Lubricating oil and rolling threading method using the same for rolling threading

[PROBLEMS] To provide a lubricating oil for forming a rolling screw capable of forming a screw thread having good lubricity even at a high rotational speed and having a small recess at the top of the screw thread, and a rolling screw machining method using the same. provide. SOLUTION: To lubricating base oil, (A) a sulfur-based extreme pressure agent is added as an additive in an amount of 25-35% by weight, (B) an organic zinc compound is added in an amount of 6-16% by weight, and (C) a calcium-based additive is added in an amount of 2%. -12% by weight and (D) 2-13% by weight of an oil-based agent are blended, and a rolled screw is processed at a rotational speed of 400 rpm or more. [Selection] Figure 1