Need help ID'ing an arbor nut size

[txdm]

I have a free 1995-vintage ToolStar 10" chop/miter saw Model R255. This thing looks like a tank compared to the modern plastic models.

I'd like to use this as a chop saw for steel bar stock and save my newer one for wood chopping.

Anyway, The Arbor nut is gone from it, and I'd like to find a replacement. It dont know much about these, but I can tell its 5/8" and left-hand.

Is there a standardized thread pitch for these, or can someone help my determine the pitch I'm looking for from this picture?

Thanks

 

[454ragtop]

Toolstar sounds Asian, if that is the case it is most likely metric, 16MM. If that's the case, use the other side of your scale and read the pitch directly.

 

[KnurledNut]

Looks like 5/8-18 or M16x1.5

 

[WWheeler]

Looks like a standard thread, as opposed to an acme thread like a lot of arbors are, so in that respect you probably lucked out.

I'm guessing 5/8-18 LH just because that's pretty standard but others here might be better able to tell by looking at your pic.

Do you have the flange/collar/washer or do you need that too?

 

[txdm]

It's made in Taiwan. Here's what the mm side looks like. It's hard to tell, my guess is 1.5mm or 18 tpi... I

was hoping there's a standard.

 

[txdm]

I have the flange/collar.

 

[WWheeler]

I could be wrong but I think M16-1.5 and 5/8-18 are the same, or at least close enough.

I say that just because the threads on my Craftsman slide hammer (also sold under Gearwrench and OTC brands & probably others too - priced/compared them all and bought Craftsman because it was on sale) are listed as M16-1.5 in the spec sheet that came with it, as does GearWrench's I believe (or so I read in a review), but OTC lists theirs as 5/8-18, and regardless they all accept all the same standard 5/8-18 slide hammer attachments from all brands. I have a Matco slide hammer attachment and several OTC 5/8-18 attachments that I use on my supposedly M16-1.5 Craftsman.

 

[txdm]

Thanks for all the reply's yall. I'm going to take a guess that it's 5/8-18 and order one.

 

[Advan]

While you're at it, order a thread pitch gauge as well. They (obviously) come in supr handy around the shop, and the import ones are quite cheap!

 

[atthebeach]

While you're at it, order a thread pitch gauge as well. They (obviously) come in supr handy around the shop, and the import ones are quite cheap!

+1 Good advice!

 

[txdm]

5/8"-18 nut from amazon works perfectly. Thanks for the help everyone!