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  1. quattro

    nut size info needed

    Madmango: Thank you for a quick response. While searching the Net, I also came across the same Glenair page. This is not really a plain nut, but some kind of attachment for a specific connector. I was looking for a standard nut dimensions. Regards, Efraim
  2. quattro

    nut size info needed

    Could somebody tell me what is the width across the flats for 15/16-20 UNEF nut? I can't find this info anywhere. It would also help if somebody suggested the place to buy this nut. Preferred material is plastic, but it could be steel or aluminum, too. Thnks in advance. Efraim G.
  3. quattro

    Sheet Metal Design

    This one is a comprehensive book: Handbook of Metal Forming by Kurt Lange. ISBN 0-07-036285-8. HTH, Efraim
  4. quattro

    Shear stress

    Shear stress value is usually 60% of the specified yield stress. This applies to metals. I can't help you with wood or plastic. HTH, Efraim
  5. quattro

    stainless steel fasteners for high current terminations

    Thanks all those who answered my question for your help. Efraim
  6. quattro

    The history of the "mil"

    To Ivymike: How about 0.005" dia drill bits? They are being used everyday by all North American PCB (printed circuit board)manufacturers to drill holes in substrates for multilayered boards. By the way, they call them 5 mil holes. Efraim
  7. quattro

    Which 3-D Cad Software is Best?

    Very interesting thread. As one guy here who posted his response here rightfully stated, you should choose your tool to work best for you application. He was right, there is no "one size fits all" thing except for pantyhose. Our company manufactures electronic equipment so most of the...
  8. quattro

    stainless steel fasteners for high current terminations

    Thank you for your help. Maybe I should have stated the question more clearly. We had a SS PEM nut pressed into the plated through hole in PCB and then wire terminal carrying 15A was placed on the top of the PEM nut thus current was flowing through the fastener into the trace on the board. The...
  9. quattro

    drill and tap bolts

    The rule of thumb is to have wall thickness (depth of the tapped hole) equal to the height of the nut to maintain the same length of engagement. If this condition is met then there is no difference between bolt/tapped hole and bolt/nut application. In your case, you have 5/16" wall...
  10. quattro

    bolting aluminum to mild steel

    To Butelja: You and JLAU are talking about two different applications. In his case, I presume, relatively large aluminum parts are bolted with SS fasteners. Yours is an opposite case, SS parts are larger than aluminum parts. Aluminum is anodic and SS is cathodic. The larger the cathode, the more...
  11. quattro

    stainless steel fasteners for high current terminations

    There is a theory that stainless steel fasteners should not be used in high current (15A+) wire terminations, for example attaching a crimped ring terminal to the stainless steel PEM nut installed into PCB or using a stainless steel screw. True or false? Thanks.
  12. quattro

    Welding w/o warping

    I am not a welder, but I designed and supervised welding of large 6061-T6 aluminum structures for radiocomm antennas. We successfully used "clamping until cool" method as you described it. It worked well provided parts were properly jigged. Efraim
  13. quattro

    Spot Welding Aluminium

    Utility grade aluminum is quite soft to start with. Welding will further reduce the strength in the area of welding to approximately 60% of its nominal strength. If structural integrity of the joint is important, welding is not recommended. If it has to be welded, make sure you thoroughly test...
  14. quattro

    stainless steel fasteners use for high current PCB

    There is a theory that stainless steel fasteners should not be used in high current (15A+) wire terminations, for example attaching a crimped ring terminal to the stainless steel PEM nut installed into PCB. True or false? Thanks.

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