HSS Fluteless (Roll Form) Taps. Fluteless taps are also referred to as “Roll Form” or “Thread Flow” taps. Unlike standard taps, fluteless taps create internal threads by pressure deformation, rather than by material removal. As a result, no chips are formed as no material is removed. The thread is formed by the tap in the ductile material creating threads that have a smoother surface and greater tensile strength under dynamic stress than cut threads. It is essential to use a high quality lubricating fluid when using fluteless taps. Materials with a minimum elongation of 5% and a tensile strength no greater than 1,000 N/mm2 are suitable for thread forming. Metric Coarse angle of thread is 60 degrees. The crest is flat and the thread has clearance at the root allowing external thread and internal thread to engage well. Larger root radius and lower thread height enable easy screw thread processing and increase thread screw strength. Recommended tapping drill: 9.3mm
