Start with the complete designation从完整型号开始
Prefixes and suffixes can define materials, seals, clearance, accuracy, cage design and lubrication. A basic series number is often not enough.前后缀可能代表材料、密封、游隙、精度、保持架和润滑，仅有基础系列号通常不够。
- Photograph the marking on the bearing and packaging拍摄轴承本体与包装上的型号标识
- State the preferred brand and whether alternatives are acceptable注明指定品牌及是否接受替代品牌
- Add shaft, housing or drawing dimensions when the code is unclear型号不清楚时提供轴、轴承座或图纸尺寸
Describe the operating condition说明实际工况
A reliable replacement must fit the machine and the duty. Load, speed and environment can rule out an otherwise dimensionally identical bearing.可靠替代不仅要尺寸相同，还必须适应设备工况；载荷、转速和环境可能排除外形相同的型号。
- Radial and axial load, speed and duty cycle径向与轴向载荷、转速及工作循环
- Temperature, moisture, dust, chemicals or washdown温度、潮湿、粉尘、化学介质或清洗条件
- Noise, precision, clearance and lubrication requirements噪声、精度、游隙及润滑要求
Make commercial requirements explicit明确商务与交付要求
Clear quantities and logistics information help the supplier separate sample, production and replenishment pricing.明确数量和物流信息，有助于供应商区分样品、批量和补货报价。
- Sample quantity, annual usage and order quantity样品数量、年用量及单次采购量
- Required delivery date and destination country要求交期及目的国家
- Packing, certificates, inspection or labelling requirements包装、证书、检验或标签要求