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  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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