A pull and turn bolt lock for mounting in an opening (12, 112) in a thin wall (14, 114, 214, 314, 414), in particular for bracing push-in units (14, 114, 214, 414), doors or flaps in control boxes (16, 216, 416), comprising a housing (18, 118, 218, 318, 418) which can be fixed in a non-round opening (12, 112) in a thin wall (14, 114, 214, 414), a shaft (20, 220, 420) which is borne rotatably in the housing (18, 118, 218, 418) but in an axially non-displaceable manner and which is provided with an external thread (22, 222, 422), on which shaft (20, 220, 420) a bolt (26, 226, 426), which is provided with a suitable thread, is guided under a pressure load by a spring (32, 232, 432), which encompasses the shaft (20, 220, 420), in the housing (18, 118, 218, 418) such that when the shaft (20, 220, 420) is rotated by means of a hand or a tool in the stop position on the outer end of the shaft (20, 220, 420) or when pressure is relieved, it realises a rotational movement comprising at least 90 degrees with the shaft (20, 220, 420), and, in the position remote from the stop position, when being axially guided, such as via an axial slot formed in the housing (20, 220, 420) for the bolt when the shaft (20, 220, 420) is rotated, a translational movement is realised in the axial direction, wherein the housing (18, 118, 218, 418) has a head piece which, in a mounted state, overlaps the outer rim of the opening (12, 112), such as flange (52, 152, 252, 352, 452), from which a body part (54, 154, 254, 354, 454), which projects through the opening (12, 112), extends integrally, wherein a sleeve, which is axially slotted and provided with a flange on one end, encompasses the spring, said flange having a marking, such as a notch or opening, and, moreover, being rotatably held on the head piece of the housing, and wherein the flange of the sleeve supports, with a peripheral region facing the spring, the spring and the outer end of the shaft against the spring force, wherein the slot of the sleeve is gripped by the bolt and transfers its rotational movement onto the sleeve and thus onto its flange, such that the marking on the flange of the sleeve is aligned with its slot, characterised in that the housing also bears a marking (111, 113) which, in conjunction with the marking on the flange of the sleeve, indicates specific rotational positions of the bolt, in particular its end positions offset by 90 degrees (bolt in the open and in the closed position), for example, and in that the marking on the flange of the sleeve is a notch or an opening, and in that the marking (111, 113) on the housing is a colour dot applied such that in one position (e.g. open position) of the bolt the notch or opening enables the viewing, e.g. of a red colour dot, in the second position (e.g. the closed position offset by 90 degrees) e.g. the view of a green colour dot, characterised in that there protrude, from the body part (54, 154, 254, 354, 454) in the direction of its outer surface, resilient holding elements (56, 156, 256, 356, 450) which represent displaceably borne push elements and a self-locking contact surface or contact line or contact point (58, 458) for supporting the body part (54, 154, 254, 354, 454) in a play-free manner on the rim or the edge (46, 146) of the opening (12, 212), and in that the body part (54, 154, 254, 454) has a substantially rectangular cross section and at least one holding element originates respectively from two opposing rectangular sides, and in that the holding elements (56, 156, 256, 456) are push elements arranged symmetrically in relation to the axis (74, 274) of the shaft (20, 220, 420).