I would hope that some kind of standardized torque is used.  

From: Colin Stanners 
Sent: Tuesday, February 28, 2017 3:10 PM
To: af@afmug.com 
Subject: [AFMUG] PMP450 900mhz SM RP-SMA connectors nut torque

The PMP450 900mhz SM has the connectors on top of the radio, which worries me 
in terms of water ingress (can't really rubber tape the connector-case area)

One the first SM I tried, the nuts that tighten the weatherproofing were a bit 
loose - does anyone know how tight to put them? Don't want it too tight that it 
breaks solder on the connections after a few years of temperature cycling. 

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