The SQ/SQZ series refers to a type of square flange needle roller bearing unit, where the "SQ" designation typically indicates a standardized compact housing with a square flange and integrated needle roller bearing. The "SQZ" variant often implies an extended inner ring or special sealing configuration for enhanced axial stability or contamination protection. These units combine a needle roller and cage assembly pressed into a square-shaped housing with four corner mounting holes, enabling direct rigid fixation to flat surfaces. The square flange design provides superior anti-rotation stability compared to circular flanges, making it suitable for applications with high moment loads or vibration. Pre-lubricated and optionally sealed versions are available for extended service life.
