| 摘要 |
A countersunk head screw is provided. The countersunk head screw includes a head attached to or integrally formed with a shank. A thread extends over a partial region of the shank and a portion of the head includes a bearing surface that tapers conically towards the shank. At least one restraint rib is arranged in a top region of the bearing surface turned away or spaced apart from the shank. Additionally, at least one cutting rib is arranged in a lower region of the bearing surface facing or adjacent the shank.
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