Bushing for a wind turbine rotor blade, flange insert, wind turbine rotor blade and wind turbine

A bushing (116) for a wind turbine rotor blade (104), the bushing (116) comprising:

• a first bushing end (117) and an opposite second bushing end (118);
• and
• a bushing bore (119) which extends in a region between the first bushing end (117) and the second bushing end (118) and comprises a bore longitudinal axis (120);
• wherein, along the bore longitudinal axis (120) in the direction of the second bushing end (118),
• the bushing bore (119) comprises a threaded portion (127), and
• the bushing (116) comprises a bushing runout (128) that follows the threaded portion (127), said bushing runout comprising a widening portion (131) of the bushing bore (119), wherein the widening portion (131) forms at least 50% of the bushing runout (128), and wherein in the widening portion (131) a diameter (132) of the bushing bore (119) enlarges monotonically while an increase in diameter decreases monotonically in such a manner that the bushing runout (128) comprises an arc-shaped course along the entire length of the widening portion (131).