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Old 06-30-2017, 07:26 PM   #1
Lawson Cox
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Default thread size on early Ford grease fitting

What size drill and tap size for early Ford grease fittings, 1/4 NPT?

Going to tap cap on steering box to install grease fitting so I can fill with John Deer corn head grease.

'bout done with horn repair. Should zip it up tomorrow.
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Old 06-30-2017, 07:49 PM   #2
woodiewagon46
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Default Re: thread size on early Ford grease fitting

Lawson, I believe you are looking for 1/8" pipe. The tap drill for 1/8' pipe is R drill (.399). If you are looking for 1/4" pipe the drill size is 7/16".
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Old 06-30-2017, 08:14 PM   #3
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Default Re: thread size on early Ford grease fitting

I think you'll find the plug in a steering box is something like 5/8 NF, not a regular pipe thread.
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Old 06-30-2017, 08:48 PM   #4
Lawson Cox
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Default Re: thread size on early Ford grease fitting

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Originally Posted by brian View Post
i think you'll find the plug in a steering box is something like 5/8 nf, not a regular pipe thread.
i am going to tap the stock cap for a grease fitting.
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Old 06-30-2017, 08:51 PM   #5
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Default Re: thread size on early Ford grease fitting

Quote:
Originally Posted by woodiewagon46 View Post
Lawson, I believe you are looking for 1/8" pipe. The tap drill for 1/8' pipe is R drill (.399). If you are looking for 1/4" pipe the drill size is 7/16".
Thanks. That's what I thought. Just looking for confirmation.
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Old 06-30-2017, 09:02 PM   #6
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Default Re: thread size on early Ford grease fitting

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Woodiewagon46 ,I think you made a typo. An R drill is .339.

Lawson, a 11/32 drill is .005 larger than the R drill.
Try it on a test piece and tap a little at a time until the grease
fitting is at the desired depth.
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Old 06-30-2017, 09:15 PM   #7
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Default Re: thread size on early Ford grease fitting

The original cap is only a pressed tin affair, I suspect that if you put a tap through it, there'll be insufficient threads for a grease zerk to hold. Hence, suggest you find a 5/8 bolt.
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Old 07-01-2017, 09:00 AM   #8
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Default Re: thread size on early Ford grease fitting

ford35, yes, you are correct, thats why I failed math, thanks!
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Old 07-01-2017, 07:57 PM   #9
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Default Re: thread size on early Ford grease fitting

I just use a 1 1/2" long needle grease gun tip to pump JDCH grease into the steering box. The needle allows you to get the grease into the tight spaces.
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