Abstract: A chuck of the type having a body with a plunger that moves axially and is operably connected with wedges that move the jaws radially in response to movement of the plunger. The body is formed with guide surfaces, which maintain contact with the plunger at all times, and also with bearing surfaces which support peripheral surfaces of the wedges.

Abstract: Three gripping jaws are slidably engaged in respective radial guide grooves in the front face of an annular jaw carrier for holding work to be machined. Each gripping jaw has a wedge integrally projecting rearwardly therefrom. The wedge is of T-shaped cross section, including a web extending radially of the jaw carrier and a flange at the inner end of the web. Slidably mounted in the jaw carrier for axial movement therein, a plunger has undercut wedge grooves for slidably receiving the flanges and parts of the webs of the respective wedges, causing the radial motion of the gripping jaws by a wedging action upon axial motion of the plunger. A pair of opposed overhanging portions formed by each undercut wedge groove in the plunger are caught between the jaw carrier and the flange of one of the wedges.