They use steel races with lightweight ceramic balls to reduce friction and improve longevity
SSUCPAS207-35mm is Set Screw Locking
the 22326EXW33K inner diameter is 130mm
low-friction use in demanding environments
NJ207EG Nachi Cylindrical Roller Bearings
NBK Japan MFBS-12C 4mm to 4mm Bellows-type Flexible Coupling Stainless Steel, Zero-Backlash Bellows Flexible Shaft Coupling for Servo and Stepper Motors 1 inch ID They use steel races withNBK MFBS 12C Stainless Bellows Type Flexible Coupling 4mm to 4mm for Servo and Stepper Motors Zero Backlash, High Torque, Made in Japan NBK MFBS 12C stainless bellows coupling, 4 mm to 4 mm bore, 23. 5 mm length, 12 mm OD, zero backlash and high torsional rigidity for precise motion NBK Japan MFBS 12C is a bellows type flexible coupling that connects motor shafts to driven loads in precision motion systems such as CNC machines, 3D printers, and