| 单词 | unified screw thread |
| 释义 | unified screw thread [`yü·nǝ´fīd `skrü ´thred] DESIGN ENGINEERING Three series of threads: coarse (UNC), fine (UNF), and extra fine (UNEF); a 1/4-inch-diameter (0.006-millimeter) thread in the UNC series has 20 threads per inch, while in the UNF series it has 28. |
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