Desparate need for Unisaw arbor nut

[Mark Evans]

My 36-L552 Type 3 Delta Machinery Unisaw did not come with the dado arbor nut as list in the manual. I didn't notice until I went to use my dado stack. Delta machinery has vanished and never answers calls or emails. Their part number is A2490S. It's right hand threads, but from what I can find out the TPI are not standard. None of the sources they list (eparts, erevoparts, etc.) has one. They all state: Discontinued by Manufacturer. McMasters-Carr hasn't gotten back to me yet, but they didn't have one on their site.

Can anyone help me? I've seen posts where a Frank S. makes them or has a source, but I can't locate him. And those posts were a several years old.
TIA
Mark

[Ray Newman]

Log on to Old Woodworking Machines and post your search in the "Bring Out Your Dead" classifieds.

https://www.owwm.org/

[Rick Potter]

This is the 'new' style Unisaw, right?

If I understand you, there is a separate nut for dado's as opposed to sawblades? Most cabinet saws I have seen use the same nut, but sometimes have to use it without the washer, which they say is ok. Personally, I use a flat 5/8" washer on my older Unisaw when dadoing.

If it is a separate nut, take the nut you have to a place that specializes in nuts and bolts (King Bolt in my area), and ask them to tell you what thread it is, and their advice.

OR...Call Grizzly parts dept. and see if they have one that fits. They carry a lot of parts for Asian saws.


PS: Welcome to the Creek. For six bucks you can be a contributor....well worth it.

[Mark Evans]

This is the 'new' style Unisaw, right?
If I understand you, there is a separate nut for dado's as opposed to sawblades? Most cabinet saws I have seen use the same nut, but sometimes have to use it without the washer, which they say is ok. Personally, I use a flat 5/8" washer on my older Unisaw when dadoing.
If it is a separate nut, take the nut you have to a place that specializes in nuts and bolts (King Bolt in my area), and ask them to tell you what thread it is, and their advice. OR...Call Grizzly parts dept. and see if they have one that fits. They carry a lot of parts for Asian saws.

Are you saying Delta Machinery are Asian Saws and similar to Grizzly? I was told they are made in Spartanburg, SC.
Anyway, yes, the "standard" blade nut has a very wide flange. Supposedly a dado will not work with this. See pics.

20231021_121105.jpg20231021_121111.jpg

[Mark Evans]

Log on to Old Woodworking Machines and post your search in the "Bring Out Your Dead" classifieds.
https://www.owwm.org/

This is not an old machine. Less than 2 years old bought new from lowe's.
I will try what you suggest. Thanks

[Thomas McCurnin]

Supposedly?

Mount your dado stack on the post and give this a try. It may not work will a full 3/4" stack due to the thickness of your arbor nut, but my guess is that it will work fine.

Also try eBay and get one of their Delta Unisaw arbor nuts, for $13 its worth a try.

[Jim Becker]

Are you saying Delta Machinery are Asian Saws and similar to Grizzly? I was told they are made in Spartanburg, SC.
Anyway, yes, the "standard" blade nut has a very wide flange. Supposedly a dado will not work with this. See pics.

In a subsequent post to this quote, you indicated the machine is only two years old. Delta branded machinery has not been made in the US for a very long time, AFAIK. It's not even the same company as it was "back in the day".

[Maurice Mcmurry]

Can you use the one you have upside down with no washer, or with a thin flat washer? My wobble dado won't fit on my Delta Homecraft saw with anything but a very thin homemade washer.

[Bill Dufour]

On the older unisaw it was 5/8-12. LH acme threads. I suppose it could have been buttress threads but I am pretty sure it is acme.
Bill D

[Tom M King]

A 5/8 lawnmower blade nut may work. I know there are several different threads available because I remember buying some that didn't fit that mower. With threads all the way to the end of that nut, it should work fine put on backwards.

[Richard Coers]

In a subsequent post to this quote, you indicated the machine is only two years old. Delta branded machinery has not been made in the US for a very long time, AFAIK. It's not even the same company as it was "back in the day".

Read this on Wikipedia; .^[1] Chang Type is moving Delta's production tooling from a Stanley Black & Decker owned facility in Jackson, Tennessee to a facility in Anderson County, South Carolina.

And from the Lowe's website; Where is this saw built?
Anonymous on December 28, 2019

Answer

The Unisaw is made in the USA using foreign and domestic components.

[Jim Becker]

Interesting, Richard. Who knew?

[John Kananis]

If I remember correctly, the "new" uni can take up to a 1" dado stack. How big are you going that the stock nut won't fit?

[Mark Evans]

If I remember correctly, the "new" uni can take up to a 1" dado stack. How big are you going that the stock nut won't fit?

The way the large flange is attached to the nut, it takes up a lot of room. The nut spins on the flange and is not removeable.
Unisaw_Flange_Nut.jpg

[Mark Evans]

On the older unisaw it was 5/8-12. LH acme threads. I suppose it could have been buttress threads but I am pretty sure it is acme.
Bill D

I believe you are correct, but even McMaster-Carr doesn't have a 5/8-12 LH. And I need RH thread