Thread: Drill bit size for copper pipe union?
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Doug Miller Doug Miller is offline
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Default Drill bit size for copper pipe union?
In article unications, (Robert Bonomi) wrote:

Plumbing stuff is specced by inside diameter.

Incorrect.

O.D. is whatever the manufacturer feels like.

Incorrect.

Pipe is specified by OD; the ID is determined by the nominal OD and the wall
thickness.

Think about it: if OD were "whatever the manufacturer feels like" you wouldn't
be able to use Manufacturer A's fittings with Manufacturer B's pipes. It's
precisely to ensure such interchangeability of pipes and fittings across
brands that the sizes are specified by OD, not by ID.
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