The bottom of the groove of a screw thread.
单词 | θ213119 |
释义 | society > occupation and work > equipment > building and constructing equipment > fastenings > [noun] > screw > thread > parts of thread (4) root1865 The bottom of the groove of a screw thread. lead1905 Mechanics. The axial distance travelled by a screw thread in one revolution. Cf. pitch, n.2 25b. crest1916 (See quot. 1954.) flank angle1951 (see quot. 1954). |
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