18 nut thread a thread quantity per inch stud, straight, vented, .3125-18 x .3125-24, 180 ksi, special material: alloy steel 4340 per AMS6414 or 8740 per AMS6322 or AMS6325 or AMS6327, heat treatment 180-200 ksi ultimate tensile strength per AMS2759, finish: chemical black oxide per mil-dtl-13924 oxide surface treated
1.280" overall length stud, straight, vented, .3125-18 x .3125.24, 180 ksi, special material:alloy steel - 4340 per AMS6414 or 8740 per AMS6322 or ams 6325 or ams 6327 oxide surface treated