Tap Set – 5/16-18 Smallest Thread Size, UNC, 5/16-18 Largest Thread Size, High Speed Steel, Bright Finish, 4 Flutes | 04471215

04471215 04471215 5/16-18 H3 SET/3 HSS P 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.