A fitting for a sliding sash as a sash of a window or a door, having lower carriages movable on a running rail (1a; 44) fastenable on the frame and upper sliding elements displaceable in a slide rail (1b; 41) fastenable on the frame, - with a handle element, which exclusively has two switch positions (I, II), one for the locking of the sash in its closed position and one for its unlocking into the parallel detached position of the sash, from which detached position it is then laterally displaceable; - wherein the sash - avoiding a tilted positon - is movable from a closed position in the frame rebate (space) directly into the detached position and/or back into its closed position; - whereby the sash is connected to the carriages via lower extension scissors mechanisms, wherein each extension scissors mechanism consists of an extension arm linked on the carriage and a connecting rod articulated thereto, - and whereby drive rods, which can be mounted in the sash rebate (space) and are displaceable by the handle element, are provided for locking and unlocking the sash, characterized in that - the sash is connected to the sliding elements via upper extension scissors mechanisms or the sash is connected to one sliding element via an upper extension scissors mechanism and to a further sliding element via a linked extension arm, wherein each extension scissors mechanism consists of an extension arm linked on the sliding element and a connecting rod or control arm articulated thereto, - wherein an extension scissors mechanism of a lower carriage and an extension scissors mechanism of an upper sliding element has in each case a guide pin (15, 25) situated in their respective connecting rod (20, 34), which guide pin (15, 25) is held in a fixed control block (11, 35a) located at the beginning of the lower running rail and the upper slide rail, respectively, during the detaching movement until it can move sideways into a laterally offset catch recess of a controlling guide slot (16, 26) of the carriage or the sliding element, respectively, thus enabling the displacement of the carriage and the sliding element, thereby enabling the displacement of the sash. - with a handle element, which exclusively has two switch positions (I, II), one for the locking of the sash in its closed position and one for its unlocking into the parallel detached position of the sash, from which detached position it is then laterally displaceable; - wherein the sash - avoiding a tilted positon - is movable from a closed position in the frame rebate (space) directly into the detached position and/or back into its closed position; - whereby the sash is connected to the carriages via lower extension scissors mechanisms, wherein each extension scissors mechanism consists of an extension arm linked on the carriage and a connecting rod articulated thereto, - and whereby drive rods, which can be mounted in the sash rebate (space) and are displaceable by the handle element, are provided for locking and unlocking the sash, - the sash is connected to the sliding elements via upper extension scissors mechanisms or the sash is connected to one sliding element via an upper extension scissors mechanism and to a further sliding element via a linked extension arm, wherein each extension scissors mechanism consists of an extension arm linked on the sliding element and a connecting rod or control arm articulated thereto, - wherein an extension scissors mechanism of a lower carriage and an extension scissors mechanism of an upper sliding element has in each case a guide pin (15, 25) situated in their respective connecting rod (20, 34), which guide pin (15, 25) is held in a fixed control block (11, 35a) located at the beginning of the lower running rail and the upper slide rail, respectively, during the detaching movement until it can move sideways into a laterally offset catch recess of a controlling guide slot (16, 26) of the carriage or the sliding element, respectively, thus enabling the displacement of the carriage and the sliding element, thereby enabling the displacement of the sash.