Product detail :
Inside of the steel cap 48.5 mm
To Fit Pipe size outside Diameter 48.5mm
Galvabond Round 40NB End Caps
Inside measument is important to move volume and wall thickness is important for pressure
Galvabond Round End Caps (40 mmNB)to Fit Pipe outside Diameter 48.5mm
Galvabond Round End Caps 40mm Nominal Bore. Part Number CP 544, Great for finishing off edges on Gate post, Round Tubing, Steel tube, Rail etc. Steel Caps can prevent dirt, water and dust gathering inside the tube, Push over application for tight fit. Material: Galvabond Steel
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Confusing isn't it.
Pipe is measured by inside diameter.
Tube is measured by outside diameter.
Pipe is used to transport fluid so inside diameter and wall thickness is important to calculate speed and volume
Tube is used to construct something and hence we measure outside diameter and wall thickness for strength.
In most cases you are capping a Pipe and the inside measurement is not important if you can measure the outside diameter and select the cap that way.
More then ever Galvanized round pipe is used for fencing and post and people will still use pipe not tube.
Outside measument is important for strength, thickness is also important for strength.