Attributes

Brand	-
Category	Standard Parts, Components & Industrial Consumables / Couplings
Origin	-
Material	45# Carbon Steel
Coupling Type	Single/Double Diaphragm & Expansion Sleeve
Model Series	DJM, JM, SJM, JMJ, ZJM
Application	High Torque Motor Connections
Surface Treatment	Black Oxide Coating
Misalignment Compensation	Angular, Parallel, and Axial
Operating Temperature	-20°C to +120°C
Transmission Efficiency	>99%
Maintenance Requirement	Lubrication-Free
Customization	Bore Size and Keyway Available

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Perfect for high torque applications

We installed these DJM couplings on our main drive motors last month. The build quality of the 45# steel is excellent, and they handle the high torque without any vibration issues. Highly recommended for industrial use.

Anonymous

Mar 28, 2026

Rating: 4/5

Good value for money

For the price point, you get a very robust coupling. The 45# steel feels heavy and durable. Ensure you measure your shaft tolerance correctly before ordering, as the fit is tight (which is good).

Anonymous

Mar 22, 2026

Rating: 5/5

Solved our alignment issues

Our machinery had slight misalignment problems causing noise. These single diaphragm couplings absorbed the misalignment perfectly, and the plant is now much quieter. Very satisfied with the performance.

Anonymous

Mar 20, 2026

Rating: 4/5

Solid construction, precise fit

The machining precision on the bore was spot on for our shafts. Installation was straightforward. I took off one star only because the delivery took a bit longer than expected, but the product itself is top-notch.

Anonymous

Mar 20, 2026

Rating: 5/5

Great replacement for worn parts

Replaced our old flexible couplings with these double diaphragm JMJ models. The difference in smoothness is noticeable immediately. No lubrication needed is a huge plus for our maintenance team.

Anonymous

Mar 20, 2026

Rating: 5/5

Excellent durability

Running these in a harsh environment with some temperature fluctuations. The ZJM expansion sleeve type has held up perfectly with no signs of wear after three months of continuous operation.

5 FAQ

Q: What is the maximum operating temperature for the 45# steel model?

A: The standard 45# steel diaphragm couplings are rated for continuous operation between -20°C and +120°C. For extreme temperatures, please consult our engineering team.

Q: Is installation difficult? Do I need special tools?

A: Installation is standard for industrial couplings. You will need basic alignment tools and a torque wrench to secure the bolts to the specified tension. No specialized heating or pressing tools are typically required.

Q: Can I customize the bore size and keyway dimensions?

A: Yes, we offer customization for bore sizes and keyways to match your specific motor and equipment shaft requirements. Please contact us with your specifications before ordering.

Q: What is the difference between the SJM and JMJ models?

A: The SJM is a single diaphragm coupling suitable for smaller misalignments, while the JMJ is a double diaphragm coupling designed to accommodate larger parallel and angular misalignments with higher torque capacity.

Q: Does this coupling require regular lubrication?

A: No, the diaphragm design of the JM/DJM series is metal-to-metal and does not require any lubrication, reducing maintenance costs significantly.

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