A seal member (202, 402) adapted for use in sealing a joint having a first member pivotable about a rotational axis relative to a second member thereof, for a track chain joint assembly of an undercarriage of a track-type machine, the seal member (202, 402) comprising: a first member engagement surface (242, 442), a second member engagement surface (244, 444), a frusto-conical inner relief surface (246, 446), a thrust ring engagement surface (248, 448), and an outer relief surface (250, 450), the seal member (202, 402) being characterized by the first member engagement surface (242, 442) including an axial segment (260, 460), extending along the rotational axis, and a radial segment (262, 462), extending along a radial axis perpendicular to the rotational axis; the second member engagement surface (244, 444) being adjacent the axial segment (260, 460) of the first member engagement surface (242, 442) and extending radially outward, measured along the radial axis, of the radial segment (262, 462) of the first member engagement surface (242, 442); the frusto-conical inner relief surface (246, 446) being adjacent the second member engagement surface (244, 444) such that the second member engagement surface (244, 444) is between the axial segment (260, 460) of the first member engagement surface (242, 442) and the frusto-conical inner relief surface (246, 446); the thrust ring engagement surface (248, 448) extending along the rotational axis between the radial segment (262, 462) of the first member engagement surface (242, 442) and the frusto-conical inner relief surface (246, 446); and the outer relief surface (250, 450) being disposed between the radial segment (262, 462) and the axial segment (260, 460) of the first member engagement surface (242, 442). a first member engagement surface (242, 442), a second member engagement surface (244, 444), a frusto-conical inner relief surface (246, 446), a thrust ring engagement surface (248, 448), and an outer relief surface (250, 450), the first member engagement surface (242, 442) including an axial segment (260, 460), extending along the rotational axis, and a radial segment (262, 462), extending along a radial axis perpendicular to the rotational axis; the second member engagement surface (244, 444) being adjacent the axial segment (260, 460) of the first member engagement surface (242, 442) and extending radially outward, measured along the radial axis, of the radial segment (262, 462) of the first member engagement surface (242, 442); the frusto-conical inner relief surface (246, 446) being adjacent the second member engagement surface (244, 444) such that the second member engagement surface (244, 444) is between the axial segment (260, 460) of the first member engagement surface (242, 442) and the frusto-conical inner relief surface (246, 446); the thrust ring engagement surface (248, 448) extending along the rotational axis between the radial segment (262, 462) of the first member engagement surface (242, 442) and the frusto-conical inner relief surface (246, 446); and the outer relief surface (250, 450) being disposed between the radial segment (262, 462) and the axial segment (260, 460) of the first member engagement surface (242, 442).