Used on t56 engine. 3b thread class right-hand 12 thread quantity per inch prop, shaft t-nut plate with tungsten carbide 17% cobalt area per eps 10414, plating to be 0.004-0.006 thick
right-hand 18 thread quantity per inch channel nut stud with spring stud nut grooves are serrated; weight/100 is 12 lbs; electro-galvanized finish; threads are unified