Stay rod for a high pressure oil field pump

FIG. 1 is a perspective view of a high pressure oil field pump having an upper and a lower stay rod for a high pressure oil field pump mounted thereon, the high pressure oil field pump being shown in dotted lines as not forming a part of the presently claimed invention;

FIG. 2 is a front perspective view of a stay rod for a high pressure oil field pump of the invention, showing three of the fluted surfaces thereof, the remaining three fluted surfaces on the rear being mirror images thereof;

FIG. 3 is a top end view of the stay rod for a high pressure oil field pump of FIG. 2 ; and,

FIG. 4 is a bottom end view of the stay rod for a high pressure oil field pump of FIG. 2 .