Flange Coupling Steel Shaft 4mm Bore

High-precision rigid flange coupling designed to connect two 4mm shafts in motor-driven applications, robotics, and mechanical power transmission systems. This steel flange coupler provides a solid, zero-backlash connection between motor shafts and driven components, ensuring accurate torque transfer and precise rotational alignment. The rigid design maintains angular alignment and eliminates play between coupled shafts, making it ideal for applications requiring positional accuracy.

Manufactured from durable steel with precision-machined bore holes and mounting flanges, this coupling provides reliable performance in DIY projects, CNC machines, 3D printers, and robotic assemblies. Each flange features multiple mounting holes for secure attachment using M3 or M4 screws. Set screws on both sides lock shafts firmly in place, preventing slippage under load. The compact design minimizes added length to shaft assemblies while maintaining high torque capacity. Perfect for connecting stepper motors, DC motors, encoders, and other rotary devices requiring solid shaft-to-shaft connections.

Specifications:

• Product Type: Rigid Flange Coupling (Shaft Coupler)
• Bore Diameter: 4mm (both sides)
• Material: Steel
• Coupling Style: Rigid (zero-backlash)
• Outer Diameter: 20-25mm (typical, varies by design)
• Overall Length: 25-30mm (typical)
• Flange Thickness: 3-5mm (typical)
• Flange Diameter: 18-22mm (typical)
• Mounting Holes: 4-6 holes for M3/M4 screws
• Mounting Hole Pattern: Circular pattern (typically on 15-18mm PCD)
• Set Screw Type: Grub screws (hex socket)
• Number of Set Screws: 2 per side (4 total) or 1 per side (2 total)
• Torque Capacity: 1-2 N⋅m (depending on shaft material and set screw tightness)
• Maximum RPM: 5000+ RPM (depends on balance and shaft quality)
• Misalignment Tolerance: Minimal (rigid coupling, requires precise alignment)
• Applications: Robotics, CNC machines, 3D printers, motor shaft connections, encoder mounting