Specs/CAD

mm inch

Part Number	Max. Bore Diameter (mm)	Rated Torque＊1 (N・m)Rated Torque＊1 (lbf in.)	Max. Torque (N・m)＊1Max. Torque (lbf in.)＊1	Max. Rotational Frequency (min-1)	Moment of Inertia (kg・m2)＊2Moment of Inertia (oz. in.2)＊2	Static Torsional Stiffness (N･m/rad)Static Torsional Stiffness (lbf in./deg)	Max. Lateral Misalignment (mm)Max. Lateral Misalignment (in.)	Max. Angular Misalignment (°)	Max. Axial Misalignment (mm)Max. Axial Misalignment (in.)	Sleeve Hardness	Mass (g) ＊2Mass (oz) ＊2
MJB-40-BL	20	4.943.37	9.886.73	23000	8.6×10-54.702	38058.69	0.150.006	1	0～+1.20～+0.047	A80	40014.11
MJB-55-BL	28	17150.45	34300.9	17000	3.7×10-420.23	1400216.24	0.20.008	1	0～+1.40～+0.055	A80	80028.22
MJB-65-BL	38	46407.1	92814.2	14000	8.0×10-443.74	2800432.49	0.20.008	1	0～+1.50～+0.059	A80	110038.8
MJB-80-BL	45	95840.75	1901681.5	11000	2.5×10-3136.687	3200494.27	0.20.008	1	0～+1.80～+0.071	A80	230081.12
MJB-95-BL	50	1301150.5	2602301	10000	5.4×10-3295.244	3600556.06	0.20.008	1	0～+2.00～+0.079	A80	4000141.08

＊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 following table.

The allowable operating temperature of MJB is -20°C to 60℃.

※ The shaft's slip torque may be smaller than the coupling's rated torque depending on the shaft bore. MJB-BLMJB-GRMJB-RDMJB-WHMJB-EBLMJB-EGRMJB-ERD

＊2：　These are values with max. bore diameter.

Part Number	Standard Bore Diameter D1･D2
	8	9.525	10	11	12	14	15	16	18	19	20	22	24	25	28	30	32	35	38	40	42	45	48	50
MJB-40-BL	●	●	●	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
MJB-55-BL	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
MJB-65-BL	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●	●	-	-	-	-	-
MJB-80-BL	-	-	-	-	-	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	-	-
MJB-95-BL	-	-	-	-	-	-	-	-	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●

● All products are provided with hex socket head cap screw.
● Recommended tolerance for shaft diameters is h6 and h7.

Ambient Temperature / Temperature Correction Factor

Slip torque

As in the table below, the bushing type MJB has different slip torque according to the bore diameter. Take care during selection.

Structure

Bushing Type

MJB MJB-BL MJB-GR MJB-RD MJB-WH MJB-EBL MJB-EGR MJB-ERD MJB-EWH

Sleeve

Material/Finish

Characteristics

• Recommended Applicable Motor

• Property

• This is a jaw type flexible coupling.
• Excellent for high torque transmission and ideal for machine tool spindles.
• Excellent flexibility. 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.
• Since the sleeve's vibration absorption of Tight Fit can raise the gain of a servomotor, this unit can achieve high responsive operation exceeding the Disk coupling.
• Easy fit allows you to assemble and partition the hub and sleeve smoothly.
  This allows you to reduce the time of assembling the unit and maintenance.

• Sleeve Type

Application

Machine tool / Spindle

Selection

Selection Based on Shaft Diameter and Rated Torque

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

Selection Example

In case of selected parameters of shaft diameter of φ 18 and load torque of 16 N•m, the selection size forMJB-＊＊-BLMJB-＊＊-EBLis MJB-55-BLMJB-55-EBL

Eccentric Reaction Force

Sleeve Details

Change in static torsional stiffness due to temperature

This is a value under the condition where the static torsional stiffness at 20°C is 100%.
Changes in the static torsion spring constant within the operating temperature are shown in the graph.
Before using the unit, be aware of the deterioration of responsiveness.