![]() The range includes centertaps with and without lubrication flutes, as well as TIN and TiCn coating. The Centertap threadformer is a HSS-E tool and available for all common thread sizes as M, MF, BSP, UNC, UNF, etc. It is similar in principle to the rolling of external threads. Forming taps require a LARGER pre-tapped hole size than conventional cutting taps. In your case, tap drill hole size for 4-40 formed threads is about. ![]() Im trying a thread forming tap for the first time, hoping it will go faster than with thread cutting taps and with. ![]() Please note, the thread will be formed, no cutting! It is a chip- less process in which the material is rendered flowable and displaced from the thread root into the crests. The size of the bore hole diameter defines the extent of material deformation and thereby the minor diameter of the internal thread. I have to tap about (60) holes in aluminum 6061 for 4-40 machine screws. With thread cutting taps, the drilled hole size is the minor. The insert distributes the load across the length of the threads and improves the threads strength when a fastener with a standard screw thread size is installed in the hole. It is very difficult to achieve the desired thread minor diameter with thread forming taps. After producing the hole/bush we form the DIN-thread in second step. STI taps create an oversized thread inside a hole so a helical-coil screw thread insert can be inserted in the hole. Thread forming with centertap is the ideal completion of the flow drilling process. ![]()
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