Abstract: An improved rotating head having an inner barrel disposed within and rotatingly supported on an outer barrel wherein a rotary drive member is connected to the inner barrel. A kelly is extendable through the inner barrel and the rotary drive member is adapted to grippingly and sealingly engage the kelly so that rotation of the kelly causes rotation of the rotary drive member and the inner barrel connected thereto, the engagement between the rotary drive member and the kelly providing the sole source for rotating the rotary drive member and the inner barrel connected thereto. The rotary head also includes a bearing adjustment assembly which facilitates the rotatability of the inner barrel.