| 摘要 |
The threaded sleeve is a sleeve which is produced from steel, hardened steel or from another metal which can be moulded, is rolled up obliquely and has an impressed thread pitch. The sleeve ends are at a distance in order to permit sprung insertion into a drilled hole. The winding ends do not have the full curvature of the sleeve, in order to permit improved gripping of the screws which are to be screwed in, and in order to prevent the sleeves turning round.
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