4Pcs Shaft Coupler 6mm to 8mm Rigid Screw Coupling, 45# Steel Coupler Rigid Couplings for 3D Printers Motor Accessories

["Premium 45# Steel Material: This rigid shaft coupling is constructed from high-quality 45# steel, a high-strength iron-based alloy that is harder and more durable than ordinary iron. It features excellent wear resistance, stable performance, and a long service life, making it ideal for heavy-duty mechanical transmission applications.","90° Fastening Design with 32 Set Screws: Adopting a 90-degree fastening structure, this rigid coupling is equipped with 32 set screws for dual-axis locking. The secure clamping design ensures tight and stable connection between shafts, effectively preventing slipping and ensuring reliable torque transmission during operation.","Precision Machining & Standard Specifications: You will get 4 pcs Bore Rigid Coupling. Each coupling connection diameter: 6mm to 8mm, Total Length: 35mm/1.38\", Outside Diameter: 14mm/0.55\". It adopts a through‑hole design, with each bore length accounting for half of the total coupling length. The bore diameter tolerance is within 0.05mm, suitable for high‑precision equipment.","Outstanding Transmission Performance: This rigid coupler delivers high torque transmission, great rigidity, low inertia and high sensitivity. It provides stable and efficient power transfer, making it widely compatible with motors, hardware tools, molds, and various mechanical transmission systems.","Wide Application & Important Note: Suitable for CNC machines, 3D printers, stepper motors, blowers, DIY robots, gearboxes and other mechanical equipment. Important note: rigid couplings do not allow eccentricity; please make full adjustments during installation to ensure optimal performance and operational stability"]