Used attributively and †in the possessive to designate a series of screw threads proposed by Whitworth in 1841 (and later additions to it), fasteners…
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| 单词 | θ213049 |
| 释义 | society > occupation and work > equipment > building and constructing equipment > fastenings > [adjective] > screw > types of screw or thread (4) Whitworth1877 Used attributively and †in the possessive to designate a series of screw threads proposed by Whitworth in 1841 (and later additions to it), fasteners… acme thread1908 a type of screw thread having flat apexes and valleys (as in a square thread), but with the sides of the threads inclined at an angle of 29 degrees. self-tapping1912 Designating a hardened screw, bolt, etc., designed to cut its own thread in the hole into which it is driven. Cf. tap, v.1 6a. Phillips1935 A proprietary name for: (a) a screw having a slot in the form of a recessed, equal-armed cross; (b) a screwdriver having a corresponding shape… |
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