Question Regarding Thread Sizes

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  • IanDMacDonald
    XS-XJ Super Guru
    • Oct 2010
    • 3918
    • Grand Blanc & Fenton, MI
    #1

    Question Regarding Thread Sizes

    So, again I purchased another pair of air shocks. To my disappointment, the fitting thread size is not the same thread size as the CB1000 air shocks. So, I do some researching and find that the schrader valve size is 1/8" NPT. What??? I measure the thread size of the bolt/plug, and see it's 25/64, closest size down is 3/8". I don't find any 3/8" Schrader valves. So . . . I come to the realization that I have no idea what to think.

    Does NPT threads measure differently than normal standard vs. metric threads?
    1979 XS1100F
    2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
    Tags: None
    • DiverRay
      Moderator
      • Nov 2004
      • 7694
      • Star, IDAHO
      #2
      YES!!! The NPT stands for National Pipe Thread, IIRC. Pipes measure by inside diameter, NOT outside like EVERYTHING ELSE! You should be able to find a fitting to go from the NPT to schrader, but I'm not sure about it. The other thing is to run nylon tubes between the shocks, and put a schrader valve someplace on the tube. That I KNOW can be done.
      Ray Matteis
      KE6NHG
      XS1100 E '78 (winter project)
      XS1100 SF Bob Jones worked on it!

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