The eminently easy to clean hinge GN238 was developed for mechanical engineering and is available in customary dimensions. Fastening screws of such hinges used to be visible. Especially adjustable versions with washers or elongated holes were in urgent need for designing. Particular discs for adjustment, which notch in the radial arranged dents of the hinge flank, when screwing down the countersink, are placed underneath a cover. The opportunity of adjusting the hinge facilitates primarily the mounting of lids and doors. Whether adjustable or nonadjustable version, the fastening elements remain hidden.