Thread forming tap speeds9/24/2023 Thread forming can also eliminate the need for special taps to produce threads interrupted by longitudinal slots or cross-holes.Ĭold forming can provide multiple processing advantages versus thread cutting. But because thread forming produces no chips, it is especially well suited to tapping blind holes. Thread forming is useful for both blind and through holes, and can produce threads of any length. This list is longer than you might think, and includes wrought and cast aluminum and aluminum alloys, copper, brass, stainless steels, carbon steels, and zinc diecasting alloys. Generally, materials that produce a continuous chip when drilling are good candidates for thread forming. This includes light metals and light metal alloys as well as steels and other materials with tensile strength to 1200 N/mm 2 and hardness below about R C 35 – 40. (Northborough, MA).įorming taps must be applied in materials that cold form well. Tap designs have changed considerably in that time, and speeds up to 260 sfm (79 m/min) are possible with coated taps, according to Emuge Corp. Since the metal’s structure is cold worked along the thread profile, the threads produced are generally stronger and have a smooth, burnished surface finish.Ĭold forming technology has been used to produce threads for more than 100 years. Rather, the process displaces the material to generate the thread form. Unlike thread cutting, no material is removed during thread forming. For ductile work materials, thread forming can provide better size control and stronger threads while improving tool life and productivity. The vast majority of threaded holes–more than 90%, according to one supplier of taps and other cutting tools–are produced using cutting taps.īut many of those threads could be produced using forming taps, which can provide multiple advantages. Reaming helps control hole size but is not required.In the right application, thread forming can boost quality and throughput Straight pipe threads can be form tapped using only a high quality drilled hole. Straight hole procedure will reduce tapping torque and improve tool life. The benefits of burnished, high quality threads at the top of the hole provide excellent sealing capability for the part. The bottom of the hole may have partially formed crests with open “RABBIT EARS”. The straight hole method will result in a full, sharp-crested threads at the top of the hole. The Jarflo tap will ultimately produce the proper tapered thread by forming the material from the top to the bottom of the hole. Straight Hole – many applications for tapered pipe threads may use a straight hole.Tapered holes require the most torque and HP for tapping. Tapered hole may be drilled, reamed or cored. Tapered Hole – A pre-tapped tapered hole will result in a consistent percent of thread height the entire depth of thread in the piece part.There are two choices in the hole preparation for a Jarflo tapered pipe tap: It is not practical to thread form NPTF & NPSF threads because 100% thread is required, and the crests need to be fully formed. These benefits include improved thread finish, stronger threads, longer tap life, faster tapping speeds and no chips. Jarflo roll form pipe taps (NPT & NPS) have significant advantages over cutting taps in many applications.
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