Power Steering Coupling Shaft

Today a package from Grainger arrived with my 5/16 – 18 lefthanded tap arrived.  That matches the threads on the motor that will drive the accessories.  Next time I need something from Grainger I think I will order it through NAPA and pay the 30% markup.  They charged me $13 to ship a 3 or 4 oz piece via USPS.

Regardless, I got the part and I think it worked out well.  I’ll have to power up the motor to find out for sure, and will try that out later.  Through the captions below I’ll describe the process to get from where I was to where I am.

I need the coupler on the left to have the threads of the nut in the middle.  The tap on the right should accomplish that.

I need the coupler on the left to have the threads of the nut in the middle. The tap on the right should accomplish that.

Part number of the tap.  It was left handed (reverse threaded) so I had to special order it.

Part number of the tap. It was left handed (reverse threaded) so I had to special order it.

Good news is that it fits.  I had no way to verify the thread pitch due to the reverse threads, except to try and count how many I saw in the 1/4" that was visible.

Good news is that it fits. I had no way to verify the thread pitch due to the reverse threads, except to try and count how many I saw in the 1/4

First I clamped it on my table and tried to run the tap through.

First I clamped it on my table and tried to run the tap through.

That didn't work.  I realized I should drill out the existing threads because they go the opposite way of the tap.

That didn

Done, drilled out to 1/4" since the opening is 5/16".

Done, drilled out to 1/4

The tap kept wiggling and was pretty hard to turn.  I flipped it upside down and used a 3/8" socket to turn the coupling instead.  I went about halfway through.

The tap kept wiggling and was pretty hard to turn. I flipped it upside down and used a 3/8

It fits on the shaft...

It fits on the shaft...

...and it works like this!

...and it works like this!

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