Fitting having an operating handle for a door, window or similar with a leaf mounted in a fixed frame, comprising an operating handle as a handle bar, a bearing device for moveably bearing the operating handle, a lock having a lock mechanism with a bolt and/or a latch, a connection device to the lock, wherein the lock mechanism with the bolt and/or latch is able to be arranged in the leaf, wherein it is provided that - the connection device has a coupling shaft, where appropriate having a drive, in order to connect the operating handle to a follower of the lock mechanism, and the bearing device has a supporting plate in order to fix the bearing device on the leaf, which has a first drill pattern, and - the bearing device has a bearing body with a U-shaped cross-section, said bearing body having two U-shaped arms protruding from the supporting plate, wherein the U-shaped arms have bearing receptors that are aligned with one another, a pivot bearing being arranged in said bearing receptors, said pivot bearing receiving a bearing shaft of the handle bar, - an adaptor supporting plate is provided to fix the bearing device on the leaf by interposing the adaptor supporting plate between the supporting plate of the bearing device and the leaf, characterised in that - the adaptor supporting plate has fixing holes which are arranged to correspond to the leaf-specific first drill pattern, and has threaded fixing locations with an external thread or internal thread which are arranged to correspond to a second drill pattern, wherein the supporting plate of the bearing device has fixing holes which are arranged to correspond to the second drill pattern, and - the threaded fixing locations are formed as threaded pins with an external thread or as threaded sleeves with an internal thread, - the threaded pins and/or the threaded sleeves are arranged to be protruding perpendicularly from the top of the adaptor supporting plate, and - the threaded pins and/or the threaded sleeves are welded onto the top of the adaptor supporting plate or are fixed by another joining connection. - the connection device has a coupling shaft, where appropriate having a drive, in order to connect the operating handle to a follower of the lock mechanism, and the bearing device has a supporting plate in order to fix the bearing device on the leaf, which has a first drill pattern, and - the bearing device has a bearing body with a U-shaped cross-section, said bearing body having two U-shaped arms protruding from the supporting plate, wherein the U-shaped arms have bearing receptors that are aligned with one another, a pivot bearing being arranged in said bearing receptors, said pivot bearing receiving a bearing shaft of the handle bar, - an adaptor supporting plate is provided to fix the bearing device on the leaf by interposing the adaptor supporting plate between the supporting plate of the bearing device and the leaf, - the adaptor supporting plate has fixing holes which are arranged to correspond to the leaf-specific first drill pattern, and has threaded fixing locations with an external thread or internal thread which are arranged to correspond to a second drill pattern, - the threaded fixing locations are formed as threaded pins with an external thread or as threaded sleeves with an internal thread, - the threaded pins and/or the threaded sleeves are arranged to be protruding perpendicularly from the top of the adaptor supporting plate, and - the threaded pins and/or the threaded sleeves are welded onto the top of the adaptor supporting plate or are fixed by another joining connection.