The meaning of 6204:
6 is the model code, representing deep groove ball bearing;
2 is the size series code, which refers to a certain size series, as well as 3 series, 4 series, 17 series, etc.
04 is the nominal inner diameter code of the bearing, indicating that the inner diameter of the bearing is 20mm；;
Explanation: codes greater than 04 can be multiplied by 5, which is the bearing inner diameter, such as 6206, and the bearing inner diameter is 30mm；; However, if it is less than 04, the internal diameter of 03 is 17mm, that of 02 is 15mm, that of 0 1 2mm, and that of 00 is 10mm.
Industry status
According to the data of "Forecast of Production and Marketing Demand and Analysis Report of Transformation and Upgrading of Bearing Manufacturing Industry in China", the total industrial output value of bearing manufacturing industry in China has been increasing year by year from 2009 to 20 13. In 20 13 years, the total industrial output value of the whole industry was 249.363 billion yuan, up by 12.92% year-on-year.
By analyzing the data in recent five years, it is found that the sales revenue of bearing manufacturing industry in China is also increasing year by year from 2009 to 20 13. In 20 13 years, the sales revenue was 24901200 million yuan, up1.80% year-on-year.
With the rapid development of China's bearing industry, bearing varieties have increased from less to more, product quality and technical level have increased from low to high, and industry scale has increased from small to large, forming a specialized production system with basically complete product categories and reasonable production layout.
Refer to the above content: Baidu Encyclopedia-Bearing