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    • Member Info
      • Native Language:
      • Persian
      • Home Country:
      • Iran
      • Current Location:
      • Iran

    • Join Date: Jan 2013
    • Posts: 563
    #1

    Lightbulb i.d. ?

    Hi,

    Anyone knows to tell me what does "i.d." refer to in the below expression?


    The tubes 33 mm and 25 mm i.d.

    Does it means "inner diameter"?

    Thanks

    • Member Info
      • Native Language:
      • American English
      • Home Country:
      • United States
      • Current Location:
      • United States

    • Join Date: Apr 2009
    • Posts: 12,312
    #2

    Re: i.d. ?

    Yes, inside diameter. As opposed to OD, the outside diameter.

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