首页>
外国专利>
praegestempel for the formation of a cross recess in the head of phillips-head screws
praegestempel for the formation of a cross recess in the head of phillips-head screws
展开▼
机译:praegestempel用于在十字头螺钉的头部形成十字槽
展开▼
页面导航
摘要
著录项
相似文献
摘要
A screw having a head and a threaded shank and, in the head, a cruciform shaped recess comprising a central cavity and four grooves radiating from the central cavity at 90 DEG angular spacings, the bases of the grooves lying on a conical (or pyramidal) surface and wherein the included angle at the vertex of such cone (or pyramid) has a value within the range of 40 DEG - 45 DEG , the preferred value being 40 DEG .
展开▼