[WOT]

Question:
When spacers are used, how much thread engagement on the stud is needed for the lug nut to hold safely?

thanks.

 

[drummersrs]

I am currently running an 8mm spacer on normal length studs.In my opinion it looks a little sketchy but has worked so far.

 

[horribleR]

I would suggest at least 8.

 

[adamvanxxx]

I would only run spacers with extended studs, but it's your car/life.

 

[DIYroadster]

A general rule is 1.5 times the diameter of the bolt.

Im currently running a 1/4 inch spacer all around on stock studs and that would be the max that I would feel comfortable with before getting extended studs.

Narek

 

[miata_racer]

5mm is pushing it on stock length studs. Spend more $$$ and get longer studs. For 1.6 cars get 93+ f body studs from jegs CHEAP

 

[imput1234]

I would only run spacers with extended studs, but it's your car/life.

What he said.

 

[Venice]

6 full turns on the lug nut and you will be fine for daily driving . Just make sure there torqued down . Depending on the wheels your running you might have to trim your studs to run anything below a 20mm bolt on adapter .

 

[zoomzoom365]

I'd agree with DIYroadster's suggestion...the engagement should be 1.5 times that diameter of the bolt/stud. That is an industry accepted value...and not just for wheels!

 

[Edough]

I'm surprised that there's good information here. 1.5 is what you should be shooting for. Coincidentally, one of my courses this term has a section based on bolted connections. You might also find this interesting. It shows how the load is distributed on the first several threads. You can see there is a point of diminishing returns.

 

[Andrew6691]

Any cheap extended studs for NB's?