A pin member (12, 112), comprising: - an elongated shank portion having a first end, a second end opposite the first end, a smooth cylindrical shank portion, a threaded portion located at the second end and having a plurality of external threads, optionally a head located at the first end, and an end face (30, 130) located at the second end, the head or the end face (30, 130) having a recess (28, 128) formed therein, wherein the recess (28, 128) includes a plurality of splines (32, 132) extending axially and positioned circumferentially and equally spaced about a periphery thereof and extending inwardly, wherein each of the plurality of splines (32, 132) includes a first bearing surface (36, 136) and a second bearing surface (38, 138), wherein the recess (28, 128) includes a plurality of recesses (34, 134) extending axially and formed circumferentially and equally spaced about the periphery, each of the plurality of recesses (34, 134) being located between a corresponding pair of the plurality of splines (32, 132), characterized in that each of the first bearing surfaces (36, 136) of each of the plurality of splines (32, 132) of the recess (28, 128) is oriented at a first angle extending and measured from a radial line that extends from a center point of the elongated shank portion to a first point on such first bearing surface (36, 136) located proximate to a minor inner diameter of such spline (32, 132) in a rotational direction towards the second bearing surface (38, 138) of such spline (32, 132), wherein each of the second bearing surfaces (38, 138) of each of the plurality of splines (32, 132) is oriented at a second angle extending and measured from the radial line in a rotational direction towards such second bearing surface (38, 138) of such spline (32, 132), and wherein a corresponding pair of the first bearing surface (36, 136) and the second bearing surface (38, 138) of each of the plurality of splines (32, 132) are perpendicular to one another. - an elongated shank portion having a first end, a second end opposite the first end, a smooth cylindrical shank portion, a threaded portion located at the second end and having a plurality of external threads, optionally a head located at the first end, and an end face (30, 130) located at the second end, the head or the end face (30, 130) having a recess (28, 128) formed therein, wherein the recess (28, 128) includes a plurality of splines (32, 132) extending axially and positioned circumferentially and equally spaced about a periphery thereof and extending inwardly, wherein each of the plurality of splines (32, 132) includes a first bearing surface (36, 136) and a second bearing surface (38, 138), wherein the recess (28, 128) includes a plurality of recesses (34, 134) extending axially and formed circumferentially and equally spaced about the periphery, each of the plurality of recesses (34, 134) being located between a corresponding pair of the plurality of splines (32, 132), characterized in that each of the first bearing surfaces (36, 136) of each of the plurality of splines (32, 132) of the recess (28, 128) is oriented at a first angle extending and measured from a radial line that extends from a center point of the elongated shank portion to a first point on such first bearing surface (36, 136) located proximate to a minor inner diameter of such spline (32, 132) in a rotational direction towards the second bearing surface (38, 138) of such spline (32, 132), wherein each of the second bearing surfaces (38, 138) of each of the plurality of splines (32, 132) is oriented at a second angle extending and measured from the radial line in a rotational direction towards such second bearing surface (38, 138) of such spline (32, 132), and wherein a corresponding pair of the first bearing surface (36, 136) and the second bearing surface (38, 138) of each of the plurality of splines (32, 132) are perpendicular to one another. wherein the recess (28, 128) includes a plurality of splines (32, 132) extending axially and positioned circumferentially and equally spaced about a periphery thereof and extending inwardly, wherein each of the plurality of splines (32, 132) includes a first bearing surface (36, 136) and a second bearing surface (38, 138), wherein the recess (28, 128) includes a plurality of recesses (34, 134) extending axially and formed circumferentially and equally spaced about the periphery, each of the plurality of recesses (34, 134) being located between a corresponding pair of the plurality of splines (32, 132), characterized in that each of the first bearing surfaces (36, 136) of each of the plurality of splines (32, 132) of the recess (28, 128) is oriented at a first angle extending and measured from a radial line that extends from a center point of the elongated shank portion to a first point on such first bearing surface (36, 136) located proximate to a minor inner diameter of such spline (32, 132) in a rotational direction towards the second bearing surface (38, 138) of such spline (32, 132), wherein each of the second bearing surfaces (38, 138) of each of the plurality of splines (32, 132) is oriented at a second angle extending and measured from the radial line in a rotational direction towards such second bearing surface (38, 138) of such spline (32, 132), and wherein a corresponding pair of the first bearing surface (36, 136) and the second bearing surface (38, 138) of each of the plurality of splines (32, 132) are perpendicular to one another.