Answer / shiva kumar r

The nominal dimensions of pipes are based on the inside diameter - ID and
The nominal dimensions of tubes are based on the outside diameter-OD..

Answer / indrajit agasty

In short: Tube is measured by outside diameter, pipe is measured by inside diameter. There is often confusion as to which size die the customer actually needs - Pipe Size or Tubing Size. Keep in mind that pipe size refers to a nominal - not actual - inside pipe diameter. Schedule refers to the pipe's wall thickness.

Answer / anantha babu

pipe is small one which is denoted by inside dia whereas Tube is bigger one denoted by OD

Answer / kiran0625

whereas in pipe there s tolerance on bothside while manufacturing. but strictly, tubes has only outside tolerance while keeping zero inside dia tolerance

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