| 摘要 |
PROBLEM TO BE SOLVED: To provide a holder for threading a coupling pipe, by which the threading can be carried out by fully utilizing a stroke of a tool rest of a threading machine. SOLUTION: The holder is composed of a tubular body having a small diameter threaded hole for supporting the coupling pipe by screwing and a comparatively larger diameter through threaded hole, and a threaded shaft which is screwed into the through threaded hole from its rear side and has a square hole formed at the front end.
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