OUTSIDE DIAMETER

When you order Square, round or rectangular tubes, the dimensions refer to outside diameter in mm

 

i.e.. Round Tube 25  x 1.5mm x 5.5m.... Outside Diameter is 25mm

 

INSIDE DIAMETER

When you order galvanised or black pipes, the dimensions refer to INSIDE diameter in mm i.e. Nominal Size Inc

 

i.e Galvanised pipe 11/2" x 2.5mm x 5.8m .

The inside diameter ID is approx ~ 38mm but the Outside diameter is approx ~ 48mm OD.

 

If you want the Outside diameter to be 38mm OD,

then you have to choose either Nominal size  1" or 1 1/4"  i.e ~ 34mm or ~ 42mm

Please refer to the chart below

 

Nominal Size inc    OUTSIDE DIAMETER in mm  ( OD mm )

         1/2"                               ~ 21mm

         3/4"                               ~ 27mm

         1"                                  ~ 33mm

         1 1/4"                            ~ 42mm

         1 1/2"                            ~ 48mm

         2"                                  ~ 60mm  

         2 1/2"                            ~ 76mm 

         3"                                  ~ 88mm  

         4"                                  ~ 114mm

         5"                                  ~ 141mm

         6"                                  ~ 168mm

         8"                                  ~ 219mm

         10"                                ~ 273mm

 

Disclaimer: The above diameters have a tolerance which the buyer needs to check on site.