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Torque on 3.5 mm connectors for a one-off connection

Question asked by drkirkby on Oct 21, 2015
Latest reply on Nov 1, 2015 by drkirkby
I know the recommended torque for 3.5 mm connectors is 8 lb inch, and that is what I use. I have a couple of torque wrenches - one from an 85052B cal kit and the other an 85033E cal kit. Although neither are recently calibrated, they are both pretty much similar, so I don't think either are considerably out. 

I am currently stripping down an 8515A 26.5 GHz S-parameter test set, with a view to making a frequency extender for an 8753. All internal connections on the 8515A are 3.5 mm. I find there's no possible way any of these connectors could be removed with an 8 lb inch torque wrench. The torque wrench would start to bend well before there was any movement on the connectors. HP seem to be tightened them considerably more than 8 lb inch. I noticed the same with some 2.4 mm connectors that I recently undone in an 8720D VNA. 

I'm wondering if HP had any rule that for internal connections, where connectors would expected to be made only once, that a torque well above 8 lb inch was used. 

Dave  

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