95WNIFE aerospace tungsten bucking bar price which density is 18.0g/cm3 is 640.00USD/PC on Dec. 26, 2018. Tungsten bucking bar is a work tool used to form bucktails on rivets. It comes in many different shapes and sizes. The size and weight of the bar depend on the size and alloy of the rivet to be driven. Under certain circumstances, and for specific rivet installations, specially designed bucking bars are manufactured locally.