The ornamental design for a replaceablejaw for a shear, as shown and described.
FIG. 1 is a perspective view of a replaceable jaw for a shear showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is bottom view thereof; and,
FIG. 8 is a perspective view embodying the utilization of replaceable jaw for shear in which the broken line is for illustrative purposes only and forms no part of the claimed design.