| 摘要 |
<p>To certainly move a screw member to a screw hole of a member to be fastened, a screw member 1 includes a male screw 2, and an inner peripheral face of the hole 4 has an engaging recessed part 5 to be engaged with an engaging projected part 11 of a tapered engaging part 10 of a rotary tool 9, and a stepped part 6, the inner peripheral face of the hole 4 is parallel or make close to a center axis 7 of the screw member 1 from the head part 3 to the direction of the male screw and from the stepped part 6 to the direction of the male screw, and head part side end edge 8a and the end edge of the stepped part 8b to be engaged with the engaging projected part 11 have an angle of inner peripheral face of the hole 4 is 90±5 degrees with respect to the head part 3 and the stepped part 6.</p> |
