Mid Year Jack

[Mark L.]

Does anyone know a source for the 7/8 hex course thread nut that is welded to jack frame and into which the jack screw turns? My guess is that it is not a typical hardware store item. I'd like to replace the existing one as it is stripped. Thanks

[Dick W.]

Re: Mid Year Jack

Mark, it would be my guess that it is an Acme thread, either 8 or 10 threads per inch. If so you could purchase it from McMaster Carr or similar source. The Acme thread nuts and bolts are not readily available in your local hardware stores.

[Keith M.]

Re: Mid Year Jack

Mark, Have you given any thought of seeing if you can find a helicoil? I have never done this on the jack but I though I would bring it up and maybe someone would have a source for the helicol. Good luck and if you find the nut get two of them as I need one.

[John D.]

Re: Mid Year Jack

I have never heard of a heli coil for an acme thread. Metric and the usual but no acme. Never saw it in my catalogs but that doesn't mean it doesn't exist. Maybe others know differently. If all else fails the nut could be made from hex bar stock. Then Mark can have some extras made and sell them and end up getting his for nothing. Once the lathe is set up you can knock out a ton in short order. There may be a market for some of these. I imagine others have the same problem as those jacks were not too swift. I used to carry a NAPA jack in my C2's as the generals jacks wouldn't take much punishment. I can remember my 66 jack bowed out.

[John D.]

Re: Mid Year Jack-Acme nuts

Mark, I checked my McMaster Carr catalog-#110 page 2985 and would you believe Dick W is correct. First time though.
General Purpose Acme Nuts-hex nuts.
The jack shaft is about 1/2 but you will have to double check. Quite a selection of widths, heights, and threads. Thread is either 1/2-8 or 1/2-10. Maybe Dick can tell you or someone else as I don't know. Anyhow there is 1/2-8, 1/2-10 in various metals. You want the plain steel or even the zinc-plated. Plain steel are less than 3.00 each. SS is expensive at around 10.00. Zinc-plated only comes in 1/2-10 7/8" wide and 1/2" height. Cost is around 7.00. You can go on line and get their web site as they aren't too free with catalogs unless you are in big business. Good luck, JOhn
P.S. I assume its a right hand thread. Be careful as they have left and right hand.

[Dick W.]

Re: Mid Year Jack-Acme nuts

FI Mark contacted me off board and the threads are 5 tpi. The only Acme thread at 5 tpi is 5/8". Check measurement of rod in jack. I am thinking that it is only 1/2"

[John D.]

Re: Mid Year Jack-Acme nuts

Dick, The acme threaded rod in my 63 jack is 1/2". I used a mic and it's .500 +-. So your info is not good news my friend. I didn't see the 5 threads per inch listed. Just for other triva on jacks. The later judges like the C3's have a different configuration. Instead of a nut they have a type of threaded bar but the shaft is the same size.

[Dick W.]

Re: Mid Year Jack-Acme nuts

Mark sent me the dimensions of the bolt. I can have nuts made locally if need to. Have a couple of good shops that will take on small projects

[John D.]

Acme Nut 1/2-5 available

Mark, www.craftechind.com Phone 800-833-5130 for an Acme hex nut that is 1/2-5.

[John D.]

Re: Mid Year Jack-Acme nuts

Dick, That's good cause the repro one was not the correct dimensions. As you know the real deal is a very fat nut. Well tonite was not a good nite for sure. All those poor people that got killed and hurt when that bridge in Minn. fell 60 ft into the Mississippi. You just never know. John

[Philip C.]

Mark if you cant find any

e-mail me, Iam sure I have some. Phil 8063

[Mark L.]

Re: Acme Nut 1/2-5 available

What started out as a simple question (or so I thought) has turned out to be fairly involved. Thanks John, Dick and Phil for your assistance and generous offers. I will contact Craftechind and I also plan to contact Ausco, the original jack manufacturer. I beleive they also supplied the Mustang jack. I'll report back with more information.

[John D.]

Re: Acme Nut 1/2-5 available

Mark, I agree with you 100%. The most trivia question on this DB can result in a 100 posts. Lot os old timers like me bsing all the time.
I like Dick's suggestion the best though. Have his man make the nut to it's correct size. None of the replacements are the exact size but so what. The judges don't use digital micros as most of them can't read one. John

[Dick W.]

Re: Acme Nut 1/2-5 available

John, Mark, et al. The only thing listed at that web site is plastic!

[John D.]

I GIVE UP. SORRY> *NM*