Abstract: Disclosed is a swivelable binding plate assembly for a snowboard, including a generally circular base plate having a bottom directly supported on a snowboard, a top surface, an outwardly projecting perimeter edge spaced above the snowboard, and a central opening with a perimeter edge adapted to be engaged by the lower part of the outer edge of a hold-down disk received in the central opening, the disk being securable to the snowboard by threaded bolts to hold the base plate down to the snowboard and against rotation.

Abstract: A swivelable mount for the boot bindings of a snowboard or the like, including a low profile housing with walls enclosing a cylindrical cavity, the housing bottom having a bore concentric with and smaller in diameter than the cavity, the bore being surrounded by an upward-facing annular surface, the housing top adapted for the mounting of a boot binding. A circular member for rotatably mounting the housing is secured to the snowboard and has a stem journaled in the housing bore and a larger diameter cap fitting in the housing cavity. The cap provides a downward-facing annular flange positioned opposite the upward-facing annular surface of the housing, and prevents upward movement of the housing from the snowboard. A circular locking plate rotatably mounted in the cavity above the top of the housing mount has a top surface characterized by a plurality of radially extending undulations, and the top wall of the housing cavity is provided with a similar undulating surface.