I have a new 2016 F350 PSD CC LB SRW King Ranch with 20" wheels.

What is the correct Socket size for these Lug Nuts ?

Also, what is the correct torque value for these Lug Nuts ?

 

Did you read your owner's manual?

See page 301.

Socket size for my 2015 dually is 3/4" might be same for you. Just try a socket and see. Is probably a metric size.

 

Yes it says 165 ft/lbs

It doesn't say anything about socket size for SRW or DRW.

 

21mm socket

 

21mm at 165 ft lbs. I'm kind of narotic so I torque down in stages. I go from air ratchet tight (too many lugs and threads to turn everything by hand) to 115 ft lbs all around and then finally down to 165 ft lbs all around.