Projects 1/4-18 thread. 100 years old

Yes you read that right, 1/4-18 thread.
No not 1/4-20- no not 5/16-18

The original bolts have to stay. The nuts are square nuts, but they don't have to be. Just need a few nuts.

where the hell am I going to find that?

 

Tractor supply, Granger, McMaster Carr?
I think I have some, will have to check. How many do you need?

OOps. Just saw that you clarified its 18 threads and not 20. I donno.

 

Well that was easy!

 

https://www.grainger.com/product/DAYTON-Hex-Nut-23AU33
discontinued, will keep searching

 

Check with a gunsmith... They use a lot of odd-ball threads. You should be able to get a tap from a gunsmith supply, but don't expect it to be cheap.

 

What are they off of? Maybe I can rob some from my A for ya?

 

How many do you need and how long?

Not gonna make any promises nut I have a coffee can full of nuts & bolts from my granddad's old home place,if I can help I will. HRP

 

MSC definitely has the taps: http://www.mscdirect.com/browse/tn/...e-Taps?searchterm=1/4-18+tap&navid=4287643437

So you can adapt whatever. With more digging, they likely have the nuts in there somewhere...searching is not very convenient! I know they have been able to supply taps and fasteners I've needed for some of the oddities on early Fords.

 

If they are square nuts some square stock and a tap is probably all that is needed.

 

Danny, just need the nuts , 4 of them

 

I checked the page and didn't see 1/4-18 tap there. If you do see it there can you get the part # of the tap. Thanks.

 

1916 willys overland

 

https://drillsandcutters.com/1-4-18-hss-taper-tap/

 

Write the first review
MSC #: 04840195

Big Book #: 287
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Interstate - 1/4-18 UNS, H3, 4 Flute, Bright Finish, High Speed Steel, Straight Flute Standard Hand Tap - Plug Chamfer, Right Hand Thread, 2-1/2 Inch Overall Length, 3B Class of Fit
Brand:
Interstate
In Stock
Price:
$28.83 ea.
Qty:

 

As bad as the 12-24 that Ford used!

 

Interstate - 1/4-18 UNS, H3, 4 Flute, Bright Finish, High Speed Steel, Straight Flute Standard Hand Tap - Plug Chamfer, Right Hand Thread, 2-1/2 Inch Overall Length, 3B Class of Fit
Brand:
Interstate
In Stock
Price:
$28.83 ea.
Qty:Buy me the tap and I'll make you some nuts.

 

Interesting. What part is it for? Could you post a pic of this Overland? I have a '10 Overland and perhaps some where in my stuff I may have something that will work. I will also give a look in my tool box as I may have a tap in all the old stuff I inherited from gramps and dad.

 

Looks like they are used on some plumbing application as a nut on NPT threads.

Here's a plastic one.....Couldn't find a steel or brass, but there probably out there.
http://shop.kempcospec.com/Thru-Panel-Hex-Nut-1-4-18-NPSF-x-11-16-Hex-BN-KIG102-150-78BN.htm

 

Quarter inch pipe threads are quite a bit larger than quarter inch nuts 'n bolts. The 11/16" hex gives it away.

 

My 1919 Stanley has 18 threads per inch on everything. Even the 7/8 left hand rear hub nut is 18 TPI. When they made machine screws they didn't have to change the feed that way so they saved set up time.
No S.A.E. bunch back then. It was your own standard.
The left hand rear axle shaft nut was boogered up and http://www.e-taps.com/index.html made me one.
it was pricy but what is a guy to do.
Might try them and good luck

 

It's for the hinge screws, missing nuts on the drivers side

 

12-24 was still a regularly used thread before everything went metric, just not so much on cars. Small electric motors and generators/alternators used it a lot, electrical gear, and plumbing parts. Still regularly stocked at most better hardware suppliers.

 

Travers Tool has 1/4-18 taps for about $15 each in taper, plug, and bottoming chamfers.

http://www.travers.com/high-speed-steel-special-thread-taps-00-to-12/p/44625/#size=1/4"

Of course, most any of the machine shop suppliers are going to have a $10 to $12 minimum shipping charge on top of the price so that makes for 4 sorta expensive nuts. OTOH, as a machine shop owner, every time I need some oddball tool I'll likely never use again, I eventually learned its best to just buy the damn thing and get on with the job. Every time I'd start looking for some "cheaper solution", I would end up******** away enough time to have done the job 5 times, eventually buy the tool, and end up wasting even more time waiting for the tool I shoulda ordered 3 days ago to arrive.

If you do end up making the nuts, the tap drill for a 1/4-18 would be a #10. Any time you run into an oddball thread where the tap drill size may not be listed on standard charts, you can take the major diameter and subtract one thread pitch to get a tap drill size that will give you 65% to 70% thread depth. In this case, 1/4 minus 1/18 = .1944 so a #10 at .1935 is the closest choice.

 

Great thread. Locomobile and Rolls-Royce used their own hardware as well. Bob

 

Cross threads are better than no threads!

 

Lol