We introduce how to use the common thread tap manual tapping. Today, we introduce the common knowledge and understanding of standard pipe thread tap.

　　Pipe thread tap, a tap is widely used in the attack, is used for pipe thread. Ordinary Sizhui attack ordinary screw teeth, tooth size is consistent, and pipe thread taper, so pipe thread tap is a taper. Because the thread angle is not the same, so the pipe thread tap tooth type with an angle of 55 degrees ordinary 60 degrees, the pitch is not the same.

　　Pipe thread tap points for general pipe thread tap, the short screw shaped push wire tapping, cast iron pipe thread tap, ductile iron pipe thread tap. According to the different requirements of application, we can choose different pipe thread tap.

　　Below to introduce the thread and the pitch of the relevant standards, in order to use as a reference.

　　Metric thread pitch, Britain and the United States of threads per inch thread number said; metric screw thread is 60 degrees equilateral tooth type, Whitworth is isosceles 55 degree tooth type, JIC isosceles 60 degree tooth type; metric thread metric unit （mm）， American and British thread with Imperial units, such as inches）； "insiders" usually "points" to refer to the size of the thread, an inch is equal to 8 points, 1 / 4 inch is 2, and so on. And ISO - 60 degrees standard metric thread; un - unified thread standard 60 degrees; API - American petroleum pipe thread standard 60 degrees; W - British Whitworth Thread standard 55 degrees; NPT BSP threads technology ---- the NPT and Pt, the differences between G thread NPT, Pt, G all kinds of thread NPT, Pt and G are pipe thread. NPT is an abbreviation for Pipe （American） Thread National, which belongs to the 60 degree taper pipe thread of the United States standard used in North America. National standards available for PT Pipe is the abbreviation of Thread GB/T12716-1991, is the 55 degree sealed taper pipe thread, is the family of the family of the Hui, more for Europe and the Commonwealth countries. Commonly used in the water and gas pipe industry, the taper is 1:16. national standard can refer to the G GB/T7306-2000 is 55 degrees non threaded sealing pipe thread, is the family of the screw thread. Mark G for cylindrical screw threads. National standards can be consulted GB/T7307-2001.