Attributes

Brand	-
Category	Standard Parts, Components & Industrial Consumables / Couplings
Origin	-
Material	Aluminum Alloy
Outer Diameter	20mm
Length	25mm
Coupling Type	Rigid
Application	Engraving Machines, CNC Routers
Compatible Motors	Stepper and Servo Motors
Connection Method	Set Screw
Max Torque Capacity	High-Torque Design
Surface Finish	Anodized Black
Package Contents	1 x Rigid Coupling, 4 x Set Screws

6 reviews

Anonymous

Mar 28, 2026

Rating: 4/5

Good quality, precise dimensions

The D20L25 specs are accurate. It connected my stepper motor to the lead screw seamlessly. Only minor issue was one screw was slightly tight, but overall great value.

Anonymous

Mar 22, 2026

Rating: 5/5

Durable and reliable

Been running this on my machine for three months now with heavy use. No signs of wear or loosening. Highly recommend for hobbyist CNC projects.

Anonymous

Mar 18, 2026

Rating: 5/5

Great replacement part

Fast shipping and the product matches the description perfectly. Easy to install and aligns the motor shaft perfectly with the lead screw.

Anonymous

Mar 17, 2026

Rating: 5/5

Excellent rigidity

Exactly what I needed for a direct drive setup. The rigid design ensures zero backlash, which improved my engraving precision significantly.

Anonymous

Mar 12, 2026

Rating: 5/5

Perfect fit for my CNC upgrade

This rigid coupling replaced a worn-out part on my engraver. The aluminum alloy feels sturdy, and the set screws held tight under high torque. No wobble at all.

Anonymous

Mar 09, 2026

Rating: 4/5

Solid construction

Well-machined part. The anodized finish looks professional. It handles the torque from my servo motor without any issues.

5 FAQ

Q: Is the inner bore exactly 20mm or is there tolerance?

A: The bore is machined to H7 tolerance, ensuring a precise fit for 20mm shafts while allowing for standard mechanical assembly.

Q: Does this coupling work with a NEMA 23 motor?

A: Yes, as long as the motor shaft diameter is 20mm or can be adapted to fit the 20mm bore using a reducer bushing.

Q: Can this be used for flexible connections?

A: No, this is a rigid coupling designed for precise alignment. If you need to compensate for misalignment, please consider our flexible jaw or bellows couplings.

Q: What is the maximum RPM this coupling can handle?

A: While specific RPM limits depend on balance and application, this rigid aluminum coupling is generally suitable for speeds up to 4000 RPM in standard engraving applications.

Q: Are the set screws included in the package?

A: Yes, the package includes four set screws required for installation.

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