... parts, hardware tools, straight shank twist hot upsetting, hot. 16mm diameter, round steel, heat about 3-5 seconds, can be extruded. B ... , pliers and various types of shafts, cams, sprockets, gears, valves, ball pin and large machine tools and other hardening guides and ... upsetting. keep the hot cutting. it circle steel of the diameter 16 mms. heat 3s-5s or so proceeding to squeeze ...