On my coach the torque spec is stamped (Molded actually) into the washer attached to the nut.. Mine is also 450
however the torque spec may be different depending on the rig, I have seen different figures and I've not looked at all that many, it's a function of several things,, But check the "Washer" part of the nut... When they put it there, it is 1: Very clear (easy to see) and 2: very handy.
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