Abstract: A fastener comprising a body and a lock washer to be positioned between the body and a work surface, the washer having a plurality of circumferentially spaced cam surfaces, each being inclined relative to a plane normal to the center axis within a cam radial angle, alternating circumferentially about the center axis with a plurality of circumferentially spaced slip surfaces, each being inclined relative to the plane within a slip radial angle, each of the cam surfaces intersecting with two adjacent slip surfaces at a radial ridge and a radial valley, wherein the cam radial angle is greater than the slip radial angle and a radial angle ratio between the cam and slip radial angles is less than or equal to about 4.5, and the ridge having a ridge height relative to the valley greater than or equal to about 0.08 mm.

Abstract: This invention provides a fastener (20) that is adapted to be mounted in a hole provided in a wall (not shown). The improved fastener comprises: an elongated tubular body (21) having a first end (23) and a second end (24), having an outwardly-extending flange (25) adjacent the first end, having an intermediate portion (27), and having a distal marginal end portion (37) adjacent the second end, the body also having an abutment surface (32) facing toward the second end; and a member (22) adapted to be inserted into the body through the second end, the member having an abutment surface (40) adapted to bear against the body abutment surface, and having an outer polygonal surface (41); and wherein the body marginal end portion (37) is adapted to be plastically deformed about the member to hold the member within the body.

Abstract: This invention provides a fastener (20) that is adapted to be mounted in a hole provided in a wall (not shown). The improved fastener comprises: an elongated tubular body (21) having a first end (23) and a second end (24), having an outwardly-extending flange (25) adjacent the first end, having an intermediate portion (27), and having a distal marginal end portion (37) adjacent the second end, the body also having an abutment surface (32) facing toward the second end; and a member (22) adapted to be inserted into the body through the second end, the member having an abutment surface (40) adapted to bear against the body abutment surface, and having an outer polygonal surface (41); and wherein the body marginal end portion (37) is adapted to be plastically deformed about the member to hold the member within the body.