10-32 UNF Threaded Rod

I think the holes in the plate are towards the tighter end of the thread specifications, as an M5 screw only goes in about a turn and a bit before binding up.

Given the price of the Sherline accessories, I would expect this, though!

Have you asked Sherline by phone or email if they would have mercy and drop 50 cents worth of these assorted #10-32 studs in an envelope and mail it to you? Might be worth a try.

If you're still stuck, I'd be glad to give you a few assorted bits of studding if you would pay the postage. I can check what that would cost next time I'm at the post office here in Waterloo Ontario Canada.

Another thought- you might be able to find some fully threaded #10-32 screws locally (or at least in the UK) which you could cut the heads off to make studs. Probably won't find fully threaded 4" ones but you can probably find some shorter ones. These could be brazed to unthreaded 5 mm shanks for longer ones if you don't want to invest in a #10-32 die.

By the way, a #10-32 die will thread onto 5mm rod perfectly. If it were me, I'd get a die and make all the studs I need, cheaply and probably in an evening.

A die on ebay or in used tool/machine stores would probably not set you back much.

Just my $0.02 worth. JD

This is a 10-32 thread? I ask, because within the small UN series, #10 is somewhat oddball.

The common (everyday use) of small UN sizes (at least here in North America) are even numbers and coarse (UNC) thread.

Thus

#2-56 (rather than #2-64)
#4-40 (rather than #4-48)
#6-32 (rather than #6-40)
#8-32 (rather than #8-36)

This also follows for #10 .... #10-24 UNC being the more commonly found but in this case, the UNF thread is, while probably not equally common, reasonably common nonetheless. It's just not usually selected at the design stage unless there are good reasons which dictate the use of the fine thread.

Moreover all the #10-32 and M5-0.8 hardware that I have on hand (quite a bit actually) goes together easily either way round (by finger pressure, Michael - I'd assumed anyone here wouldn't get heavy with it).... not that any of them are UNC Class-3 threads but then, I don't see why Sherline would have used Class-3 threads for something like this either.

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I can't speak for Sherline, but I have certainly used quite a lot of 10-32 fixings ... typically on Defence equipment, and on the standard mounting threads for [vibration test] accelerometers.

As previously mentioned, the last few seconds of the video that I linked clearly show one insert that was pulled out by attempting to use a tight-fitting M5 screw in a [presumably good] 10-32 thread ... yet the early part of the video demonstrates how easily another insert in the same item was re-tapped to M5.

With due respect to your suppliers ... May I suggest that you check the actual dimensions of your M5 threads?

Returning to Sherline: Given that these are small fixings on a milling table, I would hope and expect them to be a good class of fit; exactly as our OP has found.

MichaelG. . [UK]

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P.S.  -- Although the choice of 10-32 into Aluminiun Alloy may raise the odd eyebrow; bear in mind that the root diameter of a 10-32 male thread is usefully greater than a 10-24 [and is quite 'safe' in a decent grade of alloy]

Edited By Michael Gilligan on 08/07/2015 22:28:56

Edited By Michael Gilligan on 08/07/2015 22:48:19

If you are making fairly long lengths of thread it is worth either screwcutting and finishing with a die, or making a die holder to fit in the toolpost and driving it along at 32 tpi. Just cutting with a die is prone to pitch error, doesn't matter for short lengths, but can be problem with deep tapped holes. Once you've made the holder it makes the job easier, and you have it for next time

.... yet quite unnecessary. It might go some way towards explaining Sherline's prices though And it certainly won't be a Class-3 on the original hardware after running an M5 tap through. If it were me, that would be the last resort. Before that, I'd run a regular #10-32 tap through and try the fit again.

> P.S. -- Although the choice of 10-32 into Aluminiun Alloy may raise the odd eyebrow ....

Not by me .... do it all the time.

Sherline use #10-32 for T-nuts and their milling table accessories, just to confirm.

Many of their machine table and way parts are T6061 aluminum alloy at T6 temper. JD

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Well, of course not ... I only ever suggested running an M5 tap through because Anthony was unable to find 10-32 studding at a reasonable price.

My first suggestion [and my prefrerred solution] was to use a decent 10-32 die to re-size some readily available M5 studding.

It is not really worth pursuing this discussion any further.

MichaelG.

Edited By Michael Gilligan on 09/07/2015 06:51:02

In NZ at least 10-32 taps and dies are sometimes marked 1/16 UNF for those who wonder about the 10-32 .

Ian S C

Hi Ian, I think 3/16 UNF is 10-32. 10-32UNF was common on Austin Morris cars when they went unified before they were metricated in the 70s. I think it was used to replace 2BA

Mike