| 摘要 |
<p>An object of improvement is a threading tool that includes multiple cutting edges 3 -1 to 3 -n (where n is 5 in the drawings) disposed side by side and that performs threading successively using the multiple cutting edges to form a thread. At least one of the cutting edges of the tool except a finishing edge 3 -5 is deviated in an opposite-to-feed-direction direction of the tool (may instead be the feed direction).</p> |
