Are you buying the hardware lock? Hardware lock purchase tips

There are many kinds of hardware lock materials on the market, the processing technology is diverse, and the specifications are not the same. Then how to choose the hardware lock on the door, Xiaobian compiled some hardware manuals, and detailed instructions on how .......

Processing points of 90° counterbore and 90° countersunk screws

Cao or Xuan Qihang (China Air-to-Air Missile Research Institute, Luoyang, Henan 471099) L. However, in the actual machining process, due to the separate processing of the two parts, there is often a problem of countersinking and countersinking mismatch when assembling the site. According to.......