.Technical requirements should be flat and smooth. Edges should be free of sharp angles, burrs, cracks and chips.
. The surface of the parts should be galvanized and passivated.
3. The moldy threads should be coated with anti-corrosion grease.
.Threaded connections should be manufactured according to the precision requirements of the ordinary thread standard in B. When the material box is screwed upright, there must be no sliding or loosening of teeth
/3/Hexagonal metal filler
Hexagonal stuffing box