Keystone Fastening Technologies (also known as Keystone Stud Welding Technologies) is a company that specializes in creating stud welding and specialty fastening solutions. It includes weld studs and fasteners, capacitor-discharge equipment, Drilling and Tapping Systems drawn arc equipment, drawn arc accessories, and other products. The company also offers custom stud welding and equipment services and caters to aerospace, industrial equipment, marine and boating, medical, military, and other sectors.