Need help finding left hand thread bolts!!

[openwheeler37]

I'm looking for a left hand thread M12 x 1.75 x 80mm bolt. I have tried Fastenal but they do not have and none of their suppliers stock them. Anyone know of a good source for metric / specialty bolts? Any help is appreciated!

[stonebridge20]

You've tickled my curiosity. In nearly 45 years of turning wrenches on pretty much anything with wheels, I've never needed a left hand thread bolt.
Please tell me what this bolt is for.

[openwheeler37]

You've tickled my curiosity. In nearly 45 years of turning wrenches on pretty much anything with wheels, I've never needed a left hand thread bolt.
Please tell me what this bolt is for.

It's the front left hub bolt that secures the hub to the wheel bearing / upright.

Sent from my SM-G965U1 using Tapatalk

[BeerBudgetRacing]

It's the length (and probably socket head) that gets ya..... 50mm is about it.

https://www.mcmaster.com/#90605a342/=1dsc1b4

Call ARP.
https://arp-bolts.com/p/contact.php

[Rick Kirchner]

Try Bel-metric or Baller bolts. If they don't stock it maybe their suppliers do.

sadly, maryland metrics went out of business.

[petawawarace]

Any competent machine shop should be able to make this up for you. Might need to be a hex head instead of a cap screw though.
And its going to cost a bit of coin.

[924RACR]

+1 for Bel-Metric...

[Bob L.]

If hex head won't fit space:

Take correct LH hex headed bolt (from Belmetric), get another (RH) with allen head, .....cut off allen head leaving a short bit (1/16-1/8"?) of shank, counterbore head of hex bolt for pilot on shank, vee back side of allen head, then weld together.... machine hex off after welding if needed for clearance.

Only thing head will be doing is allowing installation...hex remains provides the mechanical retention...weld only has to provide attachment/drive for installation/removal....

Not ideal, but probably will do the job.

Bob L.

[kea]

What make vehicle/model are you working on ?

[BURKY]

What make vehicle/model are you working on ?

Looks like a Speads upright.

[RussMcB]

Sometimes you can find odd fasteners on ebay. It may take a few tries to get the right search words. Look for patterns of hits to find different terms sellers use.

[jchracer]

Still confused. Why do you need a left hand thread on that fastener? A properly designed and torqued fastener should perform properly regardless if thread hand.

If it's an intended safety feature where the nut will tighten if the bearing seizes, I would just switch to a RH thread. If the bearing seizes, the nut loosening will be a minor issue compared to all the other problems. JMO.

[J Leonard]

It's like having left and right hand threads on wheel retaining nuts, like on indy and big IMSA cars. If RH it try's to unscrew. No amount of loctite or fancy nuts work.

[Bob L.]

It's like having left and right hand threads on wheel retaining nuts, like on indy and big IMSA cars. If RH it try's to unscrew. No amount of loctite or fancy nuts work.

Amend to that! Personal experience with it not done.....(someone in past modified axle housing, changed LH > RH, lasted 20 + yrs, til last seal replacement.... not good .....bent a really trick axle... wheel/axle just missed spectators..)

[BURKY]

Looks like a Speads upright.

Call Richard @ http://www.rilltechracing.com
He might have what you need.

[openwheeler37]

Call Richard @ http://www.rilltechracing.com
He might have what you need.

He was my first call. He's all out and doesn't know if / when he'll get more.

[problemchild]

Amend to that! Personal experience with it not done.....(someone in past modified axle housing, changed LH > RH, lasted 20 + yrs, til last seal replacement.... not good .....bent a really trick axle... wheel/axle just missed spectators..)

When an assembly works fine for 20+ years, then someone works on it, and it then fails ....... you need to assign responsibilty to something, or somebody, other than the design.

Do modern race cars use LH wheel fasteners?

[DaveW]

When an assembly works fine for 20+ years, then someone works on it, and it then fails ....... you need to assign responsibility to something, or somebody, other than the design...

My thoughts exactly...

[Fred Michael]

When an assembly works fine for 20+ years, then someone works on it, and it then fails ....... you need to assign responsibilty to something, or somebody, other than the design.

Do modern race cars use LH wheel fasteners?

Only the wheel nuts. Certainly nothing that holds the stub axles in, it's just not necessary.

[ghickman]

I'm looking for a left hand thread M12 x 1.75 x 80mm bolt. I have tried Fastenal but they do not have and none of their suppliers stock them. Anyone know of a good source for metric / specialty bolts? Any help is appreciated!

Original post
Solution is McMaster Carr part number 91290A649. That is a 130mm length M12 x 1.75 SHCS. The thread is 36mm long.

So have it drop shipped to my machine shop and I will cut to 80MM long and thread it L/H 1.75mm pitch to whatever thread length you need. Pretty simple do it all the time.

$50 plus shipping.

[jchracer]

Original post
Solution is McMaster Carr part number 91290A649. That is a 130mm length M12 x 1.75 SHCS. The thread is 36mm long.

So have it drop shipped to my machine shop and I will cut to 80MM long and thread it L/H 1.75mm pitch to whatever thread length you need. Pretty simple do it all the time.

$50 plus shipping.

I'm not a fan of cut threads on a cyclic loaded critical application unless the loading is very low. ive seen too many fatigue failures. I'm assuming you don't have left handed metric thread rolling equipment.

[R. Pare]

You aren't going to thread roll an already hardened bolt without some very special equipment.

[Steve Demeter]

https://www.jegs.com/i/ARP/070/665-1...CABEgJNTfD_BwE

[problemchild]

You aren't going to thread roll an already hardened both without some very special equipment.

I think that was the point.