Studbolts with 2 heavy hexagon nuts 1/2"100MM,UNC,B8T,8T Length: 100mm Inspection, Certificate: ISO 10474-3.1B Material stud bolts: ASTM A193 GR. 8T Material nuts: ASTM A194 GR. 8T Design Standard, Nut: ASME B18.2.2 Design Standard, Stud Bolt: BS 4882 Size: 1/2 IN Thread Class Symbol, Bolt: ANSI B1.1 CLASS 2A Thread Class Symbol, Nut: ANSI B1.1 CLASS 2B Type of Thread: UNC (13 TPI) Quantity: 48 pcs.