Blind fastener for producing a permanent connection between or among workpieces defining a hole when the blind fastener is pulled by a tool to set the fastener by applying a predetermined tensile load thereto, the blind fastener comprising: - a body with a hollow shank comprising a first end and a second end and having a given outer diameter (Ds, Ds'), and a radial enlargement portion forming a body head at the first end of the shank , - a stem with an elongated cylindrical shaft extending along a first axis A-A and a radially enlarged stem head , wherein the shaft partly extends through the hollow shank , comprises a stem-tail which projects from the first end of the shank and a weakened portion, wherein the stem head comprises an underside facing the shaft , wherein the shaft comprises two diametrically opposed depressions provided between the weakened portion and the stem head , characterized in that the depressions extend from the underside of the stem head or in a close vicinity of the underside of the stem head , and is adapted to form an interlock with the body in a mounted position of the blind fastener , wherein the depressions , in a cross-section, have a V-shape with a inclined flat first surface , a second surface comprising a second radius of curvature (R2), the first and second surfaces being connected by an intermediate portion having a first radius of curvature (R1), different from the second radius of curvature (R2). - a body with a hollow shank comprising a first end and a second end and having a given outer diameter (Ds, Ds'), and a radial enlargement portion forming a body head at the first end of the shank , - a stem with an elongated cylindrical shaft extending along a first axis A-A and a radially enlarged stem head , wherein the shaft partly extends through the hollow shank , comprises a stem-tail which projects from the first end of the shank and a weakened portion, wherein the stem head comprises an underside facing the shaft , wherein the shaft comprises two diametrically opposed depressions provided between the weakened portion and the stem head , characterized in that the depressions extend from the underside of the stem head or in a close vicinity of the underside of the stem head , and is adapted to form an interlock with the body in a mounted position of the blind fastener , wherein the depressions , in a cross-section, have a V-shape with a inclined flat first surface , a second surface comprising a second radius of curvature (R2), the first and second surfaces being connected by an intermediate portion having a first radius of curvature (R1), different from the second radius of curvature (R2). wherein the shaft comprises two diametrically opposed depressions provided between the weakened portion and the stem head , characterized in that the depressions extend from the underside of the stem head or in a close vicinity of the underside of the stem head , and is adapted to form an interlock with the body in a mounted position of the blind fastener , wherein the depressions , in a cross-section, have a V-shape with a inclined flat first surface , a second surface comprising a second radius of curvature (R2), the first and second surfaces being connected by an intermediate portion having a first radius of curvature (R1), different from the second radius of curvature (R2). <EOS>