Ball Bearing d12xD18xw4 [Thunder Tiger]

Standard metric bearing size used in RC helicopter heads and drivetrain components.

Compact high-speed bearing for precision applications

This metric ball bearing (commonly known as size 6701) is widely used in RC helicopters for head assemblies, tail systems, and drivetrain components requiring compact, high-speed rotation.

Specifications:

Inner diameter (ID): 12 mm
Outer diameter (OD): 18 mm
Width: 4 mm
Type: Deep groove ball bearing
Material: Chrome steel (typical)
Application: Rotor head / tail / drivetrain