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Sizes of tubes and pipes


Sizes and weights of seamless steel tubes
    European standards
    Russian standards
    ANSI/ASME B36.10M
    ASTM A450/A450
    Japanese standards (tubes)
    Japanese standards (pipes)
    Pipes for threading
    Linepipes
    Casing and tubing

Sizes and weigths of cold drawn tubes
    Heat exchangers tubes with minimum wall thickness (sizes in inches)
    Heat exchangers tubes with minimum wall thickness (sizes in mm)
    Sizes of multi lead rifle seamless tubes- internal ribs (MLRF)
Sizes and weigths of precision tubes
    European standards
    ASTM A 450/A 450M
    ASTM A/SA 999 - average wall thickness
    ASTM A/SA 450 and A/SA 1016 - minimal wall thickness
    Sizes of precision tubes for bearing rings
Size tolerances of precision tubes
    European standards
    Precision steel tubes with small tolerances
Sizes and tolerances of tubes for hydraulics and pneumatics
    Tubes for pressure lines - HPL tubes
    Tubes for pressure lines - zinc coated
    Tubes suitable for mechanical treatment - HPZ tubes
    Ready to use - cylinder tubes - HP tubes
Sizes and weigth of butt welding fitting
    Elbows accoding to European standards
    Elbows accoding to ASME/ANSI B16.9
    Reducers - Type K

Dimensions of tubes belong to the essential characteristics of tubes. In this regard tube dimensions must be given in such a way that can completely determine the tube. For tubes with circular cross section the three main dimensions except for the length are: outside diameter (OD), inside diameter (ID) and wall thickness (WT). For circular tubes are given two of these values. According to the type of tubes also belong the appropriate dimensions and the dimensional tolerances.

Dimensional series of steel tubes 

Dimensions of the individual tubes are not randomly produced, but are arranged according to dimensional series based on certain systems. Tube dimensions are in mm. In the USA and some other countries dimensions are given in inches (German "Zoll"). In this case, the tubes are divided into two groups so called TUBE. These tubes are used for mechanical usage and energy facilities and in inches are given dimensions of the outside diameter. PIPE are tubes for pipelines for different types of media. The PIPE sizes are given as the nominal tube size. For sizes up to 12 inches the approximate size (clearance) of the inside pipe diameter is given. From the PIPE dimensions after their conversion to millimeters, is created the first preferred line of the outer diameter of steel tube (1st line is in EN 10220, DIN 2448, etc.). This does not mean that the tube dimensions in the 2nd and 3rd series are not used. Dimensions in series 2 and 3 (for use in Europe are modified by the rounded off dimensions in mm) are standards for TUBE used in the construction of energy facilities and for tubes for mechanical application.


Sizes and tolerances of tubes for hydraulics and pneumatics

Series of wall thicknesses of steel tubes

 Series of wall thicknesses have its origin in the Imperial Unit system (inch), which for expression of sizes uses fractions. Wall thicknesses in PIPE are created by "Schedule" (40, 60, 80, 120 ....), connected in some dimensions to the weight class (STD, XS, XXS). These values, converted to millimeters form a part of series of wall thicknesses. (Note: size - the value of Schedule for example 40 is not constant, but depends on the outside diameter of tube).


For the Tube the wall thickness values are derived from the "scales" of BWG, SWG eventually others. After conversion into mm these values are another part of series of wall thicknesses for steel tubes. For the precision steel tubes used in Europe and in countries using the SI system the dimensional line is created with rounded off dimensions of the outside diameters and wall thicknesses. Tolerances for outside diameter, inside diameter and wall thickness are valid for two ordered values only. Tolerance of third dimension is possible to agree at precision tubes only.

Ovality of steel tubes


 (out of roundness), is the difference between max. and min. diameters readings taken in the same given section. Ovality shall be within OD tolerance.

Dimensions of tubes and pipes
(absolute value in mm)


(in %)


Eccentricity of steel tubes 

(mean deviation), is a measure of the distance between centres of the outside and inside diameters. Eccentricity shall be within WT tolerances and is calculated from the WT in one cross section using formula:

Sizes and weights of seamless steel tubes
(absolute value in mm)

(in %)

Tube straightness deviation (e) 

indicates the maximum deviation of the tube from a line joining its two ends, where L is the length of the tube. It is given in percentages per unit length. Usually required straightness is 3 mm for 1 meter.

Sizes and weigths of precision tubes
(in %)