use <threads1.scad>
module acmehexbolt_0p375(L)
{
Lh = 0.25;
Dh = 0.75;
Dth = 0.375;
Lth = L-Lh-0.125;
union()
translate([0,0,0])
cylinder(d=Dh,h=Lh,$fn=6);
}
translate([0,0,Lh-0.125])
thread_10tpi(Dth,Lth);
acmehexbolt_0p375(4);