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Recent content by mechowie

  1. mechowie

    What purpose does reduced major dia fastener serve?

    Tmoose and screwman, I've come to the same conclusion. These bolts are really meant to be shear pins; the threads are turned down to provide clearance through tight MMC holes that one would want for a shear application. To allow for misalignment of two or more members would either require 1)...
  2. mechowie

    What purpose does reduced major dia fastener serve?

    Hi Screwman, Thanks very much. I think you're right that I may have mislead folks into thinking the shank or grip was the reduced part. However, this particular spec basically defines a full diameter shank and grip lengths out to 6+ inches. I think combining the thoughts of unclesyd regarding...
  3. mechowie

    What purpose does reduced major dia fastener serve?

    I have a question about NAS6304 bolts. Along with reducing the head height, these bolts have a reduced major diameter. I have a foggy recollection that these may be intended for internal UNJF threads. However, since the thread contact area (and hence friction) is less, applying a 'standard'...

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