Attributes

Brand	-
Category	Standard Parts, Components & Industrial Consumables / Couplings
Origin	-
Material	45# Carbon Steel
Coupling Type	YLD Back-to-Back Wheel
Flange Outer Diameter	120 mm
Flange Profile	Concave/Convex Matched Pair
Application	Motor to Reducer Connection
Surface Treatment	Black Oxide Coating
Torque Capacity	High Torque Transmission
Mounting Style	Bolted Flange Connection
Compatibility	Standard Industrial Motors
Package Contents	2 Flange Halves, Mounting Bolts

6 reviews

Anonymous

Mar 21, 2026

Rating: 5/5

Excellent precision

As a maintenance engineer, I appreciate the precision of the flange faces. The contact area is uniform which ensures even load distribution. Highly recommended for motor to gearbox applications.

Anonymous

Mar 19, 2026

Rating: 5/5

Reliable and durable

Been running this coupling in a high-cycle packaging machine for three months now. No signs of wear or loosening. The steel feels very robust and the finish resists oil well.

Anonymous

Mar 14, 2026

Rating: 5/5

Perfect fit for our conveyor system

The machining quality on these flanges is excellent. The concave and convex sides matched perfectly without any need for shimming. Installed them on a motor-reducer setup and vibration is minimal.

Anonymous

Mar 13, 2026

Rating: 4/5

Good product, fast shipping

The coupling arrived quickly and was packaged securely. Dimensions match the spec sheet exactly. Installation was straightforward. Would have preferred if it came with a torque specification sheet included.

Anonymous

Mar 07, 2026

Rating: 4/5

Solid steel construction

Very heavy duty coupling made from genuine 45# steel. The bolt holes were aligned precisely. Only giving 4 stars because the black coating had a few minor scratches upon arrival, but nothing that affects performance.

Anonymous

Mar 04, 2026

Rating: 5/5

Great value for industrial use

We replaced an old worn-out coupling with this YLD model. The 120mm diameter fits our standard housing perfectly. It handles the torque load smoothly and the back-to-back design makes alignment much easier.

5 FAQ

Q: Can this be used in an outdoor environment?

A: While the black oxide coating offers some rust resistance, we recommend additional protective measures or regular maintenance if installed in harsh outdoor or wet conditions.

Q: What is the maximum RPM rating for this YLD coupling?

A: For a 120mm 45# steel YLD coupling, the typical safe operating speed is up to 3000 RPM, depending on the specific load and balance requirements of your application.

Q: Is the bore size pre-machined or do I need to specify it?

A: This item is sold as a flange connector with standard pilot diameters. You will need to machine the final bore and keyway to match your specific motor and reducer shaft sizes.

Q: Does this coupling come with the necessary bolts for installation?

A: Yes, the package includes a set of high-strength mounting bolts suitable for the 120mm flange diameter.

Q: Are replacement rubber spiders available for this model?

A: This specific YLD Back-to-Back Wheel design is a rigid metallic coupling and does not utilize rubber spiders or flexible elements.

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