Good morning.

I am reviewing the suitability of serrated head screws in grounding and
bonding applications.  I am aware that these screws are good at resisting
vibration, but I've not seen them used for grounding and bonding purposes.

I question this application since, while the serrations oppose loosening
of the screw, they do not bite into the metal beneath the head and also
seem unlikely to form a gas-tight connection, allowing degradation of the
grounding/bonding interface over time.

What are your opinions?  Are you aware of any evidence of the reliability
of an grounding/bonding connection using such screws?

The screw will secure a wire, possibly with a crimp-on ring connector.  (I
also question the value of using a single toothed washer in these
applications.)


Regards,


Peter L. Tarver


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