Ball screw and spindle nut therefor

A spindle nut (S) for a ball screw, comprising:

• a substantially hollow-cylindrical workpiece of metal having an outer lateral surface MA and a central-symmetrical middle longitudinal axis (Z);
• a ball groove (K) arranged in a manner of a thread on a cylinder inner surface that is configured to receive balls of diameter d, the inner cylinder surface (G) being defined by a helical thread base line of the ball groove (K);
• ball deflections defined as straight, substantially cylindrical load-relief bores (B), that are arranged as a pair installed as channels for guiding the balls out of and into the ball channel (K) through a wall of the spindle nut, each said load-relief bore (B) being distinguished by a generatrix (L), which has an intersection point (C) with the thread base line of the ball channel (K) and constitutes a continuation of a traveling path of a ball from the ball channel (K) into the load-relief bore (B);
• and
• a tangent (T) to the cylinder surface (G) runs parallel at a spacing a >0 to the generatrix (L), with both the tangent (T) and the generatrix (L) being perpendicular to a common normal (R) to the middle longitudinal axis(Z).