Verify the physical interface核对安装接口
Confirm bore, outside diameter, width, shoulder geometry and any snap-ring or flange features.确认内径、外径、宽度、挡肩结构以及止动环或法兰等特征。
- Boundary dimensions and tolerances外形尺寸与公差
- Shaft and housing fits轴与轴承座配合
- Chamfer, groove, flange and locating features倒角、沟槽、法兰及定位结构
Decode every suffix逐项确认后缀
Suffix systems vary by manufacturer. Similar-looking codes can describe different seals, cages, clearance or accuracy.各制造商的后缀体系不同，外观相近的代码可能代表不同的密封、保持架、游隙或精度。
- Open, shielded or contact/non-contact seals开式、防尘盖、接触或非接触密封
- Internal clearance and preload内部游隙与预压
- Cage, lubricant, material and heat treatment保持架、润滑、材料与热处理
Recheck performance in the application按工况复核性能
Compare dynamic and static capacity, limiting speed, temperature range, life assumptions and lubrication—not catalogue dimensions alone.除目录尺寸外，还需比较动静载荷、极限转速、温度范围、寿命假设和润滑条件。
- Load direction, shock and misalignment载荷方向、冲击与偏斜
- Speed, temperature and contamination速度、温度与污染
- Required life, noise and precision寿命、噪声与精度要求