3b thread class right-hand 32 thread quantity per inch nut, plate, self-locking, miniature, corner type, plain base, 450 deg f nut only has rockwell hardness of rc 46.0 cadmium surface treated
3b thread class right-hand 40 thread quantity per inch nut material is brass, commercial half hard or equivalent. locking material is red nylon (350 degrees max performance) . cadmium surface treated