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  1. rotta

    Met Blue Fasteners

    so there are no material properties etc that would differentiate metblue fasteners from the commercially available ones? i have an injection molding machine which is using these and couldn't find anything special about them. I am assuming i can substituew with a black oxide and be ok.
  2. rotta

    Met Blue Fasteners

    Can someone define what determines a Met Blue fastener?
  3. rotta

    Pneumatic Gas Driver for Pump

    I have a request for a pneumatic driver on a fuel transfer pump. The composition of the gas is what is throwing me: 67% methane, 17% CO2, 2% H2O and trace amounts of other hydrocarbons. I originally thought of an air motor type device but can't seem to find anything compatible with HC's that...
  4. rotta

    Coefficients of thermal expansion over different temp ranges

    I have found a reference which defines the coefficient of thermal expansion for a gray iron over several different ranges. The puzzler is why they all begin at ambient temp. Ex. 68-212° is 5.6 and 68-392° is 5.9. How can this be? What if the final temp falls in both ranges (195°) then you get...

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