According to IFI-128, note 7, the hole should be located at mid nut thickness and have a diameter of 0.2 to 0.4 times nominal nut size for sizes 2-1/2â³ and smaller. For sizes 2-3/4â³ and larger, the hole is 1â³. Coupling nuts are manufactured without this hole unless otherwise specified.As long as the correct grade of coupling nut is used and the bolts or rods are engaged a minimum of one diameter, the bolt should theoretically break before the threads strip.Again, this is only a common rule of thumb and we have no documented specifications that cover this issue.nfortunately there appears to be no documented information on how much rod engagement into a coupling nut is required to achieve the strength of the rod or bolt being used with it.
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