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A tap is a standard tool used to process cylindrical and conical internal threads. The taps are basically classified into: hand taps and machine taps.
Hand taps refer to carbon tools or alloy tool steel rolling (or cutting) taps, which are suitable for manual processing. They are directly operated by hand with a tap wrench and are suitable for some metal processing with relatively low hardness or in environments with low workload.
Hand taps usually appear in sets, and the most common ones are three-taper sets and two-taper sets. The three-cone set can be further divided into: head tap (head tap), two-cone (two-cone tap), three-cone (bottom tap); the two-cone set can be further divided into: head tap (head tap), two (two-cone tap)
Why is the hand tap a three-cone set? First, the head tap taps out the outline of the thread, the two-cone makes the thread smoother on its basis, and the three-cone taps the thread more delicately, so that the screw can be screwed in easily! Therefore, hand taps are available in sets of multiple sets. Simply put, using a hand tap is a delicate job, tapping again and again to use the thread to achieve the best state.
Specifications of hand taps:
1. Metric coarse thread, generally regulated in the form of (Mxxx.xx)
2. Metric fine thread, also regulated in the form of (Mxxx.xx). Compared with metric coarse thread, the pitch of fine thread tap is smaller, that is, the difference of x.xx.
3. G pipe thread, also called Whitworth pipe thread, regulated in the form of Gx/xxX. (x/x is a fraction) 4. BSW thread, also called Whitworth coarse thread, regulated in the form of x/xxX. ( x/x is a fraction), the difference between it and G pipe thread is simply the different thread standards, and the easiest way to distinguish is to use G.
5. BSF thread, also known as Whitworth fine thread, is only different from BSW thread in thickness
6. American coarse thread
7. American fine thread
8. Trapezoidal thread
The material of hand taps is usually HSS (high-speed steel). For hand processing, the hardness of HSS high-speed steel is suitable for materials with a strength of 1000N/mm?, which can meet the needs of most work.