6Pcs 4Mm To 4Mm Bore Rigid Coupling Stepper Motor Wheel Coupler, Red

High-precision Transmission: This rigid coupling features a one-piece structure, providing precise shaft alignment and reliable rigid torque transmission for models or miniature devices requiring high transmission accuracy. It ensures synchronized rotation of the motor shaft and drive shaft, effectively preventing vibration and breakage caused by misalignment.Wide Applications: The 4mm to 4mm inner bore provides a solution for enthusiasts seeking personalized assembly. It can connect shafts of different diameters without additional adapters. Commonly used in 3D printers, remote-controlled cars, CNC engraving machines, laser engraving machines, small robots, ship models, and other automated equipment requiring secure shaft connections.Stable Fastening: This motor wheel coupler uses 180° arranged double M4 set screws. Its compact size (12mm OD, 20mm length) provides strong grip within limited space, ensuring a stable connection and providing balanced clamping force to firmly secure the shaft even under high torque operation.Excellent Material: This stepper motor coupling is made of aluminum alloy with an anodized finish, making it lightweight and corrosion-resistant. This reduces rotational inertia, enabling rapid power transmission and low rotational inertia, which is particularly beneficial for precision drive systems, enhancing equipment response speed and performance.Easy Installation: Featuring a side-mounted screw design, simply use the included wrench and screws (includes 30 screws and 1 wrench) to align with the shaft and tighten for quick and easy installation. Please note that during installation, ensure the motor shaft and drive shaft are aligned. If the hole is tight, do not force it or strike it, as this may cause deformation or damage.