5/16-18 UNC, 4 Flute, Bottoming, Plug & Taper, Bright Finish, High Speed Steel Tap Set – 2-23/32″ OAL, 2B/3B Class of Fit | 02385334

02385334 5/16-18 UNC, 4 FL, BOTTOMING, Bottoming chamfers have 1 to 2 threads Plug chamfers have 3 to 5 threads Taper chamfers have 7 to 10 threads and are typically used as a starter tap They all can be used for threading blind holes.Bright provides a smooth, polished finish on the tool It increases chip flow in softer materials such as aluminum, wood and plastic.High Speed Steel (HSS) provides good wear-resistance and can be used in general purpose applications for both ferrous and non-ferrous materials.