Attributes

Brand	-
Category	Standard Parts, Components & Industrial Consumables / Couplings
Origin	-
Material	45# Carbon Steel
Coupling Type	Single/Double Diaphragm (JMJ/DJM)
Connection Method	Shrink Fit / Keyway
Torque Capacity	High Torque Transmission
Precision Level	High Precision Balanced
Operating Temperature	-30°C to +120°C
Surface Treatment	Black Oxide Coating
Misalignment Compensation	Angular, Parallel, and Axial
Maintenance Requirement	Maintenance Free
Application	Servo Motors, Pumps, Compressors

6 reviews

Anonymous

Mar 28, 2026

Rating: 5/5

Great replacement part

Replaced an old worn-out coupling with this JMJ model. The dimensions matched perfectly, and the diaphragm design allows for slight misalignments which saved us from re-aligning the entire setup.

Anonymous

Mar 20, 2026

Rating: 5/5

Excellent torsional stiffness

Needed a coupling with high torsional stiffness for a robotics project. This double diaphragm version performs flawlessly. No play, smooth operation, and very durable.

Anonymous

Mar 20, 2026

Rating: 5/5

Reliable industrial component

We purchased several units for our packaging machinery. They have been running 24/7 for three months without any issues. The high precision claim holds true in our testing.

Anonymous

Mar 15, 2026

Rating: 5/5

Perfect for high-speed applications

Installed this DJM coupling on our CNC spindle motor. The balance is excellent, and there is zero vibration even at high RPMs. The shrink fit installation was straightforward with the right tools.

Anonymous

Mar 14, 2026

Rating: 4/5

Good value for money

For the price, this is a very capable coupling. The finish is good, and it transmits power efficiently. Just ensure you follow the torque specs carefully during installation.

Anonymous

Mar 11, 2026

Rating: 4/5

Solid build quality

The 45 steel construction feels very robust. We use it to connect a servo motor to a lead screw. It handles the torque well without any backlash. Deducting one star only because the delivery took slightly longer than expected.

5 FAQ

Q: Is the material stainless steel?

A: No, the primary material is 45# Carbon Steel with a black oxide finish. The diaphragm itself is typically made from high-strength stainless steel for fatigue resistance.

Q: Can this handle axial movement?

A: Yes, the single and double diaphragm designs are specifically engineered to compensate for axial, angular, and parallel misalignments.

Q: Does this coupling require lubrication?

A: No, the diaphragm design is maintenance-free and does not require any lubrication during its service life.

Q: How do I install the shrink fit version?

A: Installation requires heating the coupling hub or cooling the shaft to achieve the interference fit. Please follow standard thermal expansion procedures and safety guidelines.

Q: What is the maximum bore size available for the JMJ series?

A: The maximum bore size depends on the specific model number within the JMJ series. Please refer to the detailed dimension chart or contact us with your shaft diameter for a recommendation.

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