Looking for a source of .595-32 tap set and possibly die

[Tokarev]

Any idea where I can buy those?

[John Taylor]

You could most likely get a custom made from MSC. I made my own .600X24 die for model 61 Winchester barrels.

[deltaenterprizes]

Try Pacific Tool and Guage.

[Tokarev]

You could most likely get a custom made from MSC. I made my own .600X24 die for model 61 Winchester barrels.

John:

What's MSC?

Pardon my ignorance!

[Roger Ronas]

MSC = Manhattan Supply Company

www.mscdirect.com


HTH
Roger

[Mooseman]

Thats a tough one...Its the threads on an M1A flashhider. Not many places sell just that tap...I would Call Brownells.
Here is a place that makes the couplers/ adapters...http://www.muzzlecouplingsonline.com/other-items/thread-adapters---custom
Rich

[Tokarev]

Is the thread on the gas port section of M14 barrel same size?

I wonder if .595-32 is the same size as 19/32-32.
Then http://www.toolsavings.com/default.aspx?page=Item%20Search%20Results would have them.

[John Taylor]

John:

What's MSC?

Pardon my ignorance!

http://www1.mscdirect.com/cgi/nnsrhm

[tbhutton]

19/32 is 0.59375, not 0.595. However, the realities of tapping is that if the tap is not in a jig to hold it absolutely steady, the resulting threaded hole is probably going to be slightly larger than intended. I would almost bet that a 19/32-32 tap would work.

[tbhutton]

Oh, and I would try Western Tap, they have lots of odd sizes.

http://www.westerntap.com

[Tokarev]

19/32 is 0.59375, not 0.595. However, the realities of tapping is that if the tap is not in a jig to hold it absolutely steady, the resulting threaded hole is probably going to be slightly larger than intended. I would almost bet that a 19/32-32 tap would work.

That could help a tight fit of the muzzle break on the barrel thread too.

[W.R.Buchanan]

The 19/32 x 32 is in fact what you're looking for. The minor descrepancies are negligable.

MSC is more likely to have that tap than just about any one, and the price will be very reasonable..

I once ordered a 1 3/16 -18 from them, which is a total and complete bastard size tap.

They asked if I wanted a taper, plug or bottom tap as they had all of them in stock.

I asked how many they had in stock?

They told me 45+ in each configuration!

They probably have that many 19/32-32 's also!

Randy

[Tokarev]

What is the drill diameter for .595 or 19/32-32tpi thread? Can't seem to find data anywhere.

[Norbrat]

Assuming it's a UNF profile, 60° thread form, you basically subtract the pitch of the thread from the nominal outer diameter.

So in this case, as the pitch is 32 tpi, 1/32" per thread, so 19/32 - 1/32 = 18/32, or 9/16.

That's fine for that diameter! I'd try it in a test piece before I committed myself to the real thing.

[Tokarev]

All genius solutions are simple!
Just a question: should 1/32 be subtracted twice, for each of the radii, arriving at 17/32 hole?

Which in turn would mean that drilling with 0.5" bit and tapping that thread would suffice.

[John Taylor]

All genius solutions are simple!
Just a question: should 1/32 be subtracted twice, for each of the radii, arriving at 17/32 hole?

Which in turn would mean that drilling with 0.5" bit and tapping that thread would suffice.

The 1/32" measurement would be slanted at 30 degrees for the "V" thread. This will give about a 75% thread engagement which will be plenty strong enough. If you went to 1/16" undersize you would not be able to tap the hole with a standard tap. I have used the pitch measurement for many years as a standard for measuring the reduction in hole size and it work good.

[Norbrat]

UN and Metric threads have indentical thread forms.

Metric thread tables show the tapping drill size to be exactly nom diameter minus pitch; eg, M12 x 1.5 shows a tapping drill size of 10.5mm.

UNF is the same, say 3/4 x 16, tapping drill size is shown as 11/16"; 3/4 (12/16) - 1/16 = 11/16

Sorry, won't go near BSW or BSF with their 55° included angle, or even worse, British Standard Cycle or Cycle Engineers Institute threads; what a mess they can be! :veryconfu

[Tokarev]

Initially I thought 'what a genius designed thread for M14 hider - every shop has 1/2" drill bit'
But now it is sounding rather insane to me. What tool is going to drill a hole for threading a hider? It would have to be lathe bored. Yikes...

[kend]

Tokarev, did you find a tap?

[Tokarev]

Yes, had a handful of them custom made.

[Tokarev]

Now I am having a problem. The tapped thread does not want to thread onto M14 barrel - too tight. Dunno what I am doing wrong yet.

Threaded a short piece of aluminum stock with that tap and it was very tight too. After threading it all the way onto M14 muzzle attachment threads there are lots of aluminum shavings in the lugs. The barrel essentially expanded the thread by a couple thou from the looks of it. However I cannot thread the original castle nut onto the tap, which is very surprising.

Does it look like 19/32-32 tap is too small for 0.595 thread?

[Chicken Thief]

http://www.tap-die.com/
http://www.victornet.com/index.html
http://www.tracytools.com/index.php?route=product/category&path=1

Maybe something here?

Coule it be thet the thread on the M14 is rolled on and slightly large?
Maybe chase the thread with a die and make them fit each other?

[Tokarev]

Barrel thread does look very rounded, the minor could be oversize. It's a made in China barrel after all.

I used an olden days method of enlarging the thread running a tap as a boring tool - pressing on the tap sideways with a lever with the part in the chuck.
After boring out quite a bit and getting substantial play of the tap in the threads it finally threaded smoothly onto the barrel.