Lug Nut Mystery

Dig-Dog · 2017-07-13T01:58:30+00:00

So, a few months ago I rotated my tires, and at that time all of my lug nuts were 21mm in size. I recently took my 4Runner into the dealership for state inspection/emissions testing. Tonight, I was rotating my tires. All went well until I got to the passenger front wheel where two of my lug nuts are now mysteriously 22mm in size. Could the tech at the dealership have grabbed two lug nuts from another vehicle (such as a Tundra which I know are 22mm)? This is blowing my mind! Sent from my iPhone using Tapatalk

Thread starter Dig-Dog
Start date Jul 13, 2017

NorthwoodsRunner

New member

Jul 26, 2017

1000MPH said:
A 13/16" 6 pt deep spark plug socket has worked well for me. It's actually slightly smaller than 21mm (.8125 vs. 0.8268). I've got one that has both measurements inscribed on it.
IIRC I've heard most lug nuts are purposly sized in SAE equivalents: 17, 19, 21, & 23 MM or 11/16, 3/4, 13/16, 7/8.

Indeed! A 13/16" is a tighter fit compared to 21mm for Toyota applications and a 3/4" is a better fit compared to 19mm for my Hondas. I would use a 13/16" to further minimize lug nut swelling issue.