Rotary cutter for cutting damaged threads of a bolt

A rotary cutter for cutting damaged threads of a bolt, comprising:

• a body rotatable about a rotating axis, wherein the body includes a connecting end and an operative end opposite to the connecting end along the rotating axis, wherein a cutting space extends along the rotating axis from the operative end towards but spaced from the connecting end, wherein the body further includes a first cutting blade disposed on an inner periphery thereof facing the cutting space, wherein the inner periphery of the body facing the cutting space includes a first scrap discharge groove, wherein the first scrap discharge groove corresponds to the first cutting blade, is located on a front side of the first cutting blade, and adjoins the first cutting blade, wherein the first scrap discharge groove includes a first end intercommunicating with the cutting space and a second end extending through the body to an outer periphery of the body, wherein the body further includes a virtual projection plane perpendicular to the rotating axis, wherein a first virtual plane passes through the first cutting blade and extends perpendicularly to the virtual projection plane, wherein a virtual circle and a first virtual reference line are located on the virtual projection plane, wherein the virtual circle has a diameter between 1 mm and 20 mm, wherein the first virtual reference line intersects the rotating axis and passes through an intersection of the first virtual plane and the virtual circle, and wherein an angle between the first virtual reference line and the first virtual plane and on the virtual projection plane is between 5° and 40°, and wherein the first end of the first scrap discharge groove and the rotating axis are respectively located on two sides of the first virtual plane.