Patent ID: 7857564

Claim:
An expansion dowel, comprising an expansion sleeve ( 21 ); and an anchor bolt ( 12 ) having load application means ( 16 ) provided at a first end region ( 14 ) of the anchor bolt ( 12 ), and an expansion part ( 17 ) provided at a second free end region ( 15 ) of the anchor bolt ( 12 ) opposite the first end region ( 14 ), the expansion part ( 17 ) having a conical section ( 18 ) widening toward the second free end region ( 15 ) of the anchor bolt ( 12 ) for expanding the expansion sleeve ( 21 ) upon being pulled inside the expansion sleeve ( 21 ) in a direction opposite a setting direction of the dowel, wherein an inner profile ( 22 ) of the expansion sleeve ( 21 ) is provided with a region ( 23 ) having a surface roughness with an increasing profile elevation of closely spaced valleys and peaks of the inner profile in the direction opposite a setting direction of the dowel for essentially preventing the pulling of the expansion part through the expansion sleeve upon an applied torque exceeding a predetermined torque necessary for expanding the expansion sleeve ( 21 ).