AlexJet

Have anyone mentioned that Toyota actually saving on disc brake studs.
I have 2001 with disc brakes front and drums on the back and 2005 with all 4 discs. I mentioned on both trucks that the length of the studs are way too short. I have aftermarket rims and on both trucks I have 5-1/2 turns on disc brake studs and 9-1/2 turns on drum studs. Why Toyota decided to save on the studs. They are missing of about ~1/4" of the length for an additional 4-5 turns.
Is it just my observation...?

DailyDrive

Steel aint cheap these days. Wait, it is.

Maybe it's a safety mechanism? They will strip before the disc get over-torqued.

AlexJet

It looks more of "glue" customer to use only original (non common) size rim and very narrow tire option....

waskillywabbit

iTrader: (-1)

Full thread engagement necessary is typically only enough threads for the thickness of the stud.

If yours are not engaging properly you have the wrong rims or the wrong lugnuts or both.

AlexJet

Transfering it to plain English, is it M12 means 12mm, 12 / 1.5 = 8 turns. AM I following you?

I have experience this iisue on 4 different Toyota trucks with 6 different aftermarket rims and 3 different lugs: 2001 4Runner, 2005 4Runner, 2005 Tacoma, 2007 FJ Cruiser; American Racing Baja, American Racing Chamber, ProComp 8089, ProComp 7105, Konig Heatsink, Ultra rims; McGard, Gorilla, MrLugNut lugs.

waskillywabbit

iTrader: (-1)

It means a 12mm diameter stud, M12, needs 12mm of thread engagement to be considered full thread engagement. Machinery's Handbook

Never had a problem with wheel studs or lug nuts on any Toyota except for DA POs using the wrong style lug nuts.

So are you having problems with wheel studs being too short or lug nuts coming loose or rims not fitting?

AlexJet

My concern is with all my experience for past 6 years and many Toyotas and aftermarket parts that I have 6 turns of the lugnut which is 9mm. I never had a fail because of that, but I always thought that studs are a little to be short. I'm using propper alloy wheels conical 60 degrees base lug nuts. I torque them to 90lb/in and they stay there even after hard wheeling for a week.
Just my findings which I wanted to share and see if any other have experinced such ones and if there are any options to work it out.

mt_goat

I was thought in mechanical design class the gold standard is 1.5 X diameter.

waskillywabbit

iTrader: (-1)

Based on your comments and measurements I still say you either have the wrong rims and/or lug nuts. Just because they will "fit" doesn't mean they are "right". Lots of aftermarket stuff "fits" but is not "right".

No OEM alloy or steelie has so little thread engagement and in the hundreds of Toyotas I have dealt with over the years I have never had a problem with lug nut thread engagement when using the proper lug nut on the proper rim.

Dale, if that were the case why are most nuts 1 width of the diamter of the bolt tall?

I got a M12 bolt/nut sitting on my desk here and the nut is exactly 1 width of the diameter of the bolt tall.

mt_goat

Good question, I guess it depends on how the connector is loaded with stress (ie tension or shear). Take a look at the top nut on a torsion bar adjustment bolt, its more like 2 X diameter.

waskillywabbit

iTrader: (-1)

Yep. Type of loading and loading per fastener determines everything.

Lug nuts have a huge safety factor considering load per fastener and taking into acount the number of folks who never check them ever. If it were a big deal we'd have wheels flying off everywhere.