car jacks

[Ron P.]

I purchased these two car jacks at a flee market. I think one is a Model A
jack, but i have no idea what the other one is. They look very similar and are probably made by the same vendor. What's your guess?

[Bob C]

I don't think either one is Model A.

Bob

[figment]

I agree , both have the second stage screw that is not original Model A

[burner31]

Damn, I have one just like those

[NCRebel]

I think they are made by the same company (no knowledge whom) with wrench heads being the only difference.

[3.6rs]

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Since we are talking jacks here, what are these ?

[BILL WILLIAMSON]

Originally Posted by 3.6rs

Since we are talking jacks here, what are these ?

Dog here,
Those are JACKS, also
Buster T.

[burner31]

here's mine

[cjkohnast]

That dog has a good sense of hummor

[BILL WILLIAMSON]

Originally Posted by cjkohnast

That dog has a good sense of hummor

CJ,
You should see STRANGE, FUNNY things he does here He does things I don't even TRY to understand???? "Maybe" it's his WILD DOG Genes showing up! He has about 7 ancestors, in his make up, including 2 Greyhound type Dogs
Google: "Rat Terrier History" & you'll be AMAZED!
Bill Dogslave

[JRShaw]

Originally Posted by figment

I agree , both have the second stage screw that is not original Model A

Gentlemen: What are we talking about here? What exactly is a "second stage" for any jack? Have been around cars & machinery for a long time and have never heard this tem used in reference to a jack. Thank You in Advance.

[BILL WILLIAMSON]

Originally Posted by JRShaw

Gentlemen: What are we talking about here? What exactly is a "second stage" for any jack? Have been around cars & machinery for a long time and have never heard this tem used in reference to a jack. Thank You in Advance.

JR,
It's a SECOND screw that comes into play, that EXTENDS the HEIGHT
Bill Tall

[Keith True]

In a two stage jack the first screw goes up a certain amount,or until it bottoms out.Then,the second screw takes over and goes up some more.Like a forklift,the forks alone go up until the hit the top height of the machine.Then,the second stage piston takes over and goes up mast and all to the next stage.That's how you can pick up things 15 feet in the air with a machine that stands 6 feet tall.Same with a 2 or 3 stage jack.

[160B]

Here is the MAFCA web site information on jacks.

http://mafca.com/tqa_jacks.html

Also the RG&JS have 4 pages on jacks. RG&JS 17-4 through 17-7 revised 2016.

[160B]

The one jack on the Right in the first photo could be a C-2 if it has the correct dimensions, and if it has a single threaded drive screw (not a double internal-external screw).The one on the left is not a C-2 Jack, close but not totally correct.


See attached RG&JS page 17-6 Revised 2016.
Here is a link to the RG&JS very helpful.

https://mafca.com/cart/index.php?productID=115