Please specify a bit, 10 finger tube diameter or outside diameter, screw thread is the pipe thread size, cone or cylindrical pipe thread?
For example: the nominal diameter of 100MM seamless steel pipe 102*5, 108*5 several, 108 for the outer diameter of pipes, 5 said that the wall thickness of the tube, therefore, the pipe diameter (108-5-5 = 98MM), but it is not completely equal to two times the wall thickness of the pipe diameter difference, it can be said that the public said the diameter is close to the diameter, but not equal to the diameter of a pipe diameter specifications on the design drawings, so we use the nominal diameter, the purpose is to determine according to the nominal diameter pipe, flange, gasket structure dimensions and connection dimensions, nominal diameter is represented by the symbol DN, if the diameter of in the design drawings, piping specifications should also make the table, show that the nominal diameter of a pipe wall thickness.
The diameter of the pipe can be divided into outer diameter, inner diameter and nominal diameter.The pipe is a seamless steel pipe pipe diameter by the letter D to represent, then additional outer diameter size and thickness, such as diameter of seamless steel pipe 108, a wall thickness of 5MM, denoted by D108*5, is also used outside said, such as De63 plastic pipe, such as reinforced concrete pipe, cast iron pipe, galvanized steel pipe, said the DN, in the design drawings is generally used to represent the nominal diameter, nominal diameter is a standard in order to design and manufacture and maintenance convenient set artificially, with nominal diameter, tube (or pipe) specification name. The nominal diameter of a pipe is not the same as the inside diameter and the outside diameter of the pipe,
Dg is the standard name, DN, is called Dg=DN, in standard GB, GB, Dg, DN are mm (mm), "Dg DN, the name is called" nominal diameter ", can be processed R 1/4" external tapered threadThe diameter of the pipe can be divided into outer diameter, inner diameter and nominal diameter.
