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Like Relative said, original equipment strut shaft nuts are 21mm. I just whizzed 'em off with an impact gun since I was replacing the struts. All I cared about was the size of the new nuts, which on Bilsteins are 19mm. Pass-through set worked fine for that application. As far as proper torque goes, two items to note: 1) the fastener (as well as the strut) that I was installing was different than what I had removed so I couldn't very well assume that the OE torque values would be exactly the same, although they would probably be in the neighborhood. 2) The fastener is a Nyloc nut which is always going to require a greater application of torque than the nominal value due to the frictional drag of the nylon.
I just got them on good and snug and gave them one more pull for good measure -- we're not installing TTY head bolts here.
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