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Most tubes have more than this for thread depth, so it shouldn't be an issue.
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I agree that there's not a published agreed-upon length of "the standard" male/female thread interface. A quick google search shows an example of EA calling out exactly a half-inch (class 3) female thread, for instance:
The CGS mentioned in OP has a taper inside the silencer blast chamber to interface with their brand adapter: They assumedly made the female depth pretty long, but if someone made a really
realllly long male "HUB" thread, it
could run into that taper and end up leaving a gap at the end of the silencer and the HUB mount flange. (
*ETA Actually, I don't know if the CGS uses an 1.375 female thread in the can or not, or if that adapter is adapting some other thread pitch TO the 1.375 devices...update if that's the case.)
"The CGS QD Adapter still interfaces with the shallow taper on the Helios core... 1.375x24 pattern QDs from other companies sit on a normal 90 degree shoulder..."
The Rugged RUM, for instance, has a long protrusion poking into the can (and actually
looks longer than CGS female allowance – don't know if it is – or if the two diameters interfere or not, though):
vs. YHM Kurz: short as heck (eyeball measurement... ~six turns, but maybe a larger thread relief?)
vs. Dead Air Xeno: (eyeball measurement... ~eight thread turns?)
vs. a JMAC HUB device, obviously with a lot of brake material in front of the (class 2) 1.375 threads, but those threads are a good bit shorter than most others, maybe around... .300 long or so? Might be fine or desireable as they're going to
fit anyone's female tube, but conversely not have as much engagement as others.
Welp. No one said HUB was a standard. :)