We claim the ornamental design for a lug nut cap, as shown and described.
FIG. 1 is a top perspective view of a lug nut cap, showing our new design;
FIG. 2 is a front elevational view thereof, the rear elevational view, right-side elevational view, and left-side elevational view all being identical thereto;
FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image thereof;
FIG. 4 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a cross-sectional view thereof, taken along line 7-7 of FIG. 5.