Thread is the important part of brass fitting
It Provide mechanical support and seal
Every thread have some very import information:Crest ,Root,Flank Angle,Pitch,Outside diameter.
Pitch:The distance between the thread like Crest to Crest,Root to Root.
And pitch have different writing method:metric thread, inch thread.common fitting’s
Metric thread pitch:1.0mm、1.5mm、2.0mm
Common fitting’s inch thread pitch:11、14、18、20
When the thread is Tapered thread. It also have taper angle.
Outside diameter: outside diameter(crest-crest)