Plug TapĪ plug tap has a less pronounced taper to the cutting edges. Bottoming taps are best used after a taper or plug tap has been used to cut the initial thread. Though this tap is extremely hard to start threads with, it is capable of cutting threads all of the ways to the bottom of a blind hole. Bottoming Tapīottoming taps have 1 to 2 tapered cutting edges before the full cutting force is engaged. The gentle taper of the cutting edge is the most forgiving when tapping by hand and allows for a straight hole to be cut in especially hard materials.Ī taper tap is rarely the final tap used before completing a project, however, as the taper leaves incomplete threads cut at the bottom of a blind hole. A taper tap is most often used as a starter tap for difficult blind holes. The distinct feature of a taper tap is the 8 to 10 threads that taper from the tip to the full cutting force diameter. This provides a very gradual and less aggressive cutting action. The taper tap can be identified by the visible and pronounced tapering of the cutting edges. There are two kinds of hand taps: taper tap and bottoming tap. The store-bought one performs much better. You will see that your money was a good investment. Compare hand tapping to that with thread taps from the store. These are common but are not for CNC work. You can buy hand taps from your local hardware store. With the information that we arm you with, you will have the power of making informed decisions to decide what type of thread tap you need. Types of Thread tapsīelow is a list of ten types of thread taps for you so that you know what they are for. So what are the types of taps? There are 3 main taps you should be familiar with and they are Taper, Plug, and Bottoming Taps. There are dozens of situations where having solid knowledge and appreciation for the science behind tapping threads into a piece of machinery can prevent hours of troublesome work and hundreds of dollars in replacement parts. Though this tool is most commonly used by machinists and engineers, automotive technicians may also have a tapping set in their toolbox. These are just a few out of many different thread taps.Ī tap is used to make (cut) new threads or clean out (chase) existing threads in a screw mechanism. There are many types of thread taps including hand taps, plug taps, spiral point taps, and power taps. However, threading produces external threads whereas tapping makes internal threads. Both threading and tapping produce screw threads. There is a difference between threading and tapping. Taps are also used to cut threads into a hole so that they will receive a bolt more effectively. Basically, taps are used to cut nuts and dies are used to cut bolts. A die, on the other hand, is a tool used to cut the male portions. 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.Thread taps are especially designed tools used to cut the female portion of a mating pair of metal fasteners. 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. 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.įorming taps must be applied in materials that cold form well. 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. In the right application, thread forming can boost quality and throughput
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