thread size and pitch, JD750 steering column nut?

swelltimes · Apr 16, 2019

I buggered the first couple of threads on the steering column of my JD750 tractor while removing the steering wheel.

I'm pretty sure, based on the thread-pitch gauges at the hardware store, that the nut that holds the steering wheel in place is 7/16 x 20.

Before I spend $30 on a rethreading die, I'm hoping to get confirmation that 7/16 x 20 is indeed the correct size. I can't seem to find that in print anywhere I've searched.

Can anyone confirm?

Thanks!

Zebrafive · Apr 16, 2019

JD parts says the nut is NLA (No Longer Available) so I can't confirm from the P/N, specs are no longer listed

If the hardware store has fine thread bolts, I would see if a 7/16-20 bolt fits the nut. If not, I would then try metric bolts. 12mm x 1.25mm pitch or 13mm x 1.25mm pitch. I am not sure if this tractor used both "inch" and Metric fasteners.

Another option instead of a die is a thread file. They are sized to the thread pitch.

Or you could just file away the first couple of bad threads.

ddbackhoe · Apr 16, 2019

swelltimes said:
I buggered the first couple of threads on the steering column of my JD750 tractor while removing the steering wheel.

I'm pretty sure, based on the thread-pitch gauges at the hardware store, that the nut that holds the steering wheel in place is 7/16 x 20.

Before I spend $30 on a rethreading die, I'm hoping to get confirmation that 7/16 x 20 is indeed the correct size. I can't seem to find that in print anywhere I've searched.

Can anyone confirm?

Thanks!

Know anyone that might have a thread repair tool? Threadmate, NES, etc.

https://www.homedepot.com/p/NES-5-3...xternal-Thread-Repair-Tool-NES06040/203544733

Agvg · Apr 16, 2019

If it's made outside US is allmost always metric.

swelltimes · Apr 16, 2019

OK, thanks for the info. I did try to file away the first couple of threads, and was getting close, but want to make sure I don't FUBAR the thing.

I'll head back to the HW store and try to confirm thread size with a bolt, as you suggested.

WranglerX · Apr 16, 2019

I have salvaged the day with using a very small triangle file and patiently working around the threads till its cleaned up enough to accept nut....

Dale

joecdeere · Apr 16, 2019

my old parts book says it's a 12mm, but doesn't give pitch

Agvg · Apr 16, 2019

Zebrafive said:
JD parts says the nut is NLA (No Longer Available) so I can't confirm from the P/N, specs are no longer listed

If the hardware store has fine thread bolts, I would see if a 7/16-20 bolt fits the nut. If not, I would then try metric bolts. 12mm x 1.25mm pitch or 13mm x 1.25mm pitch. I am not sure if this tractor used both "inch" and Metric fasteners.

Another option instead of a die is a thread file. They are sized to the thread pitch.

Or you could just file away the first couple of bad threads.

M13 bolt does not exist as a ordinary option for metric bolts.