lug nut bolts for my Cayman

[look 171]

Put on new tires and the guys at the shop lost one of my lug bolt to the Cayman. I am having a hard time locating one locally, new or used. Off to the net I go only to found upon delivery that the new one's ball seat are much smaller. I can't seem to find any over the net (I suck at searching). Dealer? No need for titanium, shiny polish alum, or stainless lug bolts. I also discovered that the original bolt's bite is only 5 to 6 threads or just under 1/2" and there are wheel spacer behind the wheels. Factory 19" wheels, its an S. Where do you guy get your?

I am not sure where or how its measured? I assume the length is measured from the end of the bolt to the top of the washer just right under where the hex head starts?

I think I am looking for 55mm length, 14x1.5mm lug bolt?

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Oops, forgotten about our host. Just looked.

[JackDidley]

I think I bought 4 from PP when I first got my Cayman. Replaced the locks. Hate those things.

[A930Rocket]

A 1/2” engagement? That doesn’t seem like a lot, but then again, isn’t the rule the width of the bolt?

Either way, I’d like to have more.

Is the spacer a factory item?

[look 171]

Originally Posted by A930Rocket

A 1/2” engagement? That doesn’t seem like a lot, but then again, isn’t the rule the width of the bolt?

Either way, I’d like to have more.

Is the spacer a factory item?

Not sure? I like to have a little more bite on those bolts also. Hard to find 50 mm ones with the bigger head. I suppose the smaller round head on those cheap bolts will do.

Yep, hate those locks

[David]

There are plenty of sources for good aftermarket Porsche bolts with the proper sized spherical washers and in all different lengths. Like Pelican or ECS

[1990C4S]

'Proper' engagement is 1.5x diameter as a rule of thumb. I suspect a lug bolt has such a big safety factor that 1.0x is fine, but I would prefer the 1.5 rule be applied.

M14 should have 21mm of engagement if possible, at 1/2" you would be under the1.0 rule.

Thread length is almost always from the bottom of the head, i.e., the real thread part.

[onewhippedpuppy]

Just don't go too deep. Not sure about the Cayman, but some cars have through holes that can actually hit the hub or knuckle behind. Typically wheel spacers more than 5 mm will require longer lug bolts.

[Zeke]

Remove the wheel spacers? If you have factory wheels I think Porsche engineering probably has the wheelbase spacing about right.

[onewhippedpuppy]

They could be stock. I've had several Porsches that were factory optioned with 5 mm spacers.

[look 171]

Originally Posted by 1990C4S

'Proper' engagement is 1.5x diameter as a rule of thumb. I suspect a lug bolt has such a big safety factor that 1.0x is fine, but I would prefer the 1.5 rule be applied.

M14 should have 21mm of engagement if possible, at 1/2" you would be under the1.0 rule.

Thread length is almost always from the bottom of the head, i.e., the real thread part.

Thread length, got it, thanks.

[look 171]

Yep, 5mm spacers