Abstract: An expansion anchor with a bolt and at least one expansion element is disclosed. An oblique surface is arranged in the region of the first end of the bolt and forces the expansion element radially outward on the bolt if the bolt is displaced in a pull-out direction relative to the expansion element. The bolt has, in the region of its rear end facing away from the first end, a load-absorber which is suitable for introducing tensile forces which are directed in the pull-out direction into the bolt. At least one groove which is closed with respect to the first end is made in the oblique surface, which groove reduces the contact surface between the expansion element and the oblique surface.

Abstract: An expansion anchor including a stud, at least one expansion element, and at least one slanted surface that is arranged on the stud and that pushes the expansion element radially outwards when the stud is moved in a pull-out direction relative to the expansion element is provided. It is provided that the coefficient of friction between the expansion element and the slanted surface is dependent on the direction.

Abstract: An expansion anchor including a stud and at least one expansion element arranged on the stud, whereby the stud has a slanted surface that pushes the expansion element radially outwards when the stud is moved in a pull-out direction, relative to the expansion element is provided. It is provided that the expansion anchor has at least one swelling element consisting of a swellable compound that can swell in order to secure the expansion element onto the wall of a drilled hole in the pull-out direction.

Abstract: An expansion anchor is provided having a stud and at least one expansion sleeve that surrounds the stud, whereby, on the stud, there is an expansion cone that radially widens the expansion sleeve when the expansion cone is pulled into the expansion sleeve. It is provided that the expansion sleeve has a hardness of more than 350 HV in the area of its front end facing the expansion cone, whereby the hardness of the expansion sleeve decreases towards its rear end. A production method for such an expansion anchor is also provided.

Abstract: An expansion anchor for anchoring in a drilled hole in a substrate, including a bolt with a front end and a rear end opposite the front end, an expansion sleeve arranged on the bolt, an expansion cone pressing the expansion sleeve radially outward when the expansion cone is displaced in an extraction direction relative to the expansion sleeve, a counter bearing for axially pressing an attachment part to the substrate, and arranged in the region of the rear end of the bolt, and a spring element arranged on the bolt for axially tensioning the counter bearing against the attachment part. The axial spring force F of the spring element lies in the range from Fmin<Fmax where Fmin=dmax×0.2 kN/mm?0.8 kN Fmax=dmax×0.6 kN/mm if the spring element is axially slackened 0.4 mm to 0.8 mm from its maximum spring deflection.

Abstract: In the case of a thread-tapping screw (1), especially a concrete screw (2), including a screw head (3), a screw shank (5) and a thread (6) that is formed on at least part of the screw shank (5), whereby at least one longitudinal groove (9) is formed on a front section (7) of the screw (1), starting at the end (4) of the screw on the screw shank (5), and the at least one longitudinal groove (9) is delimited on the screw shank (5) by two lengthwise sides (10) running essentially radially relative to a longitudinal axis (8) of the screw (1), it is the objective that the tightening torque needed when the screw (1) is being screwed into a drilled hole should be slight, and that the screw (1) should be produced cost-effectively.

Abstract: In the case of a thread-tapping screw (1), especially a concrete screw (2), including a screw head (3), a screw shank (5) and a thread (6) that is formed on at least part of the screw shank (5), whereby at least one longitudinal groove (9) is formed on a front section (7) of the screw (1), starting at the end (4) of the screw on the screw shank (5), and the at least one longitudinal groove (9) is delimited on the screw shank (5) by two lengthwise sides (10) running essentially radially relative to a longitudinal axis (8) of the screw (1), it is the objective that the tightening torque needed when the screw (1) is being screwed into a drilled hole should be slight, and that the screw (1) should be produced cost-effectively.

Abstract: A method is described for anchoring a fastening element (11) in a mineral component (1), in which a bore hole (2) is provided in the component (1) using a drill bit having a nominal drill bit diameter, and a fastening element (11) is then screwed into the provided bore hole (2). The fastening element (11) has a shank (12) which is provided with rotary engagement device (16) for a setting tool, and has a core diameter (K) and cutting edges (21) on a first end region. The fastening element has a self-tapping thread (17) in which the difference between the outer diameter of the thread (17) and the core diameter (K) of the shank (12) corresponds to 0.05 to 0.7 times the pitch of the thread (17). A drill bit is used which has a nominal drill bit diameter corresponding to 0.95 to 1.10 times the core diameter (K) of the shank (12). Also described is a fastening element (11) for anchoring in a mineral component (1).

Abstract: A thread-tapping screw (11) has a thread (21) extending, starting from the screw shaft free end (15), at least along a portion of the shaft length and a height of which constantly decreasing toward the free end (15) of the shaft (12), and a plurality of cutting bodies (26, 36, 46, 56, 66) formed of a material having a greater hardness than hardness of the thread (21), located in recesses (24) formed in the thread (21) and opening radially outwardly and having, respectively, a radial outer profile (27, 37, 47, 57, 67) projecting, at least partially, beyond the thread and a height (A, B, C, D, E) of which decreases toward the free end (15) of the shaft (12) stepwise.

Abstract: A fastening element having a torque-receiver for a setting tool and having a shank bearing a tapping thread that has a free end facing away from the torque-receiving means, and that has a thread-core diameter. The thread has one thread having a thread leading end in the region of the free end of the shank, whose outside diameter, starting from the free end, increases to a maximum outside diameter and, starting from its maximum outside diameter and continuing toward the torque-receiving means, decreases quasi-continuously to a smaller outside diameter. The thread-core diameter of the shank, starting from a region next to the torque-receiving means and continuing toward the free end of the shank, decreases quasi-continuously to a smaller thread-core diameter of the shank.

Abstract: A thread-tapping screw (11) has a thread (21) extending, starting from the screw shaft free end (15), at least along a portion of the shaft length and a height of which constantly decreasing toward the free end (15) of the shaft (12), and a plurality of cutting bodies (26, 36, 46, 56, 66) formed of a material having a greater hardness than hardness of the thread (21), located in recesses (24) formed in the thread (21) and opening radially outwardly and having, respectively, a radial outer profile (27, 37, 47, 57, 67) projecting, at least partially, beyond the thread and a height (A, B, C, D, E) of which decreases toward the free end (15) of the shaft (12) stepwise.

Abstract: A fastening element for mineral constructional components includes a thread-tapping thread (21, 41) extending at least partially along the stem (12, 32) of the fastening element and having side flanks (23, 24, 45, 47), with the side flanks (23, 24, 45, 47) form together an angle (W, V) of from 10° to 35°, and with a ratio of an outer diameter (A) of the thread (21, 41) to a root diameter (K) of the stem (12, 32) amounting to from 1.1 to 1.4, and a ratio of the outer diameter (A) of the thread (21, 41) to a pitch (P) of the thread (21, 41) amounting to from 1.4 to 1.7.