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Discussion Starter #1
Question:
When spacers are used, how much thread engagement on the stud is needed for the lug nut to hold safely?

thanks.
 

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

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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
 

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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
 

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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 .
 

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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!
 

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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.

 

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Any cheap extended studs for NB's?
 
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