I'm curious about this. If anyone has reference to an actual 1/8"
connector, please forward off list. I don't recall them ever being
anything but 3.5mm. My recollection is that 3.5mm and 1/8" have always
been used interchangeably. I believe (guess) the discrepancy is simply
that the plug originated as 3.5mm and 1/8" is the closest fractional
inch (9/64 is unsatisfying).
Checking specifications from one reputable manufacturer calls out sleeve
diameter of 3.5+/-0.05mm for the plug and 3.6mm for the entrance of the
jack. As with so many things, I'm sure there's no difficulty finding
poorly designed/manufactured Asian parts that deviate.
There's no such issue with 1/4" phone connectors. They are called out
either as 6.35mm or 6.3mm, which is quite accurate because they
originated as the fractional inch dimension.
73,
Josh W6XU
On 4/7/2014 7:11 PM, Don Wilhelm wrote:
3.5mm and 1/8 inch are now the same thing - one place calls them 3.5mm
while others use the 1/8 inch designation for the same thing.
Yes, it was not always so, but that was well before stereo plugs and
jacks came into existence.
The big issue now is manufacturing tolerances that might mean some
jack and plug combinations are tight while other combinations may
appear to be sloppy.
1/4 inch plugs and jacks are more tolerant of sloppy tolerances i.e
+/- 0.01 mm compared to 3.5mm is much greater than +/- 0.01 mm
compared to 7 mm (or is it 8mm?).
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