Method and apparatus for engaging threaded members.

A piston device, is provided with an external screw thread (16) and a first component comprises a (10) and second opening component (12), the first member and opening. The second component is provided with multiple movable arranged in threaded element (28), a containing the first member external screw. Model claims a structure, and making the first member (10) is fixed through a linear sliding element is sleeved in the second component (12), wherein the; the first member (10), (12) inlet is engaged with the second component. And realizing than the first member (10), according to the reverse direction of the rotating the first member (10), afterward Jan with the second component of manually (12), relieves threaded element (28) gnawing to shape, making the first member is arranged from the second component to form a water.