Simplex 5/8" thread pitch?

[bladeracer]

Anybody know the thread pitch of Simplex 5?8" dies? I_think_ it's 27tpi?
I really don't want to spend $60 or more for a thread adaptor if I can avoid it.
I'd rather drill a hole through a $5 7/8" bolt and run a tap through it.

[No1Mk3]

G'day bladeracer,
From memory the Simplex 5/8th is 26TPI (5/8 BSCy),

[Jorlcrin]

Thought I still had a couple of Super Simplex dies that I could read for the thread pitch for bladeracer, but turns out they are hiding well...

Interesting that they used British Standard Cycle thread for the 5/8" dies.
I did find a web page that had thread pitch info for the BSCy thread:-
https://britishfasteners.com/threads-bsc

[bladeracer]

G'day bladeracer,
From memory the Simplex 5/8th is 26TPI (5/8 BSCy),

Thanks for this, I guess I'll have tons of fun trying to find a tap for that one

[bladeracer]

Thought I still had a couple of Super Simplex dies that I could read for the thread pitch for bladeracer, but turns out they are hiding well...

Interesting that they used British Standard Cycle thread for the 5/8" dies.
I did find a web page that had thread pitch info for the BSCy thread:-
https://britishfasteners.com/threads-bsc

My thread gauges are up in my office so I just counted by eyeball. I figured being Simplex it wasn't going to be something standard

[Wm.Traynor]

I have some 5/8" dies. Do you know how hard it is to count threads using your caliper depth rod, while your eyes are as bad as mine?
To put you out of your misery, it looks like 20tpi. The method employed was to roll the threaded body agaist a piece of white cardboard, leaving the thread imprinted thereon. holding that agaist the caliper extended to 1/4", I could count 5, making 20 for an inch.
Hope this helps.

[bladeracer]

I have some 5/8" dies. Do you know how hard it is to count threads using your caliper depth rod, while your eyes are as bad as mine?
To put you out of your misery, it looks like 20tpi. The method employed was to roll the threaded body against a piece of white cardboard, leaving the thread imprinted thereon. holding that against the caliper extended to 1/4", I could count 5, making 20 for an inch.
Hope this helps.

I did similar. Laid it against a tape and put the locking ring at about 25.5mm, then took a photo and counted
I got somewhere around 25 or 26, not very helpful as 24tpi would be muzzle thread which I have taps and dies for, and 27tpi would be the next larger common thread. I figure they must have done it to force the poor customer that has bought their dies to have to spend another $60 on the adapter or consider buying a complete press from them, both of which choices are unpalatable for most people that have just bought dies they can't use. I actually knew their dies were 5/8" but I just assumed they'd be packaged with an adapter, that would just be common sense. If I could find the adapter somewhere in stock it wouldn't be so bad

Major diameter of the dies is .618" or 15.7mm, so I'm considering just boring a 15mm hole in a pair of 7/8"-14tpi bolts and press the dies into them permanently. It's only a neck die and a seating die so there's no downward load on them as when pulling a sized case out of a FLS die. Or ignore them and go back to my original idea of using the .25ACP die to neck-size and the .303 die to bump the shoulders.

[Wm.Traynor]

Further to the above..................
For the last week I have been re-arranging things in my garage and things have gone from a shemozzle to a catastrophe But after writing the above I managed to extricate my old Super simplex and lo and behold, the die screwed wound in without a hitch, so 20 tpi it is.

However, if you have any doubts, I will get my work checked albeit, by my equally blind wife.

[bladeracer]

Further to the above..................
For the last week I have been re-arranging things in my garage and things have gone from a shemozzle to a catastrophe But after writing the above I managed to extricate my old Super simplex and lo and behold, the die screwed wound in without a hitch, so 20 tpi it is.

However, if you have any doubts, I will get my work checked albeit, by my equally blind wife.

Wow, that's bloody weird. 20tpi is a fairly coarse thread (roughly 1.25mm). Standard muzzle threads are 1/2"-28tpi (roughly .9mm) for small stuff and 5/8"-24tpi (roughly 1mm) for larger stuff. If you can get a good clear photo I can scale it against my photo to see if they're the same.

[Jorlcrin]

Hmmm...
Found this link for 5/8 x 20 UN thread:-

https://www.machiningdoctor.com/threadinfo/?tid=72

Now I'm kicking myself I cant find one of the dies to check for myself!

[niteowl]

Anybody know the thread pitch of Simplex 5?8" dies? I_think_ it's 27tpi?
I really don't want to spend $60 or more for a thread adaptor if I can avoid it.
I'd rather drill a hole through a $5 7/8" bolt and run a tap through it.

Make sure it is done dead square if you do ! eg on a lathe

[Wm.Traynor]

Further to the above..................
For the last week I have been re-arranging things in my garage and things have gone from a shemozzle to a catastrophe But after writing the above I managed to extricate my old Super simplex and lo and behold, the die screwed wound in without a hitch, so 20 tpi it is.

However, if you have any doubts, I will get my work checked albeit, by my equally blind wife.

Wow, that's bloody weird. 20tpi is a fairly coarse thread (roughly 1.25mm). Standard muzzle threads are 1/2"-28tpi (roughly .9mm) for small stuff and 5/8"-24tpi (roughly 1mm) for larger stuff. If you can get a good clear photo I can scale it against my photo to see if they're the same.

OK, I will get my wife's help now. Sorry; can't do pics and my wife is on the phone

[bladeracer]

Anybody know the thread pitch of Simplex 5?8" dies? I_think_ it's 27tpi?
I really don't want to spend $60 or more for a thread adaptor if I can avoid it.
I'd rather drill a hole through a $5 7/8" bolt and run a tap through it.

Make sure it is done dead square if you do ! eg on a lathe

Yep, on the lathe.

[Wm.Traynor]

OK, After compressing the die against the card in a vice, to leave a full inch impression I counted 27!

Very Sorry for the confusion.
In retrospect, using a 1/4" was a mistake and so was not getting my wife to help too

[bladeracer]

OK, After compressing the die against the card in a vice, to leave a full inch impression I counted 27!

Very Sorry for the confusion.
In retrospect, using a 1/4" was a mistake and so was not getting my wife to help too

Yeah, counting threads by eye rarely gets useful results

I'm still trying to find the adapter in stock somewhere but it's looking like I'm going to have to make something myself.

[Wyliecoyote]

Blade, the pitch is 26 TPI.

[bladeracer]

Blade, the pitch is 26 TPI.

Thanks Wylie.

[Blr243]

Regarding blades comments ILL HAVE FUN TRYING TO FIND A TAP FOR THAT ONE .. the other day I found I needed a 35 x1mm tap. Pretty bloody rare. Saw one on the internet. Rang half a doz companies. They all said your dreamin .. e entually a bloke rang me back but it was over 200 dollars plus gst. So I gave him my card details and it’s on its way. Rare stuff costs big bucks

[bladeracer]

Regarding blades comments ILL HAVE FUN TRYING TO FIND A TAP FOR THAT ONE .. the other day I found I needed a 35 x1mm tap. Pretty bloody rare. Saw one on the internet. Rang half a doz companies. They all said your dreamin .. eventually a bloke rang me back but it was over 200 dollars plus gst. So I gave him my card details and it’s on its way. Rare stuff costs big bucks

Yeah, odd ones get expensive. For that sort of money I'd probably try to make one first.

Been checking websites and making calls and not having any luck finding a Simplex adapter. If I could find a Simplex press cheap enough that would be another option.

[Blr243]

I used to have an old one. Not sure if I still have it. If I can find it , it’s yours. I’ll have a look under the house tomorrow in better light

[No1Mk3]

5/8th x 26TPI taps are still readily available, from $35 to $65 for a set of 3. If someone such as Blr243 can lend you one so much the better. Alternatively if you have a lathe to use don't bother with the tap and just have one screwcut.

[bladeracer]

5/8th x 26TPI taps are still readily available, from $35 to $65 for a set of 3. If someone such as Blr243 can lend you one so much the better. Alternatively if you have a lathe to use don't bother with the tap and just have one screwcut.

Thread cutting was something I didn't learn on the lathe in high school. I probably missed the day we were taught it so I never learned to do it properly and my handful of attempts haven't been especially good, so I prefer to use taps and dies on the lathe. I understand setting the lathe up to do it (must've been shown that on a different day, when I was there), but the quality of my results tend to be poor.

Rose's dad had a lathe here but when he died it went to the local Men's Shed, I might drop in on them this week and see if somebody there might be happy to run this thing off for me.

[bladeracer]

I used to have an old one. Not sure if I still have it. If I can find it , it’s yours. I’ll have a look under the house tomorrow in better light

That would be awesome, Blr!

[Blr243]

I just remembered. I hope I still have it. ( press). And by the way I can’t single point thread on a lathe either . Tried but no good. But I’m not going to give up either. I’ll get it one day

[bladeracer]

I just remembered. I hope I still have it. ( press). And by the way I can’t single point thread on a lathe either . Tried but no good. But I’m not going to give up either. I’ll get it one day

I mentioned to a mate that I was struggling to find the adapter and he found me one in NSW. So I've ordered one, despite the $87 cost - the die set was only $85.

Between getting back into pistol shooting and the improved weather window, we're flat out between attending shoots and putting in seedlings with Landcare. If I have to to make the adapter myself it's going to be down the priorities list so I figured spending the money sorts it out for me

Taps and dies allow me to cut threads without the lathe so I just find them more useful. I have cut some threads on the lathe, and they did the job, but I could never offer them to somebody else