Structural features: 　　
1. Material: The outer ring is low carbon steel; the inner ring is bearing steel. 　　
2. Heat treatment: inner ring quenching and spherical chromium plating. 　　
3. Structure: product extrusion forming; no oil tank oil hole. 　　
4. There is a PTFE sintered copper mesh between the inner and outer rings. 　　
5. Performance characteristics: with self-lubrication, bran resistance, self-aligning, low friction characteristics, suitable for low-speed, heavy-duty machinery.