling.

*1: For the torque used under zero backlash, please refer to dimensional table.


Change in static torsional stiffness due to temperature

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

MJC-BL/MJC-WH//MJC-CSK-EGR_TTechnical Information

This is a value under the condition where the static torsional stiffness at 20°C is 100%.
The change of torsional stiffness within the range of allowable operating temperature is as shown in the graph.
Before using the unit, be aware of the deterioration of responsiveness.

Related Services

Product List

MJC-40K-EWH

MJC-55K-EWH

MJC-65K-EWH

MJC-80K-EWH

MJC-95K-EWH

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