Double Pass Brass Universal Adapter Coupling 3mm x 3mm

Double Pass Brass Universal Adapter Coupling 3mm × 3mm – Shaft Connector 5mm

This shaft connector 5mm alternative is engineered for precise 3mm-to-3mm shaft joining in compact mechanisms. Its brass body ensures smooth torque delivery and works well in setups where builders also require reliable electric motor to pump coupler alignment or compact wheel coupling assemblies. The Double Pass brass adapter coupling 3mm × 3mm provides stable rotation when both shafts share accurate alignment, making it ideal for miniature robotic systems and prototype motion modules.

After inserting each shaft into the dedicated bore, the included M3 holding screws tighten firmly to prevent slipping. With its rigid structure, this shaft connector 5mm substitute delivers consistent rotational performance, especially in RC power units, model gear trains, and mechanical experiments requiring highly uniform drive transfer.

Technical Details

• Material: Brass
• Bore Sizes: 3mm and 3mm
• Total Length: 20 mm
• Outer Diameter: 9 mm
• Fastening Hardware: M3 holding screws (4 pcs)
• Coupler Type: Rigid straight sleeve
• Weight: 8 g
• Color Finish: Brass gold tone

Features

• Equal-diameter coupling for 3mm drive shafts
• Stable rotational load connection ideal for wheel coupling configurations
• Brass machining enhances durability and oxidation resistance
• Four-point clamp improves grip and alignment security
• Compact design suits electric motor to pump coupler layouts

Applications

• Robotics drivetrains using a shaft connector 5mm substitute
• RC spindle links and wheel coupling mechanisms
• Prototype torque delivery experiments
• Instrumentation drive alignment systems
• Compact electric motor to pump coupler testing platforms

Physical Attributes

• Coupler Length: 20 mm
• Cylinder Diameter: 9 mm
• Bore Dimensions: 3 mm and 3 mm
• Screw Thread Type: M3
• Screws Included: 4 pcs
• Total Weight: 8 g
• Body Style: Rigid cylindrical sleeve
• Finish: Smooth machined brass

Package Includes

• 1 × Double Pass Brass Coupling (3mm × 3mm)
• 4 × M3 Holding Screws