Oddball Automotive Fitting

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Deaf Hawkeye
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Oddball Automotive Fitting

Post by Deaf Hawkeye » Thu Jan 20, 2022 1:58 pm

I have a fitting coming out of a HydroMax brake booster that I'm modifying for forklift use. The fitting is 13/16 x 18 threads per inch, similar to O-Ring Boss fitting, but with smaller O-ring. I'm not dead sure this was a now-hardened O ring or some teflon ring. Weird.

Has anyone else seen this size before? I'm wanting to adapt it to be JIC -6. Probably just going to get a JIC/ORB fitting and thread it to this size on the ORB end and go on, but if there's something readily available, I'm not into reinventing commercially available stuff.

Mainly just curious that this is a size I'm not even finding on Google.

Richard

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warmstrong1955
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Re: Oddball Automotive Fitting

Post by warmstrong1955 » Thu Jan 20, 2022 2:27 pm

Could it be M22-1.5?
Fitting Identifier.pdf
(314.24 KiB) Downloaded 134 times
See page 22.

Other Bill
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Deaf Hawkeye
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Re: Oddball Automotive Fitting

Post by Deaf Hawkeye » Thu Jan 20, 2022 4:30 pm

Good work, and very close, but it's sadly not that size. It's 13/16 x 18 tpi. I screwed a nut for compression fitting used on air brakes, fits perfectly.

I'll probably use said nut for a gauge when I go ahead and modify this JIC x ORB fitting. Thanks for the helpful info

Richard

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warmstrong1955
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Re: Oddball Automotive Fitting

Post by warmstrong1955 » Thu Jan 20, 2022 4:57 pm

From the automotive minds of Bosch.....an o-ring port with flare nut threads. Maybe schnapps was involved. I've never seen that before.

You called it right. Oddball! :)

That's a handy booklet, and I don't think it's on the website anymore.

Other Bill
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Deaf Hawkeye
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Re: Oddball Automotive Fitting

Post by Deaf Hawkeye » Fri Jan 21, 2022 1:04 pm

You're saying there's a Bosch thread handbook?

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liveaboard
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Re: Oddball Automotive Fitting

Post by liveaboard » Fri Jan 21, 2022 1:13 pm

There is or was a "Bosch automotive handbook", I once had a copy.
Very useful.

Russ Hanscom
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Re: Oddball Automotive Fitting

Post by Russ Hanscom » Fri Jan 21, 2022 1:25 pm

still out there, check ebay.

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warmstrong1955
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Re: Oddball Automotive Fitting

Post by warmstrong1955 » Fri Jan 21, 2022 2:07 pm

I was talking about Hydromax being a Bosch owned creature, although I don't know if it still is. Bosch has been known to do some odd things when it comes to hydraulic adapter threads.

I have a Bosch Automotive Handbook. 2nd edition, circa 1986. Not much on threads in there, a bit on fasteners & even less about pipe.
I have an SAE Hose & fitting Standards Book, which includes adapters. A heaping collection of various SAE standards taht Aeroquip put together. If you are after thread info, that's the one to get. Very useful. I haven't gone thru it yet, to find your 13/16-18 ORB fitting yet.
I'll letcha know if I find anything, other than flared tubing connector & nut.

Other Bill
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warmstrong1955
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Re: Oddball Automotive Fitting

Post by warmstrong1955 » Fri Jan 21, 2022 2:57 pm

Since I am watching paint dry......only things I see in the book with 13/16-18 threads, are flare & compression fittings. (SAE J246) all those threads are for the sleeve or compression nut......nothing with an o-ring.

Here's a Hydromax book I found on the inter-web.

http://1999southwind.com/DOWNLOAD/Bosch ... Manual.pdf

Page 17 shows the inlet, with a check valve an an internal tube o-ring, but not anything boss style. It's a mystery.

Schnapps! :)

Other Bill
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Deaf Hawkeye
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Re: Oddball Automotive Fitting

Post by Deaf Hawkeye » Fri Jan 21, 2022 4:22 pm

Bill,

Mine is the "other" Hydromax, mainly used on International and a few GM P30 Snap On trucks. Way simpler. That one in your link is the one usually found on Ford trucks.

Richard

Deaf Hawkeye
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Re: Oddball Automotive Fitting

Post by Deaf Hawkeye » Fri Jan 21, 2022 4:28 pm

liveaboard wrote:
Fri Jan 21, 2022 1:13 pm
There is or was a "Bosch automotive handbook", I once had a copy.
Very useful.
Just eBayed me one! It was in a package deal with two Bosch electrical and brake books!

Thanks

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warmstrong1955
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Re: Oddball Automotive Fitting

Post by warmstrong1955 » Sat Jan 22, 2022 9:04 am

Deaf Hawkeye wrote:
Fri Jan 21, 2022 4:22 pm
Bill,

Mine is the "other" Hydromax, mainly used on International and a few GM P30 Snap On trucks. Way simpler. That one in your link is the one usually found on Ford trucks.

Richard
That was the only real info that popped up when I did a quick search.

My guess is the 13/16-18 thread is something common for power steering hose connections. I have SAE J188 & J189, but both only cover hose, not any adaptors or fittings.

Other Bill
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