Capacitor Discharge Studs or CD Studs are special studs that are used with a Capacitor Discharge Stud Welding Machine.Capacitor Discharge Studs comes in dierent sizes ranging from M3-M10 ( 3 mm to 10 mm of stud diameter) and all available lengths. They are available in Stainless Steel(SS), Mild Steel(MS), Aluminium.