Used on valves, bronze, 1/4-2 inch, union end gate. stuffing nut material is cast bronze; smaller diameter of nut (on top) is unthreaded, whereas the larger diameter of nut is threaded
3b thread class right-hand 32 thread quantity per inch nut, self-locking. plate-two lug, cap, flating, reduced rivet spacing comes with a stiffening flange dry film lube surface treated