What is the purpose of the serration on these lug nuts?

[Ben L.]

Hi,

What is the purpose of the serration on the following lug nut?

These are used on Toyotas with alloy wheels.

Many thanks,

Ben

 

[TugboatEng]

It looks like they hold the washer in place.

 

[GregLocock]

Yup, the machining op can be called staking.

Cheers

Greg Locock


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[RobWard]

Is the washer free to spin?

"I love deadlines. I love the whooshing noise they make as they go past." Douglas Adams

 

[LittleInch]

All a bit odd, but looks very much like some sort of mechanism to hold the washer in place and not allow the nut to lose the washer.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[GregLocock]

It's a pretty standard feature on lug nuts for alloy wheels. Yes, the washer spins. The washer isn't essential to prevent galling, but it probably helps.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?