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Ramjet47 10-14-2020 04:18 PM

11-A Distributor Thread Size
 

I have a stripped thread on a distributor I am overhauling. What is the thread size of the vacuum connection?

Mart 10-14-2020 04:23 PM

Re: 11-A Distributor Thread Size
 

3/8 -24 UNF. 99% sure can anyone confirm?

rockfla 10-15-2020 07:29 AM

Re: 11-A Distributor Thread Size
 

NO expert BUT being a brass fitting/tube wouldn't it be a "NPT" or a National Pipe Thread because "Machine" threads do not "seal" so you couldn't seal the "vacuum" with a machine thread!!! MY "guess" would be a 1/8th NPT or 1/8 National Tapered Pipe Thread!!! AS I said....MY GUESS

Mart 10-15-2020 07:41 AM

Re: 11-A Distributor Thread Size
 

Rock, no, mate, I just went and checked, it is the fitting for a 3/16 tube, which is 3/8-24 UNF.

A 3/8-24 tap screws in nicely but a 1/8 NPT barely starts and goes tight straight away.

It was late when I posted last night, but was able to do a physical check today.

The nut has a tapered end which bites into the pipe.

Mart.

Mart 10-15-2020 07:43 AM

Re: 11-A Distributor Thread Size
 

If you've stripped it, you could go 1/8 NPT and use an adaptor to get back to 3/16 tube.

rockfla 10-15-2020 07:45 AM

Re: 11-A Distributor Thread Size
 

Damn bad day IF you don't "Learn something" everyday!!!! Good day, today!!! Thanks Mart

deuce lover 10-15-2020 07:51 AM

Re: 11-A Distributor Thread Size
 

1 Attachment(s)
Here is the fitting it takes I think.3/8 24 as Mart said

JM 35 Sedan 10-15-2020 08:01 AM

Re: 11-A Distributor Thread Size
 

Quote:

Originally Posted by rockfla (Post 1941759)
NO expert BUT being a brass fitting/tube wouldn't it be a "NPT" or a National Pipe Thread because "Machine" threads do not "seal" so you couldn't seal the "vacuum" with a machine thread!!! MY "guess" would be a 1/8th NPT or 1/8 National Tapered Pipe Thread!!! AS I said....MY GUESS

The sealing required at this fitting would not be accomplished at/or by the 3/8-24 threads.

JSeery 10-15-2020 08:28 AM

Re: 11-A Distributor Thread Size
 

Quote:

Originally Posted by Mart (Post 1941769)
If you've stripped it, you could go 1/8 NPT and use an adaptor to get back to 3/16 tube.

Mart, wouldn't any adapter require a provision to seal the original 3/16 fitting. I think it is going to require some measure to repair the existing threads or switching to some other method to seal the 3/16 tube with the adapter. Unless there is an adapter that provides the seat required for the original fitting.

rotorwrench 10-15-2020 10:51 AM

Re: 11-A Distributor Thread Size
 

That was Ford's original compression fitting that was used clear up into the 60s at least.

tubman 10-15-2020 11:42 AM

Re: 11-A Distributor Thread Size
 

I've always known them as "Ford Nuts".:)

JSeery 10-15-2020 11:59 AM

Re: 11-A Distributor Thread Size
 

Ya, I would really think hard about any attempt to tap it out to a different size, could really open up a can of worms.

supereal 10-15-2020 12:55 PM

Re: 11-A Distributor Thread Size
 

Ford used a lot of unusual thread sizes and pitches. At our shop we aways save any "left over" nuts and bolts. We have several coffee cans of them, and have been glad we did.

Ramjet47 11-08-2020 04:15 PM

Re: 11-A Distributor Thread Size
 

Thank you to all who replied. I have now re cut the thread back to 3/8”x24 UNF, not perfect but with thread sealant it will be OK. Best regards Roger.


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