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American Thread sizes?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by JORGE, Apr 18, 2002.

  1. JORGE

    JORGE 1/2 ton status

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    Hello,
    I,m looking the way to install a Isppro temperature gauge in my 6.2, but i,ve a trouble.I would need to change the sender by a isspro sender too,and i don,t know what is the correct.
    The original sender on my 6.2 engine,has a 17mm diameter and a 1.5 wide ,but in the metric sizes doesn,t exists the M17X1.5,it pass from M16x1.5 to M18X1.5. Maybe this sender size corresponds to any American thread size,that i don,t know.
    If somebody could to help to me i would to thanks to him.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    It's probably tapered pipe thread. I don't have a chart handy here to confirm that though. 17 mm seems like it would be awefully close to 3/8" pipe thread...

    rene
     
  3. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    If you are plumbing into the block it is going to be pipe thread.Pipe thread and regular threads are different.
     
  4. JORGE

    JORGE 1/2 ton status

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    Do you want to mean if i checking the hole size,in the block?
    No,im checking the sender size,But if its possible you have reason.If the sender has 17 mm,the hole can to be a 16 mm.
    I,dont know.
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The sender unit going into the block will use tapered pipe thread. Also known as NPT. From your size description I'd say it is 3/8 NPT...

    Rene
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    Yes, 3/8 NPTF. Not to be confused with 3/8 BSPT (British Standard Pipe Thread). 3/8 NPT is 18 threads per inch, and BSPT is 19 threads per inch. The world is a confusing place.
     
  7. JORGE

    JORGE 1/2 ton status

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    Yes,The Isspro sender is 3/8 Npt, I have found and article wich says that all the GM engines,since 1980 have 1/2 to 3/8 senders.Thanks for all.Your help has been very valuable.
     

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