She asked if she can substitute a 0 ohm, 5% resistor for a 0 ohm, 1%. For this particular customer, the answer is no, as they do not allow unauthorized substitutions. But it got me wondering, how would you possibly quantify the acceptable tolerance range for a Zero Ohm resistor?
Just a thought exercise more than anything else I guess.
From what I have seen the tolerance for 0Ω items don’t really mean anything.
For some product the original item numbering did not include a callout for “jumper” or equivalent for that value. In that case they use a tolerance value callout already available in that series.
Resistor tolerances as a percentage are typically stated as the target value to which a given product series is produced. As nominal members of the series “zero” value resistors end up having the same figure applied, though their actual resistance is usually characterized as some maximum value mentioned in a datasheet footnote.