乒乓球总决赛时间:Bolt nut

發布日期:2017-05-17 15:12:02 來源:
The bolt and nut are made of high quality alloy steel 40Cr, and the cold forging technology is adopted. After the heat treatment, the mechanical performance can reach more than 8.8. When installing, only one wrench can be used, and the use is safe and firm.



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