When producing fine threads, precision is particularly important. Especially in the manufacturing of high-quality watches or instruments in the aerospace industry, production cannot do without the MF thread former. The designation "MF" stands for metric ISO fine thread and is a smaller version of the standard metric ISO thread M. While both thread types have a flank angle of 60 degrees, they differ in the pitch parameter. Since chip formation is unavoidable when using thread cutters or various thread taps, these threading tools are unsuitable for many high-precision manufacturing processes. The solution in these cases is the thread former or thread roller, which creates a thread through cold forming.
Even without considering chip formation, thread rollers and thread formers MF are often the better choice compared to thread taps, as they generally have a significantly longer tool life. Additionally, tools with HSSE alloys are made more heat-resistant by the addition of cobalt and have overall greater hardness. However, they are also somewhat more brittle and can break more easily than comparable thread taps or cutters. In addition to the longer tool life, the primary advantage is undoubtedly the chip-free thread production.
If you plan to use an MF thread former, the material of your workpiece must allow for cold forming. Cold formability is the key criterion. The following materials are particularly suitable:
If you are unsure whether your material is suitable for cold forming, feel free to ask us. We provide not only MF thread formers but also M variants, each available in HSSE versions if needed. During thread creation through cold forming, the pressure flutes of the thread rollers push the base material to the side. Threads created in this way are distinguished by a very smooth surface structure that cannot typically be achieved with conventionally produced internal threads. While a thread former also boasts a longer tool life, it cannot be resharpened like a thread tap. It is especially important that the core hole for the thread roller is carefully and precisely drilled.
