IMPA 351833 Cam and groove coupler - material stainless steel Type D (female part with inner thread) -
Bearing Type: 625 V Groove Pulley Inner Diameter: 5mm V-type Pulley CNC Wheel for 3D Printers Industry Mechanical : Amazon.co.uk: Business, Industry & Science
Timken | Deep groove radial ball bearing with wide inner ring - non loading groove type 8016