Metric Bolts vs. USA Standard Bolts

FBH44 · Apr 7, 2019

I slightly buggered up the threads of a Metric 8.8 M12 front wheel bolt trying to re-install front wheel on my Massey. Found out that a fine-thread USA 1/2 inch Grade 8 bolt would thread in. It was a loose fit, and I didn't trust it, but it is in there, tight, I guess. Will that be OK? I cannot seem to find Metric Grade 8.8 M12 taper-cone wheel bolts. Every place I seem to find that advertises them, in the fine print it says 1/2-Inch UNF, which isn't metric.

LAA · Apr 7, 2019

If you have a local tire place that does tractor and equipment tires they should have them, I know NAPA can get them where I live because that size metric bolt is fairly common to many different implements and tractors.

caterpillar guy · Apr 7, 2019

Probably wind up going to agco and the long price.

Jim.ME · Apr 7, 2019

Dorman Products shows a number of metric lug bolts on line, there should be something there that will fit. NAPA or any parts store handling Dorman Products should be able to get them.

flying belgian · Apr 7, 2019

Yes, that will be ok. But it is not doing anything. It is just in there for looks. Keep the other five tight and you will be ok. Myself, I just cannot rest if my equip. is not perfect. I am a perfectionist and ok is not good enough for me.

rvirgil_KS · Apr 7, 2019

If bolt threads through the hub can you get a longer one and put a nut on the back?

Janicholson · Apr 7, 2019

Tire stores should be a first choice. NAPA, Value Auto and the like are also good sources. Metric is now common. Jim

buickanddeere · Apr 7, 2019

showcrop · Apr 7, 2019

McMaster Car

Brendon-KS · Apr 7, 2019

An M12 threaded hole has a minor diameter of only about 10mm. If you could loosely turn a 1/2" bolt (which is 12.7mm diameter) into the hole I'm guessing you actually have M14 lug bolts which is a common size.

Traditional Farmer · Apr 7, 2019

Then Fastenal

gene bender · Apr 7, 2019

UNF is more threads than NF or NC

Bob · Apr 7, 2019

Here's a list of what's available through your local DEERE dealer, if you don't have any luck finding them elsewhere.
If the LVU23280 will work, only $1.96! If you order and can wait a couple of days so they can get them on a stock order there shouldn't be a freight charge.
BTW, they are showing the thread diameter as 0.472", sure close to the 1/2" you mention.

<img src = "https://i.imgur.com/rtoRkTJ.jpg">

Bob · Apr 7, 2019

(quoted from post at 15:43:05 04/07/19) UNF is more threads than NF or NC

WRONG, Gene.

2510Paul · Apr 7, 2019

I suggest you call Agri-Supply. I had a similar problem, might be identical problem, on a Massey and they had the wheel bolt.

https://www.agrisupply.com/?eid=gl020116&sid=google&gclid=EAIaIQobChMI6M2drvy-4QIVibbACh0bvgYuEAAYASAAEgKnkvD_BwE

Paul

Spook · Apr 7, 2019

I just bought some metric bolts, m12x1.75. There is a m12x1.5 also. Fastenal has pretty much everything.

Russ from MN · Apr 7, 2019

No, it will not be OK, don't tighten it or you will ruin the threads in the hub. You should be able to buy metric bolts at any good farm supply or hardware store, or auto parts. Auto parts stores might even have the tapered head bolts.

SVcummins · Apr 7, 2019

It won?t work . What you could do is run the bolt through the hub and put a nut behind the hub that would work good

SVcummins · Apr 7, 2019

A half inch national coarse might be just big enough if you re thread the hole to grab .

timcasbolt · Apr 7, 2019

(quoted from post at 00:20:24 04/08/19) A half inch national coarse might be just big enough if you re thread the hole to grab .

That would be a terrible idea. A 1/2" bolt is only .028" bigger than 12mm.

Russ from MN · Apr 7, 2019

I just did the math too, and I agree with the .028 bigger, so if the 1/2 is in there the threads must be shot already?

timcasbolt · Apr 7, 2019

(quoted from post at 03:42:38 04/08/19) I just did the math too, and I agree with the .028 bigger, so if the 1/2 is in there the threads must be shot already?

Agreed. Time for a serious repair solution. I have helicoils, but timeserts are better.

Metric Bolts vs. USA Standard Bolts

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