The term “threading” refers to temporary connections that can be very easily disassembled. Threadings’ parts are usually held together by either sheer friction or physical obstacles.
Threading is a kind of mechanical construction used to create a helical structure out of two elements, which is called “thread”.
Threads are built either on the outer side of cylindrical and conical elements (screws) or on the inner side of components (nuts). Then, screws and nuts are screwed together.
Threaded components can be used for two main purposes:
Threading makes use of many components whose dimensions may vary according to the reference standard. The main ones are:
How do you create a thread?
Threads can be created by means of different methods. The most widespread rely on lathes with single head utensils, taps and dies, rolling by means of plates or rolls, multiple cylindrical and conical milling machines.
The main types of threading are ISO metric screw thread, Whitworth thread, GAS thread, GAS NPT, trapezoid, sawtooth. In the next article GAS and GAS NPT threading – used in the hydraulic sector –and their dimensional differences will be analysed.