Socket wrench opening

摘要

A wrench for turning a fastener nut having a central axis and an even-numbered plurality of flat bounding surfaces parallel to the central axis with diametrically opposite pairs being parallel to each other. The wrench includes a fastener nut engaging socket defined about a central socket axis by a plurality of uniformly spaced peripherally and radially disposed protuberances and plurality of uniformly spaced corner recesses disposed between the protuberances. Each protuberance includes side-by-side angularly related straight engaging surfaces at substantially 142 DEG outside obtuse angles to each other for registry with the flat surfaces on the fastener nut and complementary side surfaces outwardly diverging from said engagement surfaces. Each recess is comprised of a first arcuate surface tangential to a circle about the central axis of the socket and transitional surfaces converging from the side surfaces of adjacent protuberances toward the first arcuate surface.