Anchor Bolt is a kind of tighten firmware made up of nod and screw(a cylinder with
outside screw thread).Anchor Bolt needs to cooperate with nut, which working on
connecting two parts with equal aperture stably.This connection form is named as
Anchor Bolt connection.For screwing off nut from Anchor Bolt,then the two parts are
divided,that Anchor Bolt belongs to may knock down connection.