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  1. #1
    Join Date
    May 2013
    Post Likes

    Are all DFS (duct free split) flare nuts metric?

    Here is something that I have been working on today. I would like to ask for more opinions from the peanut gallery.
    We make a torque wrench tool kit, TW-8 for use in the HVAC market. These are primarily used for properly installing DFS equipment flare connections.
    Since all DFS equipment is designed and manufactured outside of the USA, (please correct me if I am wrong here) wouldn't all the flare nuts be metric?

    I looked at all the similar tools on the market, they are all in metric. OK CPS says they have one in SAE but its just the imperial/SAE size closest to the metric that it actually is.
    I ask this because we have some requests for a ft/lbs torque wrench. That is no problem, but what about the changeable wrench heads that fit on the end of the torque wrench?
    Should they be in imperial/SAE also? If so, which sizes?

    I'm thinking all the flare connections on DFS are metric........ so just leave that part of the TW-8 kit alone and just fix the ft./lbs. scale on the torque wrench body.
    However, I am not sure that all the DFS flare nuts are metric, can you guys offer some advice here?

    I'm getting torqued up here...

  2. #2
    Join Date
    Jun 2016
    My house
    Post Likes
    I know the threads, and tubing are s.a.e. here in America. Becouse Noone would buy 8mm copper tubing. Regarding the nut sites please. Label them 1/4 3/8 5/8 etc and then also label on them or close to metric sizes that seem or look close
    becouse we are to arrogant to learn and use metric system effectively. I promise you if like products were sold side by side on display nobody would buy the one in metric . Regarding a tourq wrench for line nuts, I have one and used it once or twice. I know the manufacturer says to but that's becouse of the inexperienced installers over tightening them because they leak after making a inproper flare or they are using cheap Chinese tools and Chinese compression nuts that came on the Roll of copper after you make a hundred or something compression flares you know how tight to connect them by intuition

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