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What's the difference between pipe and tube?
The way it’s measured and the applications it’s being used for.

Pipes are passageways. Tubes are structural.
A pipe is generally measured by inside diameter or ID.(IE: You could roll a 2" golf ball through a 2" NOM pipe.) Tube, on the other hand, is measured by Outside Diameter. (So your golf ball would have the same O.D. as the 2" tube.)


A513 - TYPE 5 STEEL TUBE DOM

    Need a little help converting decimals to fractions? So do we. Click here or on the button on the left to convert this list to fractions or use our fraction conversion chart

See this category displayed in millimeters


SORT BY OD ID Wall
Please note that OnlineMetals.com will only guarantee OD and WALL measurements. ID (inside diameter) measurements are by reference only, and are therefore approximate!


A brief discussion of the difference between pipe and tube:
  • Pipe is generally more rigid than tube, and is usually produced in heavier wall thicknesses.
  • Pipe is specified by a nominal dimension which bears little or no resemblance to the actual dimensions of the pipe. 1" Schedule 40 pipe, for instance, has an actual OD of 1.32", a wall of 0.133", and an inner diameter of 1.049". Tube dimensions are actual dimensions.
  • Pipe fittings are sized to meet pipe sizes, but not tube sizes. A 1" schedule 40 nipple will fit correctly on a 1" schedule 40 pipe, but not on a 1" OD tube.
Click here for a tool specifically designed to search our pipe offerings, or scroll down to see the available items in this category.
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