Skirted nut

In a skirted nut comprising a nut portion having a bearing face adapted to be applied onto the face of a member or part and a resilient skirt portion, the latter being substantially frusto-conical in shape and having a smaller base end region secured to the bearing face side of the nut portion and a larger base end region adapted to be applied onto the face of the member or part onto which the bearing face of the nut portion is adapted to be applied, the improvement comprising said skirt portion being formed by a wall having a substantially constant thickness throughout its height and including a rib integrally formed on the external surface of said skirt portion wall circularly extending around the entire periphery of said frusto-conical skirt portion at substantially the mid-portion of the height thereof, so as to be substantially within a plane which is perpendicular to the center axis of the frusto-conical skirt portion, said rib being substantially triangular in cross-section, whereby said skirt portion is prevented from turning upwardly and assuming a upwardly turned configuration during the threading of said nut portion as the bearing face of the nut portion moves toward the face of the member or part.