$fn=90;
use <threads.scad>;

module gewinde(dia, L=10, innen=false) {
    metric_thread(
      diameter=dia
      , pitch=2
      , length=L
      , leadin=3
      , internal=innen
      , n_starts=1
      , test=false
    );
}

module body() {
  difference() {
    cylinder(d=54, h=10);
    gewinde(dia = 51.5);
  }
}

module deckel() {
  difference() {
    gewinde(dia = 51);
    cylinder(d=45, h=10);
  }  
}

translate(v = [-30,0,0]) body();
translate(v = [+30,0,0]) deckel();